A system for removing sedimentary solids from a separator is provided. The separator is for separating components of well fluid produced by a well. The system includes an inlet for receiving motive fluid; a nozzle configured to introduce the motive fluid to the sedimentary solids in the separator, thereby fluidizing the sedimentary solids; and an outlet configured to allow the fluidized solids to exit the separator. The motive fluid includes well fluid produced from the well. A separator, method for removing sedimentary solids from a separator, and method of removing solids from well fluid produced by a well are also provided.
An apparatus for use in a downhole tool is provided. The apparatus includes a membrane configured to isolate an internal environment of the downhole tool from one or more further environments, internal and/or external to the downhole tool; and an electrical element configured to conduct an electrical current. The electrical element is positioned with respect to the membrane such that energy generated by the electrical current passing through the electrical element is incident on the membrane. The membrane is configured to be weakened and/or ruptured when the energy is incident thereon to allow fluid communication between the internal environment and the further environment.
A controller for use with a remote downhole tool is provided. The controller includes a processor and a transmitter for transmission of control signals to the remote downhole tool. The controller is configured for use at surface or uphole of the remote downhole tool to control transmission of data from the remote downhole tool. The controller is configured to transmit a control signal to the remote downhole tool to configure the remote downhole tool for transmission of data from the remote downhole tool according to a schedule or on demand. A communication system for use in a downhole environment is also provided. Methods of managing data transmission of a remote downhole tool are also provided.
E21B 47/12 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage
4.
WIRELESS COMMUNICATIONS WITH DOWNHOLE DEVICES USING COIL HOSE
An apparatus for providing communication with a downhole device positioned within a wellbore is provided. The apparatus includes a flexible hose configured to be run into the wellbore during a well intervention process and to provide a fluid communication path from surface into the wellbore. The flexible hose includes at least one communication medium forming at least part of an outer wall thereof. The apparatus further includes a downhole device for positioning within the wellbore and coupled to the communication medium for transference of a signal between the downhole device and the communication medium; and a surface communication unit for communicating data to the downhole device and/or receiving data from the downhole device, wherein the surface communication unit is coupled to the communication medium for transference of a signal between the surface communication unit and the communication medium.
E21B 17/20 - Tubes de forage flexibles ou articulés
E21B 47/14 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage utilisant des ondes acoustiques
E21B 47/13 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage par énergie électromagnétique, p.ex. gammes de fréquence radio
An apparatus for fitting to a wellbore, the apparatus including: a self-propelled downhole tool for deployment within the wellbore, and configured to propel itself along at least part of a length of the wellbore; and a lubricator for fitting to a wellhead of the wellbore via a valve system providing communication between the lubricator and the wellbore, and for housing the self-propelled downhole tool when in a stowed position, wherein the lubricator includes an input port for receiving data from a remote unit, the input port being in electrical communication with the self-propelled downhole tool when in the stowed position, and wherein the received data includes instructions for operating the self-propelled downhole tool, and associated self-propelled downhole tool, lubricator and method.
E21B 23/00 - Appareils pour déplacer, mettre en place, verrouiller, libérer ou retirer, les outils, les packers ou autres éléments dans les trous de forage
E21B 33/068 - Têtes de puits; Leur mise en place comportant des dispositions pour introduire des objets dans les puits ou pour les en retirer, ou pour y introduire des fluides
6.
Apparatus for Fitting to a Wellbore, Downhole Tool, Lubricator for Fitting to a Wellhead and Method of Transferring Power
An apparatus for fitting to a wellbore is provided. The apparatus includes a battery-powered downhole tool for deployment within the wellbore. The downhole tool includes a battery for providing electrical power to one or more components of the downhole tool. The apparatus further includes a lubricator for fitting to a wellhead of the wellbore via a valve system providing communication between the lubricator and the wellbore, and for housing the downhole tool when in a stowed position. The lubricator includes a transmitter for receiving electrical power from a remote power source, and for transferring received electrical power to a receiver. The downhole tool includes a receiver for providing electrical power to the battery, and for receiving electrical power from the transmitter. A method of transferring power from a transmitter of a lubricator to a receiver of a downhole tool is also provided.
E21B 33/068 - Têtes de puits; Leur mise en place comportant des dispositions pour introduire des objets dans les puits ou pour les en retirer, ou pour y introduire des fluides
E21B 44/02 - Commande automatique de l'avance de l'outil
7.
TUBING ASSEMBLY FOR USE IN WELLBORE AND METHOD OF RUNNING TUBING IN A WELLBORE
A tubing assembly for use in a wellbore is provided. The tubing assembly includes tubing configured to be run in a wellbore to recover downhole fluid from a formation; and at least one gauge positioned at least partially inside the tubing. The gauge is configured to detect a parameter inside the tubing.
E21B 47/12 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage
8.
METHOD AND APPARATUS FOR MONITORING LONG LENGTH TUBULAR STRUCTURES
A system and method of monitoring a tubular structure is provided. The method includes: a) sensing one or more parameters relating to the tubular structure at spaced apart positions along the length of the tubular structure using a sensor module array having a plurality of sensor modules disposed in a cable attached to the tubular structure, the plurality of sensor modules producing communication signals representative of the sensed parameter at each position along the length of the tubular structure; and b) using a control unit to communicate with the sensor modules in the array, including receiving communication signals representative of the sensed parameter at each position along the length of the tubular structure, and processing the communications signals to produce information relating to the sensed parameter at the positions along the length of the tubular structure.
G01M 5/00 - Examen de l'élasticité des structures ou ouvrages, p.ex. fléchissement de ponts ou d'ailes d'avions
G01P 15/18 - Mesure de l'accélération; Mesure de la décélération; Mesure des chocs, c. à d. d'une variation brusque de l'accélération dans plusieurs dimensions
9.
Valve assembly for controlling fluid communication along a well tubular
A valve assembly for controlling fluid communication along a well tubular that includes hydraulically operated valve that includes a valve member movable between open and closed positions, and a hydraulic actuator for moving the valve member; a control system for selectively controlling the flow of hydraulic fluid to and from the actuator; a vent chamber for selectively receiving hydraulic fluid exhausted from the actuator when the valve member is moved to its closed position; and a vent conduit for selectively receiving hydraulic fluid exhausted from the actuator when the valve member is moved to its closed position. The control system has a first valve closing state in which the vent chamber is isolated from the actuator. The control system has a second valve closing state in which fluid exhausted from the actuator during movement of the valve member to its closed position is vented into the vent chamber.
A downhole electrical power generation device is provided that includes at least one magnetic element, an electrically conductive element, and a member configured to be positioned within downhole fluid and to vibrate when the downhole fluid flows across a surface of the member. One of the magnetic element and the electrically conductive element is positioned on the member, and the other is configured to be positioned such that the electrically conductive element is located in a magnetic field produced by the at least one magnetic element to generate electrical power on vibration of the member. A method of generating electrical power downhole is further provided.
A tool for use in well tubing is provided. The tool substantially spans a diameter of well tubing. Alternatively or in addition the tool extends longitudinally in well tubing and has radially adjacent batteries. A method of using the tool in well tubing is further provided. The method comprises transferring a signal from the tool to another tool.
E21B 47/06 - Mesure de la température ou de la pression
E21B 47/13 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage par énergie électromagnétique, p.ex. gammes de fréquence radio
E21B 47/125 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage utilisant la terre comme conducteur électrique
12.
APPARATUS AND METHOD FOR CONTACTING AN OPEN HOLE SURFACE
An apparatus and method for contacting an open hole surface are provided. The apparatus includes an expandable portion surrounded by a contact portion configured to contact an open hole surface. The method includes expanding an expandable portion surrounded by a contact portion to create contact between the contact portion and an open hole surface.
E21B 47/125 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage utilisant la terre comme conducteur électrique
Valve assemblies are disclosed for use in the oil and gas industry. A disclosed valve assembly includes a housing having a bore; a valve member arranged within the housing which is movable relative to the bore between open and closed positions. The valve member includes a cutting feature and a sealing surface; a cutting component that cooperates with the cutting feature when the valve member is in moved to the closed position; a first seal element arranged within the housing and providing a first seal relative to the sealing surface; and a second seal element arranged within the housing and providing a second seal relative to the sealing surface. The second seal element is movable relative to the housing bore between first and second positions. A corresponding method of controlling communication along a bore of a housing is also disclosed.
E21B 34/10 - Aménagements des vannes pour les trous de forage ou pour les puits dans les puits actionnés par un fluide de commande provenant de l'extérieur du trou de forage
14.
POWER AND TELEMETRY SYSTEMS FOR A DOWNHOLE INSTRUMENT
A downhole instrument system for permitting continued operation a downhole instrument after one or more failure modes is provided. The downhole instrument system includes an electrical power supply in electrical communication with the downhole instrument via an electrical power connection comprising one or more lengths of electrical cable and one or more electrical cable terminations; a load monitor configured to monitor a load on the electrical power supply, wherein the monitored load is dependent on one or more failure modes related to the electrical power connection; and a power controller configured to control the electrical power supplied to the downhole instrument based on the monitored load.
E21B 47/13 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage par énergie électromagnétique, p.ex. gammes de fréquence radio
H02J 7/00 - Circuits pour la charge ou la dépolarisation des batteries ou pour alimenter des charges par des batteries
15.
SEPARATOR FOR SEPARATING CONSTITUENTS OF WELL FLUID, METHOD THERFOR AND SYSTEM FOR SEPARATING CONSTITUENTS OF WELL FLUID
A separator for separating constituents of well fluid produced by a well is provided. The separator includes a vessel for receiving well fluid such that a first fluid constituent overlies a second fluid constituent within the vessel, a collection pipe having an opening for collecting a first fluid constituent from the vessel, and a positioner connected to the collection pipe for rotating the collection pipe about an axis to adjust a height of the opening within well fluid in the vessel. A method and system are also provided.
A control system automatically operates a subsea well control device on detecting that a load in an Intervention Riser System (IRS) coupled to the subsea well control device has reached a threshold. The control system has a first control unit to detect that the load in the IRS has reached the threshold and a second control unit triggering actuation of the subsea well control device. The first control unit is in communication with the second control unit and issues an activation command to the second control unit to cause it to trigger actuation of the subsea well control device. The first control unit automatically issues the activation command to the second control unit upon detecting that the load in the IRS has reached the threshold, to trigger actuation of the subsea well control device prior to structural failure of an IRS.
A control system for automatically operating a well control device located in a subsea blow-out preventer (BOP), has a first control unit and a second control unit. The first control unit is connected to the second control unit and issues an activation command to the second control unit to cause it to trigger actuation of the well control device, and the first control unit is configured to automatically issue the activation command to the second control unit on detecting issue of the signal indicative of a requirement to trigger actuation of the subsea BOP shear mechanism.
A well bore instrument system is provided. The well bore instrument system includes a cable for conveying control signals and data signals; sensors positioned along the cable; and a controller operable to send control signals to the sensors and receive sensor data signals from the sensors via the cable. The controller is configured to transmit the control signals to the sensors at a control signal bit rate, wherein a sensor of the sensors is configured to receive the control signals and transmit sensor data signals to the controller at a sensor data bit rate, and wherein the sensor data bit rate is greater than the control signal bit rate.
E21B 47/12 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage
19.
METHOD AND APPARATUS FOR TRANSMITTING AN ELECTRICAL SIGNAL
A method of transmitting an electrical signal between a downhole device and a surface location is provided, the method including unwinding a flexible hose from a reel at the surface location and deploying the hose down a wellbore, wherein the downhole device is attached at a downhole end of the flexible hose, providing a conductive fluid inside the flexible hose as an electrical path, and transmitting the electrical signal through the conductive fluid from one of the downhole device and the surface location to the other of the downhole device and the surface location.
E21B 17/20 - Tubes de forage flexibles ou articulés
E21B 47/13 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage par énergie électromagnétique, p.ex. gammes de fréquence radio
A well bore fluid sensor is provided that includes an inner plate, a plurality of outer plates, first and second cable fixtures, and an electronics module. The inner plate defines a sensor interior cavity. The outer plates include a first outer plate and a second outer plate. The electronics module includes a resonant circuit and a power supply and is in signal communication with the inner plate and at least one of the first and second cable fixtures. The inner plate, the first and second outer plates, and the first and second cable fixtures are coupled together to form a unitary structure. The inner plate is electrically insulated from the first and second outer plates, the first and second cable fixtures. The first and second outer plates are electrically insulated from one another. The inner plate is capacitively coupled to the first and second outer plates.
G01F 23/263 - Indication ou mesure du niveau des liquides ou des matériaux solides fluents, p.ex. indication en fonction du volume ou indication au moyen d'un signal d'alarme en mesurant des variables physiques autres que les dimensions linéaires, la pression ou le poids, selon le niveau à mesurer, p.ex. par la différence de transfert de chaleur de vapeur ou d'eau en mesurant les variations de capacité ou l'inductance de condensateurs ou de bobines produites par la présence d'un liquide ou d'un matériau solide fluent dans des champs électriques ou électromagnétiques en mesurant les variations de capacité de condensateurs
E21B 47/01 - Dispositifs pour supporter des instruments de mesure sur des trépans, des tubes, des tiges ou des câbles de forage; Protection des instruments de mesure dans les trous de forage contre la chaleur, les chocs, la pression ou similaire
A hydraulic protection system for preventing collapse of a hydraulic line is provided. The system includes a pressure sensing assembly which is arranged to monitor a pressure differential between fluid external to and fluid contained within the hydraulic line; a pressure compensation assembly adapted to be coupled to the hydraulic line. In the event of a loss of pressure in the hydraulic line occurring, the pressure compensation assembly employs the pressure of the fluid external to the hydraulic line to increase the pressure of the fluid contained within the hydraulic line. The system is arranged so that the pressure compensation assembly is operated when the pressure differential monitored by the pressure sensing assembly reaches a predetermined level, which is below a collapse pressure of the hydraulic line, so that exposure of the hydraulic line to the collapse pressure is avoided.
A subsurface safety valve is provided. The subsurface safety valve includes an assembly configured to convert rotary motion from an electrically controlled drive into linear motion of a member, the member configured to actuate a valve.
E21B 34/06 - Aménagements des vannes pour les trous de forage ou pour les puits dans les puits
E21B 34/10 - Aménagements des vannes pour les trous de forage ou pour les puits dans les puits actionnés par un fluide de commande provenant de l'extérieur du trou de forage
A connector is described, including a housing including an internal volume, a port in the housing for receiving a conduit and providing access to the internal volume, a sealing arrangement for sealing the internal volume in the housing and a seal integrity test system including a sensor coupled to the housing. The seal integrity test system is configured to provide a measurement based on the pressure inside the internal volume of the housing to establish the integrity of the sealing arrangement.
G01M 3/28 - Examen de l'étanchéité des structures ou ouvrages vis-à-vis d'un fluide par utilisation d'un fluide ou en faisant le vide par mesure du taux de perte ou de gain d'un fluide, p.ex. avec des dispositifs réagissant à la pression, avec des indicateurs de débit pour soupapes
A gauge apparatus includes a body member, one or more gauge arms biased outwardly from the body member for engagement with a wall of the elongated space, and one or more deformable regions. The gauge apparatus is configured so that a variation in an outward extension of each gauge arm from the body member induces a change in strain in a corresponding one of the one or more deformable regions. A gauge system includes the gauge apparatus and an optical fiber attached to the gauge apparatus so that a strain in each deformable region of the gauge apparatus is transferred to a corresponding sensor portion of the optical fiber. The gauge system may be used for making real-time measurements of a geometry of an elongated space such as a wellbore of an oil and gas well.
G01B 3/46 - Calibres à tampon pour les dimensions intérieures avec des surfaces de contact dont l'écartement est fixe, mais peut être réglé à l'avance
G01B 5/12 - Dispositions pour la mesure caractérisées par l'utilisation de techniques mécaniques pour mesurer des diamètres des diamètres intérieurs
G01B 11/12 - Dispositions pour la mesure caractérisées par l'utilisation de techniques optiques pour mesurer des diamètres des diamètres intérieurs
G01B 11/16 - Dispositions pour la mesure caractérisées par l'utilisation de techniques optiques pour mesurer la déformation dans un solide, p.ex. indicateur optique de déformation
E21B 47/08 - Mesure du diamètre ou des dimensions correspondantes des trous de forage
A transmitter for use in downhole telemetry and/or control is provided. The transmitter comprises a mixer; modulator; and signal generation apparatus configured to generate a frequency modulated signal. The mixer is configured to generate an output signal based on the frequency modulated signal. A frequency spectrum of the output signal comprises upper and lower sidebands disposed about a suppressed or reduced frequency of the frequency modulated signal. The modulator is operable to modulate an input signal onto the output signal. A telemetry system and associated methods are also provided.
E21B 47/13 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage par énergie électromagnétique, p.ex. gammes de fréquence radio
H04L 27/12 - Circuits de modulation; Circuits émetteurs
H04L 25/49 - Circuits d'émission; Circuits de réception à au moins trois niveaux d'amplitude
A method and system of opportunistic communication in a well structure are provided. The method includes identifying at a first location an existing signal propagating in a section of the well structure between the first location and a second location; modifying that existing signal so as to encode information at the first location for opportunistic communication of that information to the second location; and receiving the modified signal at the second location and decoding the signal so as to retrieve the information.
E21B 47/12 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage
E21B 41/00 - Matériel ou accessoires non couverts par les groupes
H04B 3/04 - Systèmes à ligne de transmission - Détails Égalisation
H04B 3/54 - Systèmes de transmission par lignes de réseau de distribution d'énergie
In described examples, there are methods and systems for communicating data signals in wells. The methods and systems may facilitate communication of data signals, for example, from an open-hole section of a well, or in a well having a discontinuous metallic well structure.
E21B 47/12 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage
E21B 33/14 - Procédés ou dispositifs de cimentation, de bouchage des trous, des fissures ou analogues pour la cimentation des tubes dans les trous de forage ou de sondage
E21B 23/06 - Appareils pour déplacer, mettre en place, verrouiller, libérer ou retirer, les outils, les packers ou autres éléments dans les trous de forage pour le montage des packers
E21B 36/00 - Aménagements pour le chauffage, le refroidissement, l'isolation, dans les trous de forage ou dans les puits, p.ex. pour être utilisés dans les zones de permagel
E21B 47/13 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage par énergie électromagnétique, p.ex. gammes de fréquence radio
E21B 47/14 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage utilisant des ondes acoustiques
28.
METHODOLOGY FOR ANALYSIS OF VALVE DYNAMIC CLOSURE PERFORMANCE
A method for calculating a valve closure time includes performing a computational fluid dynamics model simulation of the valve. The method also includes performing multiple functional performance analysis model simulations of the valve based on the computational fluid dynamics model simulation of the valve to calculate the valve closure time. The functional performance analysis model simulations are based on a numerical solution of a second order differential equation according to an equation of motion given by: (I), where mL is a mass of translating components, y(t) is a piston displacement at a given time t, Fτ is a force on the valve due to fluid flow, Eμ is a friction force, FD is a hydraulic damping force on the piston, FD is a spring force, FPPA is a hydraulic piston pressure assist force, FBPA is a hydraulic bore pressure assist force, and FG is a force due to gravity.
G06F 30/28 - Optimisation, vérification ou simulation de l’objet conçu utilisant la dynamique des fluides, p.ex. les équations de Navier-Stokes ou la dynamique des fluides numérique [DFN]
G06F 17/13 - Opérations mathématiques complexes pour la résolution d'équations d'équations différentielles
29.
Method for communicating electrical signals in a well
There are described devices and methods for use, for example, with signaling in a well, e.g. using a well structure of the well. Such signaling may include the communication of power and/or data signals. The devices and methods used may assist with efficient and/or effective communication of such signals. In some examples, there is described deployable devices and methods, e.g. a deployable device for signaling contact in a well, and methods associated therewith.
E21B 47/13 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage par énergie électromagnétique, p.ex. gammes de fréquence radio
E21B 17/10 - Protecteurs contre l'usure; Dispositifs de centrage
A downhole injector apparatus for injecting a taggant into a wellbore includes an injector nozzle outlet and a taggant reservoir in fluid communication with the injector nozzle outlet and configured to hold the taggant to be injected. The apparatus further includes a pressure wave generator configured to apply a pressure wave within the reservoir to expel the taggant from the reservoir through the injector nozzle outlet.
E21B 47/11 - Localisation des fuites, intrusions ou mouvements du fluide utilisant la radioactivité
E21B 47/12 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage
An apparatus for controlling communication of data in a communications network within a well environment is provided. The apparatus includes a computer processor configured to undertake a method. The method includes analyzing previously recorded well parameter data recorded in the and/or one or more further well environments; determining, based on the analyzed well parameter data, a communication protocol for a node of the communications network; and uploading the determined communication protocol to the node. When deployed in the well environment, the node is configured to transmit and/or receive communications signals to/from one or more further nodes in the communications network using the determined communication protocol.
E21B 47/12 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage
A subsea test tree assembly is provided which includes at least one subsea test tree or SSTT, the SSTT including a valve having at least one of a cutting function and a sealing function, the valve being movable between an open position and a closed position via hydraulic fluid supplied to the valve through control lines; and a control system including a source of hydraulic fluid, the control system being arranged to supply hydraulic fluid from the source of hydraulic fluid to the valve of the at least one SSTT on detecting that the control lines have been sheared, to automatically move the valve to the closed position. A method of controlling a well using an SSTT assembly is also provided.
A deployable electrical contact device is provided that includes a body portion and a mounting arrangement. The mounting arrangement is controllably deployable from the body portion. The mounting arrangement is configured to retain the device at a position at a metallic well structure by mechanically engaging with a wall surface of the metallic well structure. The mounting arrangement includes electrically conductive pads configured to provide electrical continuity between the engaged metallic well structure and the mounting arrangement. The device is configured such that when deployed an electrical signal path between one or more of the conductive pads and the body portion is established to provide electrical continuity between the metallic well structure and the body portion.
E21B 47/13 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage par énergie électromagnétique, p.ex. gammes de fréquence radio
E21B 17/10 - Protecteurs contre l'usure; Dispositifs de centrage
The present disclosure describes a subsea well installation including an Xmas tree coupled to a wellhead. A guide frame is located at a lower region of the Xmas tree. A flush and cap tool (FACT) adaptor is mounted on an upper region of the Xmas tree. A tension arrangement extends between the guide frame and the FACT adaptor, to apply a compressive force through the Xmas tree.
A downhole gauge device for use in a well is described. The downhole gauge device includes one or more electrical systems including at least one measurement means for obtaining measurement data and a data transmitting means configured to transmit measurement data to a receiving station; a first power supply configured to supply a first amount of power to any of the one or more electrical systems; a second power supply configured to supply a second amount of power that is greater than the first amount of power to any of the one or more electrical systems; and means for selectively enabling one or both of the first and second power supply.
E21B 47/13 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage par énergie électromagnétique, p.ex. gammes de fréquence radio
E21B 41/00 - Matériel ou accessoires non couverts par les groupes
E21B 47/00 - Relevés dans les trous de forage ou dans les puits
E21B 47/14 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage utilisant des ondes acoustiques
H02J 7/00 - Circuits pour la charge ou la dépolarisation des batteries ou pour alimenter des charges par des batteries
36.
Autonomous systems and methods for wellbore intervention
An autonomous intervention system configured to perform an intervention operation in a wellbore comprises a tool housing having a tool storage compartment configured to house an intervention tool. A valve arrangement permits selective communication of tools and fluid between the tool housing and the wellbore. The intervention system is configured to move in response to an activation event between a tool storage configuration in which the tool housing is isolated from the wellbore by the valve arrangement and an activated configuration in which the valve arrangement is open and the tool housing communicates with the wellbore to permit deployment of the intervention tool by a tool deployment arrangement.
E21B 37/00 - Procédés ou appareils pour nettoyer les trous de forage ou les puits
E21B 33/076 - Têtes de puits; Leur mise en place comportant des dispositions pour introduire des objets dans les puits ou pour les en retirer, ou pour y introduire des fluides spécialement adaptés aux installations sous l'eau
E21B 19/22 - Manipulation de tubes ou de tiges enroulés, p.ex. de tubes de forage flexibles
E21B 23/14 - Appareils pour déplacer, mettre en place, verrouiller, libérer ou retirer, les outils, les packers ou autres éléments dans les trous de forage pour déplacer un câble ou un outil manoeuvré par câble, p.ex. pour les opérations de diagraphie ou de perforation dans les puits déviés
E21B 33/072 - Têtes de puits; Leur mise en place comportant des dispositions pour introduire des objets dans les puits ou pour les en retirer, ou pour y introduire des fluides pour les outils manœuvrés par câbles
E21B 21/10 - Aménagements des vannes dans les systèmes de circulation des fluides de forage
A valve seat for a valve is disclosed, the valve seat facilitating cutting of a body located within the seat. The valve seat includes a sealing surface for sealing with a valve member and an annular cutting component having a plurality of cutting teeth. The cutting teeth are circumferentially spaced and each defines an elongate crest. A valve is disclosed having a housing with a bore), a valve member and the valve seat. The valve seat is arranged within the housing in communication with the housing bore. The valve member is movable relative to the housing between an open position and a closed position.
E21B 34/04 - Aménagements des vannes pour les trous de forage ou pour les puits dans les têtes de puits dans les têtes de puits situées sous l'eau
F16K 5/06 - Robinets à boisseau consistant seulement en un dispositif obturateur dont au moins une des faces d'obturation a la forme d'une surface de solide de révolution plus ou moins complète, le mouvement d'ouverture et de fermeture étant essentiellement rota dont les boisseaux sont à surface sphérique; Leurs garnitures d'étanchéité
F16K 5/08 - Robinets à boisseau consistant seulement en un dispositif obturateur dont au moins une des faces d'obturation a la forme d'une surface de solide de révolution plus ou moins complète, le mouvement d'ouverture et de fermeture étant essentiellement rota - Détails
A fluid control system includes an apparatus comprising a first and second fluid port, first and second control lines, a valve arrangement being configurable between a first state in which the first fluid port is in fluid communication with the first control line and the second fluid port is in fluid communication with the second control line, wherein the apparatus is switchable between first and second configurations responsive to pressure differentials between the first and second control lines, and a second state in which the second fluid port is in fluid communication with a pressurized line and the first fluid port is in fluid communication with a vent arrangement to thereby configure the apparatus into the second configuration, and a control arrangement for reconfiguring the valve arrangement between the first and second states in response to an actuation signal.
There are described methods and apparatus for determining the condition of a barrier in a well infrastructure, for example. In some examples, sensor data that has been derived from a sensor arrangement at a barrier positioned at a location in a well infrastructure in received. That sensor data may be associated with measured conditions at the barrier, or the like. Composition data derived from measurements of fluid composition within the well may also be received. Such composition data may be indicative of the location at which fluid has been in the well. Analyzing such received sensor data and composition data may help determine the condition of the barrier. In some examples, there is described well apparatus comprising a barrier for zonal isolation, a sensor arrangement configured to monitor conditions at the location of the barrier; and one or more tracer elements configured to interact with fluid at the location of the barrier so as to impart identifiable properties to the composition of fluid.
In described examples, there are systems and methods for deployment in proximity to an abandoned well. The systems and methods may allow use of data collected from an abandoned well, in which a sensor is positioned in the open hole section, or a well having a discontinuous metallic well structure. In some examples, there is described a communication system that is configured to be deployed in an abandoned well having a discontinuous metallic well structure that may be severed below a ground region.
E21B 47/13 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage par énergie électromagnétique, p.ex. gammes de fréquence radio
A perforating gun, perforating gun system, and method for producing the same is provided. The perforating gun includes a body and at least one cavity liner. The body has an axial length extending between a first axial end and a second axial end, and an outer radial surface extending between the first and second axial ends, an inner bore, and at least one shaped charge cavity disposed in the outer radial surface. The at least one shaped charge cavity is in fluid communication with the inner bore. The at least one cavity liner is disposed in the shaped charge cavity and is configured to retain an explosive material within the shaped charge cavity.
E21B 29/02 - Découpage ou destruction de tubes, packers, bouchons ou câbles, situés dans les trous de forage ou dans les puits, p.ex. découpage de tubes endommagés, de fenêtres; Déformation des tubes dans les trous de forage; Remise en état des tubages de puits sans les retirer du sol au moyen d'explosifs ou par des moyens thermiques ou chimiques
E21B 43/116 - Perforateurs à balles ou à charge profilée
A landing string system and method therefor are provided. The landing string system has a measurement device with mechanical sensors that observe mechanical conditions associated with a landing string. Data-storage devices are in communication with the measurement device. The data-storage devices allow storage, from time to time, of data associated with the observed mechanical conditions. A power assembly provides power to the data-storage devices for at least an expected time of service of the system.
E21B 41/00 - Matériel ou accessoires non couverts par les groupes
E21B 47/09 - Localisation ou détermination de la position d'objets dans les trous de forage ou dans les puits; Identification des parties libres ou bloquées des tubes
E21B 33/035 - Têtes de puits; Leur mise en place spécialement adaptées aux installations sous l'eau
E21B 41/08 - Bases de guidage sous l'eau, p.ex. gabarits de forage; Mise à niveau de celles-ci
E21B 34/04 - Aménagements des vannes pour les trous de forage ou pour les puits dans les têtes de puits dans les têtes de puits situées sous l'eau
E21B 47/00 - Relevés dans les trous de forage ou dans les puits
G01L 1/22 - Mesure des forces ou des contraintes, en général en faisant usage des cellules électrocinétiques, c. à d. des cellules contenant un liquide, dans lesquelles un potentiel électrique est produit ou modifié par l'application d'une contrainte en utilisant des jauges de contrainte à résistance
G01L 5/102 - Appareils ou procédés pour la mesure des forces, du travail, de la puissance mécanique ou du couple, spécialement adaptés à des fins spécifiques pour la mesure de la tension dans les éléments flexibles, p.ex. dans les cordages, les câbles, les fils métalliques, les filaments, les courroies ou les bandes en utilisant des moyens électriques en utilisant des capteurs situés sur une partie non interrompue de l'élément flexible
A ball valve is provided. The ball valve includes a housing, a ball seat arranged in the housing, a ball member mounted within the housing and being rotatable relative to the ball seat between open and closed positions, the ball seat and ball member defining respective through bores, the ball member including a sealing surface, a bore surface and a leading edge surface extending between the sealing surface and the bore surface, the leading edge surface being configured to cut a body extending at least partially through the valve upon closure of the ball member, wherein said leading edge surface is truncated. The ball member may include a relief region proximate the leading edge surface.
E21B 29/08 - Découpage ou déformation des tuyaux pour commander l'écoulement du fluide
E21B 29/12 - Découpage ou destruction de tubes, packers, bouchons ou câbles, situés dans les trous de forage ou dans les puits, p.ex. découpage de tubes endommagés, de fenêtres; Déformation des tubes dans les trous de forage; Remise en état des tubages de puits sans les retirer du sol spécialement adapté aux installations sous-l'eau
E21B 33/064 - Obturateurs anti-éruption spécialement adaptés aux têtes de puits sous l'eau
E21B 34/04 - Aménagements des vannes pour les trous de forage ou pour les puits dans les têtes de puits dans les têtes de puits situées sous l'eau
E21B 34/10 - Aménagements des vannes pour les trous de forage ou pour les puits dans les puits actionnés par un fluide de commande provenant de l'extérieur du trou de forage
F16K 5/06 - Robinets à boisseau consistant seulement en un dispositif obturateur dont au moins une des faces d'obturation a la forme d'une surface de solide de révolution plus ou moins complète, le mouvement d'ouverture et de fermeture étant essentiellement rota dont les boisseaux sont à surface sphérique; Leurs garnitures d'étanchéité
F16K 27/06 - Structures des logements; Matériaux utilisés à cet effet des robinets ou des vannes
E21B 34/00 - Aménagements des vannes pour les trous de forage ou pour les puits
There are described methods and apparatus for determining the condition of a barrier in a well infrastructure, for example. In some examples, sensor data that has been derived from a sensor arrangement at a barrier positioned at a location in a well infrastructure in received. That sensor data may be associated with measured conditions at the barrier, or the like. Composition data derived from measurements of fluid composition within the well may also be received. Such composition data may be indicative of the location at which fluid has been in the well. Analyzing such received sensor data and composition data may help determine the condition of the barrier. In some examples, there is described well apparatus comprising a barrier for zonal isolation, a sensor arrangement configured to monitor conditions at the location of the barrier; and one or more tracer elements configured to interact with fluid at the location of the barrier so as to impart identifiable properties to the composition of fluid.
A retainer system, device and method are provided for retaining a severed pipe string such as a landing string suspended from a rig of a floating vessel or platform during a failure of a primary or secondary heave compensation system and prevent the severed pipe string from flying over the rig floor. The retainer system includes a retainer device including a housing mounted to a platform or vessel, the housing defining a through bore for receiving a pipe string suspended from the platform or vessel. A safety sleeve extends through the housing. A stop arrangement is mountable on the pipe string, to permit engagement between the safety sleeve and the stop arrangement in order to limit relative movement between the housing and the pipe string in order to retain a severed pipe string in an emergency situation.
E21B 41/00 - Matériel ou accessoires non couverts par les groupes
E21B 19/00 - Manipulation de tiges, tubages, tubes ou autre objets analogues à l'extérieur du trou de forage, p.ex. dans la tour de forage; Appareils pour faire avancer les tiges ou les câbles
E21B 23/01 - Appareils pour déplacer, mettre en place, verrouiller, libérer ou retirer, les outils, les packers ou autres éléments dans les trous de forage pour ancrer les outils ou similaires
A landing string includes a valve having a valve member mounted within a flow path extending through the landing string, and a valve control system for use in operating the valve to move the valve member between open and closed positions to control flow along the flow path. The valve control system is reconfigurable between a first configuration in which the valve is operated or controlled under a fail-as-is (FAI) mode of operation, and a second configuration in which the valve is operated or controlled under a fail-close (FC) mode of operation.
Downhole water level detecting apparatus for detecting the level of water in a formation in the region of a well installation. The detecting apparatus includes a transmitter for applying electrical signals to a signaling loop at a first location. The signaling loop includes a downhole metallic structure of the well installation and an earth return. The detecting apparatus also includes a detector for monitoring electrical signals in the signaling loop, and an evaluation unit arranged for determining a level of water in the formation relative to the downhole metallic structure in dependence on the monitored signals.
E21B 47/04 - Mesure de la profondeur ou du niveau du liquide
E21B 47/12 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage
A ball valve apparatus includes a housing defining a housing inlet and a housing outlet and a valve cartridge mounted within the housing and defining a cartridge flow path extending between a cartridge inlet and a cartridge outlet, wherein the cartridge inlet is arranged in fluid communication with the housing inlet and the cartridge outlet is arranged in fluid communication with the housing outlet. A ball valve member is mounted within the valve cartridge and is rotatable to selectively open and close the cartridge flow path. A leak chamber is defined between the housing and the cartridge for containing fluid leakage from the valve cartridge.
E21B 34/02 - Aménagements des vannes pour les trous de forage ou pour les puits dans les têtes de puits
E21B 33/076 - Têtes de puits; Leur mise en place comportant des dispositions pour introduire des objets dans les puits ou pour les en retirer, ou pour y introduire des fluides spécialement adaptés aux installations sous l'eau
E21B 33/038 - Connecteurs utilisés sur les têtes de puits, p.ex. pour relier l'obturateur anti-éruption et la colonne montante dans l'eau
E21B 34/00 - Aménagements des vannes pour les trous de forage ou pour les puits
A valve assembly for wellbore, downhole or intervention operations, such as for subsea wellbore operations includes a rotatable valve member having a passage formed therein. The valve assembly is reconfigurable between a first configuration in which the passage is aligned or alignable with a first conduit, and a second configuration in which the passage is misaligned or misalignable with the first conduit, so as to cut or sever and/or clamp apparatus present in the valve member passage prior to reconfiguration. The assembly is configured to apply a maximum cutting force at a particular phase or stage of the reconfiguration.
E21B 29/04 - Sectionnement de câbles ou similaires
E21B 29/08 - Découpage ou déformation des tuyaux pour commander l'écoulement du fluide
E21B 29/12 - Découpage ou destruction de tubes, packers, bouchons ou câbles, situés dans les trous de forage ou dans les puits, p.ex. découpage de tubes endommagés, de fenêtres; Déformation des tubes dans les trous de forage; Remise en état des tubages de puits sans les retirer du sol spécialement adapté aux installations sous-l'eau
E21B 33/064 - Obturateurs anti-éruption spécialement adaptés aux têtes de puits sous l'eau
E21B 34/04 - Aménagements des vannes pour les trous de forage ou pour les puits dans les têtes de puits dans les têtes de puits situées sous l'eau
E21B 34/00 - Aménagements des vannes pour les trous de forage ou pour les puits
A well installation communication system includes downhole metallic structure 2, a downhole communication unit 3, and a surface communication unit 4 arranged for electrical signal communication with the downhole communication unit via a signal channel. The signal channel includes a portion of the downhole metallic structure 2, a portion of cable 5 running within the downhole metallic structure away from said portion of the downhole metallic structure towards the surface and a connection device 6. The connection device 6 is in the signal channel between the portion of metallic structure 2 and the portion of cable 5. The connection device is removeably deployed in the metallic structure, is electrically disconnectably and reconnectably connected to the metallic structure and has a connector portion to which an end of the cable is mechanically and electrically connected.
E21B 47/12 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage
A lateral bore communication system where data signals are transmitted across the break in conductive path between a main bore and a lateral bore using a downhole structure section which has an electrode provided around a tubing portion and separated therefrom by an insulating layer.
E21B 47/13 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage par énergie électromagnétique, p.ex. gammes de fréquence radio
E21B 47/12 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage
E21B 17/00 - Tiges ou tubes de forage; Trains de tiges souples; Tiges d'entraînement; Masses-tiges; Tiges de pompage; Tubages; Colonnes de production
E21B 41/00 - Matériel ou accessoires non couverts par les groupes
An impressed current cathodic protection arrangement includes an elongate metallic structure to be protected and cathodic protection apparatus which comprises a DC power supply and an anode. One terminal of the power supply is connected to the structure at a connection point and another terminal of the power supply is connected to the anode. The arrangement includes monitoring apparatus for monitoring effectiveness of cathodic protection provided by the cathodic protection apparatus by determining the electrical potential of the structure relative to surroundings at at least one location which is spaced from the connection point.
G08B 21/00 - Alarmes réagissant à une seule condition particulière, indésirable ou anormale, et non prévues ailleurs
E21B 47/12 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage
G01V 3/34 - Transmission de données aux appareils d'enregistrement ou de traitement; Enregistrement de données
Downhole water level detecting apparatus for detecting the level of water in a formation in the region of a well installation. The detecting apparatus includes a transmitter for applying electrical signals to a signaling loop at a first location. The signaling loop includes a downhole metallic structure of the well installation and an earth return. The detecting apparatus also includes a detector for monitoring electrical signals in the signaling loop, and an evaluation unit arranged for determining a level of water in the formation relative to the downhole metallic structure in dependence on the monitored signals.
E21B 47/04 - Mesure de la profondeur ou du niveau du liquide
E21B 47/12 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage
A valve assembly (2) which is configured to be coupled to a tubing string comprises a housing (8) defining a housing flow path (9) for communicating with the tubing string, and a barrier member (14) located in the housing (8) and configurable between a normally-closed position in which the barrier member (14) restricts access through the housing flow path (9), and an open position in which access is permitted through the housing flow path (9). The valve assembly (2) also comprises a bypass arrangement reconfigurable between an open state in which the bypass arrangement defines a bypass flow path that communicates with the housing flow path (9) on opposite sides of the barrier member (14) to permit fluid to bypass the barrier member and thereby fill the tubing string, and a closed state in which fluid is prevented from bypassing the barrier member to thereby permit pressurization of the tubing string.
E21B 34/06 - Aménagements des vannes pour les trous de forage ou pour les puits dans les puits
E21B 34/10 - Aménagements des vannes pour les trous de forage ou pour les puits dans les puits actionnés par un fluide de commande provenant de l'extérieur du trou de forage
E21B 34/14 - Aménagements des vannes pour les trous de forage ou pour les puits dans les puits actionnés par le mouvement des outils, p.ex. obturateurs à manchons actionnés par des pistons ou par des outils à câble
E21B 34/00 - Aménagements des vannes pour les trous de forage ou pour les puits
55.
Electrical power and/or electrical signal transmission
An electrical power and/or electrical signal transmission system for transmitting electrical power and/or electrical signals from a location on a first side of a metallic wall to a location on a second side of the metallic wall includes a transmitting apparatus having an electrical source and a first transformer. A receiving apparatus has a receiving module for receiving electrical power and/or electrical signals and a second transformer. First and second ends of a primary winding of the second transformer are electrically connected to respective spaced locations on the second, opposite, side of the metallic wall for picking up electrical power and/or electrical signals from the metallic wall. The receiving module is electrically connected to a secondary winding of the second transformer to enable electrical power and/or electrical signals to be transmitted from the electrical source to the receiving module.
E21B 47/12 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage
H04B 5/00 - Systèmes de transmission à induction directe, p.ex. du type à boucle inductive
G01D 5/06 - Moyens mécaniques pour le transfert de la grandeur de sortie d'un organe sensible; Moyens pour convertir la grandeur de sortie d'un organe sensible en une autre variable, lorsque la forme ou la nature de l'organe sensible n'imposent pas un moyen de conversion déterminé; Transducteurs non spécialement adaptés à une variable particulière utilisant des moyens mécaniques agissant à travers une paroi ou une enceinte, p.ex. par soufflets, par accouplement magnétique
Downhole electrical power generation apparatus and methods of using stored pressurized gas and/or ambient downhole pressure. One example comprises first and second fluid receiving chambers, a fluid communication path for allowing flow of fluid from the first chamber via the fluid communication path to the second chamber and a turbine generator disposed so that fluid flowing from the first chamber via the fluid communications path to the second chamber operates the turbine generator to generate electrical power.
H04B 13/02 - Systèmes de transmission dans lesquels le milieu de propagation est constitué par la terre ou une grande masse d'eau la recouvrant, p.ex. télégraphie par le sol
G01V 3/00 - Prospection ou détection électrique ou magnétique; Mesure des caractéristiques du champ magnétique de la terre, p.ex. de la déclinaison ou de la déviation
F16D 31/00 - Accouplements ou embrayages à fluide avec des groupes de pompage du type volumétrique, c. à d. dans lesquels passe un volume déterminé de liquide par tour de pompe
F16D 33/00 - Accouplements ou embrayages rotatifs à fluide du type hydrocinétique
F16D 33/02 - Accouplements ou embrayages rotatifs à fluide du type hydrocinétique commandés par changement du débit du liquide dans le circuit de travail, ce circuit étant par ailleurs maintenu complètement rempli
F16D 31/02 - Accouplements ou embrayages à fluide avec des groupes de pompage du type volumétrique, c. à d. dans lesquels passe un volume déterminé de liquide par tour de pompe utilisant des pompes à pistons ou à plongeurs travaillant dans des cylindres
F16D 39/00 - Combinaisons d’accouplements suivant plusieurs des groupes
E21B 41/00 - Matériel ou accessoires non couverts par les groupes
A well installation includes a metallic structure having downhole metallic tubing for conveying product towards the surface, a sub surface safety valve disposed in the downhole metallic tubing for interrupting flow of product towards the surface when closed and allowing flow of product towards the surface when open. Also, valve control means are disposed downhole and arranged for detecting electrical signals in the downhole metallic tubing and for holding the valve open while receiving an electrical signal, and surface signaling means for applying an electrical signal to metallic structure of the well for transmission via the downhole metallic tubing towards the valve control means so as to hold the valve open. The system can be made more robust by ensuring that the control means will only hold the valve open while receiving a signal of given characteristics to help prevent stray currents erroneously holding the valve open.
E21B 23/00 - Appareils pour déplacer, mettre en place, verrouiller, libérer ou retirer, les outils, les packers ou autres éléments dans les trous de forage
E21B 34/06 - Aménagements des vannes pour les trous de forage ou pour les puits dans les puits
G01V 11/00 - Prospection ou détection par des méthodes combinant des techniques spécifiées dans les groupes
E21B 47/12 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage
58.
Signalling systems and methods for communicating with a downhole location in a well installation
Methods and systems are described for communicating with downhole locations and transmitting power to downhole locations. Use is made of a cable passing someway down into the well. This cable may be connected to a downhole sensor and may be used primarily for communicating with that sensor, but also used in the current techniques described herein. Electrical connection is achieved between the cable and the metallic structure of the well to allow signals to be transferred between the communications tool and the surface via the cable.
E21B 47/16 - Moyens pour la transmission de signaux de mesure ou signaux de commande du puits vers la surface, ou de la surface vers le puits, p.ex. pour la diagraphie pendant le forage utilisant des ondes acoustiques le long du train de tiges ou du tubage
A downhole signal receiving system where a pair of setting devices (51) are used to electrically connect with downhole structure and are connected to one another by a bulk conductor (52). Signals are extracted by using a detecting means (53) that does not interrupt the conduction path. The tool provides a low impedance conduction path along which signals from the surrounding structure can flow to facilitate detection.
G01V 3/00 - Prospection ou détection électrique ou magnétique; Mesure des caractéristiques du champ magnétique de la terre, p.ex. de la déclinaison ou de la déviation
Methods of and apparatus for a downhole communication in a well. The well has a metallic structure which includes an insulated metallic, fluid carrying, control line. The method comprises the steps of applying signals to the control line at a first location and extracting the signals from the control line at a second location.
There is also provided a downhole communication system for use in a well having a metallic structure. The metallic structure includes an insulated metallic, fluid carrying, control line. The system comprises means for applying signals to the control line at a first location and means for extracting the signals from the control line at a second location. The control line acts as a signal channel.
Other methods and apparatus making use of control line carrying no fluid and/or the metallic shielding of cable having insulated metallic shield are also described.
G01V 3/00 - Prospection ou détection électrique ou magnétique; Mesure des caractéristiques du champ magnétique de la terre, p.ex. de la déclinaison ou de la déviation
brevets
