The present disclosure is for a tool for measurement of phases in fluid in downhole applications. The tool includes a light coupler for providing a first light and for detecting a second light. The first light is provided to an optical interface and the second light is received from the optical interface. The optical interface is between the tool and the fluid. An optical path is provided that is integral or coupled to the optical interface. The optical path allows transmission of the first light into the fluid at the optical interface and also allows receiving the second light from the optical interface. The second light includes one or more light components disturbed by the fluid. A processor provides digital data associated with the measurement of phases in the fluid using optical data from at least the second light.
Embodiments of the present disclosure include a system for driving an arm (60, 80, 82) radially outward from a work string axis including a pivot block (76A, 76B) coupled to the arm at a first coupling, the arm rotating about the first coupling in a first direction to move from a stored position to an expanded position, and about the first coupling in a second direction to move from the expanded position to the stored position. The system also includes a biasing member that drives movement of the arm in the first direction. The system further includes a chamber for storing the biasing member within a pivot block diameter when the arm is in the stored position.
E21B 47/00 - Relevés dans les trous de forage ou dans les puits
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
E21B 47/10 - Localisation des fuites, intrusions ou mouvements du fluide
E21B 17/10 - Protecteurs contre l'usure; Dispositifs de centrage
G01V 11/00 - Prospection ou détection par des méthodes combinant des techniques spécifiées dans les groupes
Embodiments of the present disclosure include a system for positioning a sensor within a flow path of a wellbore annulus including a work string extending into the well bore annul us from a surface location. The system includes a moveable arm on the work string, the arm transitioning between a first radial location and a second radial location. The system further includes a bracket coupled to the arm, the bracket being pivotable about a pivot axis, wherein the bracket supports the sensor and transitions the sensor from a stored position to a deployed position.
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
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
Embodiments of the present disclosure include a deployment system including an actuator. The deployment system also includes an actuator arm coupled to the actuator. The deployment system further includes a crank rotatably coupled at a pivot point. The deployment system also includes a first link arm coupled to the actuator arm at a first end and the crank at a second end. The deployment system includes a second link arm coupled to the crank at a first end and a deployment arm at a second end, the second link arm transmitting rotational movement of the crank to the deployment arm.
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 41/00 - Matériel ou accessoires non couverts par les groupes
Embodiments of the present disclosure include a sensor deployment system with a first bulkhead arranged at a first end of a downhole tool, a second bulkhead arranged at a second end of the downhole tool, opposite the first end, a first pivot block arranged proximate the first bulkhead, a second pivot block arranged proximate the second bulkhead, and an arm rotatably coupled to the first and second pivot blocks at opposite ends of the arm, wherein rotation of at least a portion of the arm drives at least a portion of the arm radially outward from an axis of the downhole tool.
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
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
A sensor for measuring a property comprises: a radiation source, a detector and a sensing element. The radiation source is operable to produce a radiation beam. The detector is provided with a detecting surface for receiving radiation and outputting a signal in dependence on the received radiation. An aperture extends through the detector from the detecting surface to an opposed surface. The sensing element is operable to receive radiation and to reflect at least a portion of the radiation so as to form a reflected radiation beam, one or more properties of the reflected radiation beam being dependent on one or more properties to be measured. The radiation source and the sensing element are disposed on opposite sides of the detector such that the radiation source is arranged to direct the radiation beam through the aperture to the sensing element and the sensing element is arranged to direct the reflected radiation beam to the detecting surface of the detector.
E21B 49/08 - Prélèvement d'échantillons de fluides ou test des fluides dans les trous de forage ou dans les puits
G01N 21/85 - Analyse des fluides ou solides granulés en mouvement
G01N 21/359 - Couleur; Propriétés spectrales, c. à d. comparaison de l'effet du matériau sur la lumière pour plusieurs longueurs d'ondes ou plusieurs bandes de longueurs d'ondes différentes en recherchant l'effet relatif du matériau pour les longueurs d'ondes caractéristiques d'éléments ou de molécules spécifiques, p.ex. spectrométrie d'absorption atomique en utilisant la lumière infrarouge en utilisant la lumière de l'infrarouge proche
A method for determining the concentrations of elements within a geologic formation includes the use of an inversion algorithm that seeks to minimize a cost function (F). The method includes the use of an iterative process 200 that updates the calculated concentrations of each element at each iteration using the gradient of the cost function (F). If the method returns a negative value for any of the elemental concentrations, the corresponding derivative is set to zero and the iterative process continues. The iteration is terminated if the difference between the model and measurement becomes suitably small or if a predetermined threshold number of iterations have been taken. The results of the determination of the elemental concentrations are displayed on a computer.
G01V 5/10 - Prospection ou détection au moyen de radiations nucléaires, p.ex. de la radioactivité naturelle ou provoquée spécialement adaptée au carottage en utilisant des sources de radiation nucléaire primaire ou des rayons X en utilisant des sources de neutrons
8.
SENSITIVE DC CURRENT IMBALANCE DETECTOR AND CALIBRATION METHOD
A current leakage detector (100) is configured for detecting current leakage between a power source and a load. The current leakage detector (100) includes a first sensing coil (122) and a second sensing coil (124) positioned opposite the first sensing coil (122). The current leakage detector (100) further includes a magnetic field sensor (126) proximate the first sensing coil (122) and the second sensing coil (124) and the magnetic field sensor has a response range. The current leakage detector also includes a bias circuit (132) configured to adjust the response range of the magnetic field sensor. A method for detecting current leakage includes the steps of providing a first sensing coil (122) and a second sensing coil (124). The method continues with the steps of providing a magnetic field sensor in proximity to the first and second sensing coils and providing a bias circuit. The method continues with the step of utilizing the bias circuit to place the response of the magnetic field sensor within a preferred response range.
G01R 15/20 - Adaptations fournissant une isolation en tension ou en courant, p.ex. adaptations pour les réseaux à haute tension ou à courant fort utilisant des dispositifs galvano-magnétiques, p.ex. des dispositifs à effet Hall
G01R 31/02 - Essai des appareils, des lignes ou des composants électriques pour y déceler la présence de courts-circuits, de discontinuités, de fuites ou de connexions incorrectes de lignes
H02H 3/33 - Circuits de protection de sécurité pour déconnexion automatique due directement à un changement indésirable des conditions électriques normales de travail avec ou sans reconnexion sensibles à un angle de déphasage entre tensions ou courants comprenant la comparaison des valeurs de tension ou de courant en des points correspondants des différents conducteurs d'un même système, p.ex. de courants dans des conducteurs d'aller et retour utilisant des transformateurs sommateurs de courant
A peak hold circuit configured for use in a downhole sensor includes a long tail pair circuit, a correction circuit, and a current mirror circuit. The current mirror circuit includes two current mirrors connected to a long tail pair formed by a first transistor and a second transistor. The current mirror also includes a first resistor and a second resistor connected to a third transistor. The first transistor is connected to a correction transistor of the correction circuit. The value of the first resistor is selected to be essentially equal to the same value as the second resistor so that when the long tail pair is balanced, the current flowing through a collector of the second transistor is equal to the current flowing through the first transistor, causing the correction transistor to switch off.
An apparatus for determining the concentration of a conductive fluid present in a fluid filled bore hole is described. Such apparatus are known as water hold-up meters and are frequently used in oil, gas and water filled bore holes. In bore hole applications, data bandwidth between a down hole device and the surface can be limited, while determining water hold-up based on down hole measurements can be data intensive. A technique is proposed for calculating the water hold up that requires less data to be transmitted between the down hole device and the surface.
A Method and apparatus for determining the fluid permeability of an earth formation is described. An instrument (6) comprising an acoustic source (14, 16) and acoustic (18) and electrokinetic sensors (20) is located in a borehole (4) at a site of interest. The acoustic source is fired and the resulting variations in pressure and electric field generated are measured and recorded. The Biot equation, and an equation for the streaming potential coupled to fluid displacement terms, is solved using finite element analysis to give an expected pressure waveform and electrokinetic waveform based on estimated earth formation properties. By comparison of the measured waveforms and those calculated from the equations, the actual permeability of the earth formation can be deduced.
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