Provided is a technique capable of suppressing reduction in thickness of a downhole tool or a component thereof in a well at a high temperature. As a means for solving the above-mentioned issue, provided is a resin composition including: 50 parts by mass or more and 97 parts by mass or less of polyglycolic acid; 3 parts by mass or more and 50 parts by mass or less of polybutylene terephthalate; and 2 parts by mass or more and 15 parts by mass or less of a cyclic carbodiimide compound with respect to 100 parts by mass of a total amount of the polyglycolic acid and the polybutylene terephthalate.
Provided is a downhole plug device that is unlikely to hinder a separate operation carried out after removal thereof. Also provided are a tube affixing method and a tube inspection method. The downhole plug device (1) affixes a seal (12) that seals one end of a cylindrical housing (11) to the housing (11) by means of bolts (13) passing through the seal (12). The downhole plug device (1) is connected to the end of a tube inserted into a casing in a borehole, and is used in a method of inspecting for the presence or absence of leakage of fluid from the tube in the borehole.
Provided is a glycolic acid copolymer composition which can be solidification/extrusion-molded and can be molded into a molded article having an improved thickness decreasing rate during decomposition. The glycolic acid copolymer composition according to the present invention comprises: a glycolic acid copolymer in which at least two linear polymer chains A each composed of a repeating unit derived from glycolic acid are chemically bound to a specific polymer chain B that is different from the polymer chain A; and a carboxylic acid anhydride. The weight average molecular weight of the composition is 150000 or more.
Provided are: a molded product in which the strength anisotropy between the MD direction and the TD direction is small; and a processed article of the molded product. A molded product (10) contains a glycolate-based polymer and multiple fibers (11). The fibers (11) include, at a specific ratio, fibers aligned in the MD direction and fibers aligned in a direction along a tangent line of a concentric circle in a cross section orthogonal to the MD direction.
This molded body is composed of a composition including a glycolic acid polymer, a plasticizer, and a degradation promoter. The absolute value of the difference between the Fedors solubility parameter of the plasticizer and the Fedors solubility parameter of the glycolic acid polymer is 6 (J/cm3)1/2 or lower. The plasticizer content of the composition is 10-50 mass%.
Provided are a downhole tool securing device and a frac plug, which have excellent setting properties and water pressure resistance, and which are equipped with favorable fracturing properties. A downhole tool securing device (slip 106a, 106b) for a frac plug (100) of an embodiment of the present invention is equipped with buttons (602) that contain a powdered metallurgical material, that have a compressive elastic modulus of at least 13.5 GPa, and that have a toughness of 0.236 GJ/m3 to 1.0 GJ/m3.
The plant growth regulator according to an embodiment of the present invention contains an extract of an ergothioneine-producing microorganism as an active ingredient. The extract contains ergothioneine.
A plug to maintain isolation in a high-temperature and low salt concentration fluid 5 or water for a period of time. The plug includes a resin molded article which is formed from a polyglycolic acid resin composition containing a polyglycolic acid and a cyclic carbodiimide compound and has a carbodiimide group concentration 15 eq/t. The polyglycolic acid resin composition contains 0.4 mass% of the cyclic carbodiimide compound. The resin molded article comprises a center part 10 and a surface part. The center part has a weight average molecular weight of 70000 after immersion in water at 80°C for 48 hours. The surface part has a weight average molecular weight of 20000 after immersion in water at 80°C for 48 hours. A difference between a thickness of the center part and a thickness of the resin molded article before immersion is 0.1 mm or 2.0 mm.
In a dart for a downhole device according to the present invention, a ball is formed of a first degradable material having a first degradation rate, a mandrel is formed of a second degradable material having a second degradation rate lower than the first degradation rate, and a sleeve is formed of the second degradable material or a third degradable material having a third degradation rate lower than the second degradation rate.
E21B 34/14 - Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
E21B 34/10 - Valve arrangements for boreholes or wells in wells operated by control fluid supplied from outside the borehole
10.
FRAC PLUG AND METHOD FOR MANUFACTURING SAME, AND METHOD FOR SEALING BOREHOLE
Provided is a frac plug or the like capable of being inserted into a borehole to seal the borehole with high strength, and then quickly disassembled and removed, thereby efficiently producing petroleum. A frac plug (10) according to the present embodiment has a member made of a magnesium (Mg) alloy. The member has a multi-phase structure including a first phase (31), which is a matrix phase, and a second phase (32) present in the first phase (31). In the multi-phase structure, the second phase (32) is distributed in a substantially striped pattern in the first phase in a first cross section perpendicular to a second direction of the frac plug (10), and distributed in a substantially mesh-like pattern in the first phase in a second cross section perpendicular to a first direction of the frac plug (10).
C22C 23/04 - Alloys based on magnesium with zinc or cadmium as the next major constituent
C22C 23/06 - Alloys based on magnesium with a rare earth metal as the next major constituent
E21B 29/00 - Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
The present invention provides a plant disease control agent which has low toxicity to humans and animals and excellent handling safety, while exhibiting an excellent controlling effect on a wide range of plant diseases and a high antibacterial activity against plant pathogenic bacteria. The present invention is a compound represented by general formula (I), an N-oxide thereof, or an agrochemically acceptable salt thereof.
C07D 233/56 - Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members with only hydrogen atoms or radicals containing only hydrogen and carbon atoms, attached to ring carbon atoms
C07D 401/12 - Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings linked by a chain containing hetero atoms as chain links
C07D 403/12 - Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group containing two hetero rings linked by a chain containing hetero atoms as chain links
12.
METHOD FOR PRODUCING NOVEL MICROORGANISMS AND ERGOTHIONEINE
NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY (Japan)
Inventor
Koshiyama, Tatsuyuki
Kaneko, Mutsumi
Higashiyama, Yukihiro
Sato, Shun
Morita, Tomotake
Saika, Azusa
Abstract
Microorganisms according to the present invention are Dirkmeia churashimaensis (NITE BP-03054), Papiliotrema flavescens (NITE BP-03051), Papiliotrema flavescens (NITE BP-03052), or Apiotrichum porosum (NITE BP-03053).
To provide a plant growth regulator having an excellent effect of promoting plant growth, the plant growth regulator according to the present invention comprises, as an active ingredient, a compound represented by formula (I), a tautomer thereof or an agrochemically acceptable salt of the same. (In the formula: R1 and R2 independently represent a hydrogen atom or an alkyl group having 1-4 carbon atoms; and R3 to R5 independently represent an alkyl group having 1-4 carbon atoms.)
Provided is a bactericidal agent for agricultural or horticultural use, which has low toxicity to human bodies and animals and excellent handling safety and can exhibit an excellent controlling effect against a wide range of plant diseases and a high bactericidal activity against pathogenic bacteria for plant diseases. The bactericidal agent for agricultural or horticultural use according to the present invention contains an azole derivative represented by general formula (I) as one active ingredient and further contains another active ingredient.
A01N 47/18 - Carbamic acid derivatives, i.e. containing the group —O—CO—N; Thio-analogues thereof containing a —O—CO—N group, or a thio-analogue thereof, directly attached to a heterocyclic or cycloaliphatic ring
A downhole tool that can maintain a high degradation rate even in high-temperature environments and a use of the downhole tool for a well drilling. The downhole tool includes: a first member made of a reactive metal; and a second member made of a degradable resin composition promoting degradation of the reactive metal, the degradable resin composition containing a degradable resin producing an acid by degradation, wherein a molar ratio of a maximum amount of the acid which the degradable resin composition is capable of producing to a content of the reactive metal is 1.0 or higher.
Provided is a downhole tool which has a high initial compressive strength, which can maintain compressive strength for a given period of time, and which can be broken down rapidly after use. This downhole tool is formed from a biodegradable resin containing a polyamide resin and a carboxylic anhydride. The carboxylic anhydride is a compound that satisfies the following melting point conditions. Melting point of polyamide resin = temperature at which a 5% reduction in weight of carboxylic anhydride occurs.
C08L 77/00 - Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
E21B 23/00 - Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
E21B 33/13 - Methods or devices for cementing, for plugging holes, crevices, or the like
E21B 43/16 - Enhanced recovery methods for obtaining hydrocarbons
17.
PLUG, RETAINING MEMBER, AND METHOD FOR WELL COMPLETION USING PLUG
Provided is a plug wherein there is no effect such as breaks and the like on the members constituting said plug when blocking a borehole. This downhole plug (10) comprises: a hollow mandrel (1); a seal member (2) attached to the outer peripheral surface of the mandrel (1) and that deforms under pressure; and a socket (3) on the outer peripheral surface of the mandrel (1) and attached next to the seal member (2) on the side of the seal member (2), dowstream from where pressure is applied thereto. In the socket (3), the inner peripheral edge (31a) in contact with the mandrel (1) protrudes toward the seal member's (2) side.
Provided is a plug wherein there is no effect such as breaks and the like on the members constituting said plug when blocking a borehole. This downhole plug (10) comprises: a hollow mandrel (1); an annular seal member (2) attached to the outer peripheral surface of the mandrel (1) and that deforms under pressure; and an annular socket (3) attached on the outer peripheral surface of the mandrel (1) and next to the seal member (2) on the side of the seal component (2), downstream from where pressure is applied thereto. The socket (3) is configured so as to comprises: a socket inner part (31) in contact with the outer peripheral surface of the mandrel (1); and an annular socket outer part (32) that has an inner diameter equal to or greater than the socket inner part (31) and that is attached to the socket inner part (31) so as to be mobile. The socket outer part (32) has a surface facing the seal component (2).
Provided is a plug with excellent pressure resistance. A downhole plug (20) comprises a mandrel (1), a center element (2), at least one lip (3), and a pressure transmission means. The ratio (b/a) of the length (b) in the axial direction of the portion where the mandrel (1) and the center element (2) are in contact to the maximum length (a) in the axial direction of the center element (2) in a cross section taken along the axial direction in a state where the center element (2) is deformed as a result of a pressure of 50 MPa being applied to the downhole plug (20) in the axial direction is less than 0.5.
Provided is a downhole plug for well drilling, wherein the downhole plug can restore a flow path in a short time by quickly degrading after hydraulic fracturing. A downhole plug (10) includes a mandrel (1) made of a degradable material and a plurality of peripheral members (2, 3, 4, 5, 6a, 6b, 8a, 8b) made of a degradable material and provided on the outer circumferential face of the mandrel (1). At least one of the plurality of peripheral members (6a, 6b) has a hollow portion (64) through which a fluid flowing in the axial direction of the mandrel (1) can flow or has a groove on at least a portion of the face that is the exterior face of the downhole plug (10) or the face in contact with the mandrel (1).
E21B 33/129 - Packers; Plugs with mechanical slips for hooking into the casing
21.
AZOLE DERIVATIVE, INTERMEDIATE COMPOUND, METHOD FOR PRODUCING AZOLE DERIVATIVE, AGRICULTURAL OR HORTICULTURAL CHEMICAL AGENT, AND PROTECTIVE AGENT FOR INDUSTRIAL MATERIAL
It is provided a plant disease controlling agent having low toxicity to human and animals and excellent handling safety, and showing excellent controlling effects on various plant diseases and high antibiotic action to plant disease germs. The agent can comprise a compound represented by the following the general formula (I), or an N-oxide or agrochemically acceptable salt thereof. (see formula I)
C07D 401/06 - Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings linked by a carbon chain containing only aliphatic carbon atoms
C07D 401/12 - Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings linked by a chain containing hetero atoms as chain links
22.
DOWNHOLE TOOL MEMBER AND MANUFACTURING METHOD THEREOF
Provided is a downhole tool member containing a polyglycolic acid resin composition that is easy to process during extrusion molding or injection molding, is able to reduce cracks during cutting and transportation, and has sufficient strength in a well in a high temperature environment. The downhole tool member according to an embodiment of the present invention contains a polyglycolic acid resin composition, in which a weight-average molecular weight Mw is from 150,000 to 300,000, and a melt viscosity Mv (Pa.cndot.s), measured at a temperature of 270°C under a shearing speed of 122 sec-1, satisfies Mv < 6.2 x 10-5 x Mw3.2.
Provided is a rubber composition for downhole tools which has superior decomposability and storability. This rubber composition for downhole tools contains a decomposable rubber, a decomposition-accelerating agent, and a decomposition-inhibiting agent. The decomposition-accelerating agent is at least one compound represented by formula (I) or (II). The decomposition-inhibiting agent is at least one selected from the group consisting of carbodiimide compounds, oxazoline compounds, oxazine compounds, and epoxy compounds. The contained amount of the decomposition-accelerating agent is 0.1-20 parts by mass with respect to 100 parts by mass of the decomposable rubber. The contained amount of the decomposition-inhibiting agent is 0.1-3 parts by mass with respect to 100 parts by mass of the decomposition rubber.
The present invention addresses the problem of providing a well closing device capable of reducing costs and shortening a process for boring a well, and a method for temporarily closing the well by using the well closing device. This well closing device includes: a down hole plug; a setting tool (2) for operating and installing the down hole plug; and an obstacle for closing the flow passage of the down hole plug, wherein the obstacle is included in the setting tool (2), and thus the flow passage of the down hole plug can be reliably closed in a short time after installing the down hole plug inside a well and removing the setting tool (2). In addition, by using this well closing device, the well can be temporarily closed reliably in a short time.
A novel composition which contributes to reducing costs and to shortening processes and which can contribute to improving production efficiency, a composition for a downhole tool, a degradable rubber member for a downhole tool, a downhole tool, and a well drilling method are provided. This composition contains a degradable rubber and a decomposition accelerator, and, as the aforementioned decomposition accelerator, contains 0.1-20 parts by mass of at least one type of compound represented by general formula (I) per 100 parts by mass of the degradable rubber; this downhole tool composition contains said composition; the degradable rubber member for a downhole tool, and a downhole tool are provided; and the well drilling method makes use of these. (In expression (I), R is an alkyl group of 2-6 carbon atoms.)
This shaped material for downhole tool member is a magnesium alloy in which 0 wt% or more and less than 0.3 wt% of a rare earth metal, a metal material other than magnesium and a rare earth metal, and 0.1 to 20 wt% of a decomposition promoter are dispersed in a phase containing 70-95 wt% of magnesium, the average particle diameter of the metal material being 1-300 µm, the tensile strength being 200-500 MPa, and the decomposition speed in a 2% potassium chloride aqueous solution at 93°C being 20 mg/cm2 to 20,000 mg/cm2 per day. A high-strength, readily decomposable downhole tool is realized thereby.
C22F 1/06 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
C22F 1/00 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
27.
COMPOSITION FOR WELL DRILLING COMPRISING REACTIVE METAL AND DEGRADABLE RESIN COMPOSITION, MOLDED PRODUCT FOR WELL DRILLING, AND METHOD FOR WELL DRILLING
Provided are a molded product for well drilling comprising a reactive metal and a degradable resin composition that promotes a degradation reaction of the reactive metal, preferably a degradable resin composition comprising a degradable resin that generates acid upon degradation or a degradable resin composition containing a degradable resin and an inorganic material or an organic material that promotes degradation of the reactive metal; a molded product for well drilling which is a downhole tool or a downhole tool member; and a method for well drilling that uses said molded product for well drilling.
C09K 8/88 - Compositions based on water or polar solvents containing organic compounds macromolecular compounds
E21B 33/00 - Sealing or packing boreholes or wells
E21B 43/00 - Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
E21B 43/267 - Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
28.
DOWNHOLE TOOL CONTAINING DOWNHOLE-TOOL MEMBER CONTAINING REACTIVE METAL AND DOWNHOLE-TOOL MEMBER CONTAINING DEGRADABLE RESIN COMPOSITION, AND WELL-DRILLING METHOD
A downhole tool, provided with: a downhole-tool member containing a reactive metal; a downhole-tool member containing a degradable resin composition that promotes degradation of the reactive metal, preferably a degradable resin composition containing a degradable resin that generates an acid by degradation or a degradable resin composition containing a degradable resin and an inorganic substance or organic substance that promotes degradation of the reactive metal; and, as desired, a degradable rubber member. Moreover, a well-drilling method using this downhole tool.
C08L 101/00 - Compositions of unspecified macromolecular compounds
E21B 33/10 - Sealing or packing boreholes or wells in the borehole
E21B 43/26 - Methods for stimulating production by forming crevices or fractures
29.
MOLDED PRODUCT HAVING EFFECTIVE THICKNESS OF 1 MM OR MORE AND CONTAINING ALIPHATIC POLYESTER RESIN, AND DOWNHOLE TOOL MEMBER FOR HYDROCARBON RESOURCE RECOVERY
Provided are a molded product having an effective thickness of 1 mm or more, the molded product being formed from an aliphatic polyester resin composition containing from 1 to 30 parts by mass of a carboxylic acid anhydride and preferably further containing from 1 to 50 parts by mass of at least one type of a short fiber reinforcing material, a thermoplastic elastomer, or an acrylic rubber core-shell polymer per 100 parts by mass of an aliphatic polyester resin containing not less than 50 mass% of a polyglycolic acid resin, the effective thickness being 1 mm or more; a downhole tool for hydrocarbon resource recovery formed from the molded product having an effective thickness of 1 mm or more; an aliphatic polyester resin composition for the down hole tool member for hydrocarbon resource recovery; and a well drilling method.
Provided are: a degradable rubber member for a downhole tool, formed of a rubber material containing 0.1-20 mass parts of a degradation accelerant per 100 parts of degradable rubber (other rubber materials and/or reinforcing materials may be included as well), preferably one that experiences at least a 5% decrease in mass or in compressive stress at 50% strain subsequent to immersion for 24 hours in 150°C water, and/or a rate of decrease in mass of 5-100% subsequent to immersion for 72 hours in 150°C water, and more preferably one experiencing tensile strain at rupture of 50% or above at 66°C, compressive stress at 70% strain of 10 MPa or above, and compressive strain at rupture of 50% or above; a degradable seal member or protective member for a downhole tool comprising said member; a downhole tool such as a well-drilling plug; and a well-drilling method.
WELL TREATMENT METHOD BY DISINTEGRATING ELASTIC MATERIAL BY CONTACTING SEAL MEMBER FOR DOWNHOLE TOOLS COMPRISING ELASTIC MATERIAL WITH WELL TREATMENT FLUID
A well treatment method characterized by disintegrating an elastic material by contacting a seal member for downhole tools comprising the elastic material with a well treatment fluid (acids such as hydrochloric acid, formic acid, acetic acid, and hydrofluoric acid, alkalis, hot water, steam, organic solvents, and the like).
E21B 29/00 - Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
A degradable seal member for downhole tools, the member being a diameter- expandable annular seal member, the diameter-expandable annular seal member comprising: two or more annular members distributed along an axial direction, the annular members being formed from a degradable polymer material having hardness in a range from A60 to D80; a plug for well drilling; and a method for well drilling using the degradable seal member for downhole tools.
Provided is a degradable seal member for downhole tools, the member being formed from a degradable polymer material that is preferred to be a thermoplastic polymer material or a polymer material including an ester bond, an amide bond, or a urethan e bond, and that is further preferred to be a polymer material that contains an aliphatic polyester. It is preferred that the degradable seal member exhibits a bending elastic modulus of 0.01 to 8 GPa at 23°C, further preferred that a stable state is maintained in a dry environment and that degradation in a fluid of a temperature not less than 66°C is possible, and also preferred that a molded article has an annular shape. Also provided are a downhole tool such as a plug for well drilling and completion, an d a method of well drilling and completion.
A plug for well drilling includes a mandrel and at least one diametrically expandable annular rubber member and at least one slip disposed on an outer circumferential surface orthogonal to an axial direction of the mandrel; (i) the mandrel being formed from a degradable material; and (ii) the at least one diametrically expandable annular rubber member being formed from a degradable rubber material having a rate of decrease of not less than 5% in 50% strain compressive stress after immersion in water at a temperature of 150°C for 24 hours relative to the compressive stress before immersion; and/or having a rate of loss of mass of from 5 to 100% after immersion in water at a temperature of 150°C for 72 hours relative to the mass before immersion. A well drilling method includes a step of isolating a borehole using the plug for well drilling, part or all of the plug being degraded thereafter.
A ball sealer for hydrocarbon resource recovery, characterized by being obtained by coating a spherical core that comprises at least one layer comprising a disintegrable aliphatic polyester resin with a resin material that has higher impact resistance than the aliphatic polyester resin and by having a diameter of not less than approximately 25 mm (1 inch). This ball sealer has a large diameter, retains the property of being disintegrable after fracturing, and has impact resistance which makes the ball withstand high-velocity loading. The sealer is suitable for use in hydraulic fracturing, which is commonly used for recovering hydrocarbon resources including petroleum and gases. This large-diameter ball sealer can be efficiently formed with high dimensional accuracy by a method including at least one insert injection molding step.
A plug for mine-drilling provided with a mandrel and a member attached to an outer peripheral surface orthogonal to the axial direction of the mandrel, wherein the mandrel and/or the member is formed from a degradable material, and the plug for mine-drilling is further provided with a ring-shaped ratchet mechanism in which a plurality of meshing parts that allow movement in one direction along the axial direction of the member and restrict movement in the opposite direction are formed in the outer peripheral surface of the mandrel and the inner peripheral surface of the member, and preferably also a ring-shaped plate adjacent to the axial front of a pushing jig that encloses the ratchet mechanism. A mine-drilling method in which some or all of the plug for mine-drilling is degraded after the plug has been used for a mine-hole-filling process.
A plug for well drilling comprising a mandrel and members attached on an outer circumferential surface orthogonal to an axial direction of the mandrel. In such a plug for well drilling, at least the mandrel or one of the members is formed from a degradable material and a curvature radius of a bent portion thereof is from 0.5 to 50 mm. Additionally, a well drilling method using the plug for well drilling, the method comprising degrading a part or all of the plug for well drilling after blocking a borehole.
A rubber member for downhole tools, preferably a seal member, ball sealer, ball seat, or protecting member, of which a decrease rate of 50% strain compressive stress after immersion for 24 hours in 150°C water relative to 50% strain compressive stress before immersion is not less than 5%, and preferably not less than 50%; a downhole tool comprising the rubber member; and a method for recovering a hydrocarbon resource using the downhole tool.
A plug for well drilling process comprising: (a) a mandrel formed from a degradable material; (b) a pair of rings placed on an outer peripheral surface existing in the orthogonal to an axial direction of the mandrel, at least one of the rings being formed from a degradable material; and (c) at least one diameter-expandable circular rubber member placed at a position between the pair of rings on the outer peripheral surface existing in the orthogonal to the axial direction of the mandrel; the percentage of mass loss in the degradable material after immersion for 72 hours in water at a temperature of 150°C preferably being from 5 to 100%; and a well drilling method comprising the step of plugging well hole using the plug for well drilling process , wherein part or all of the plug for well drilling process degrades after the plugging.
A well treatment fluid material comprising: 100 parts by mass of a polyester resin containing 50 mass% or more of a lactic acid-type resin; and at least one decomposition accelerator selected from an organophosphorus compound in an amount of 0.01 to 10 parts by mass and a carboxylic acid anhydride in an amount of 10 to 50 parts by mass.
A poly-L-lactic acid (PLLA) solidified and extrusion-molded article which comprises a resin material containing a PLLA having a weight average molecular weight of 100,000 to 380,000, a melt viscosity (temperature: 240°C, shear rate: 120 sec-1) of 20 to 2,000 Pa*s and an L-form content of 80 to 100%, and has a thickness or diameter of 10 to 500 mm and tensile strength of 5 to 100 MPa at 66°C (wherein the article may additionally contain a filler; in this case, the tensile strength of the article may be 5 to 200 MPa); a downhole tool member or ball sealer for well drilling use, which is formed by machining the solidified and extrusion-molded article; a sealing plug equipped with the downhole tool member; a method for producing a PLLA solidified and extrusion-molded article, which comprises the steps of supplying a resin material containing a PLLA into an extruder, carrying out the solidification and extrusion molding of the resin material, pressurizing the resultant solidified and extruded product, and then drawing the pressurized product while applying a back pressure in the direction of a forming die to thereby prevent the expansion of the solidified and extruded product; and a well drilling method.
C08L 67/04 - Polyesters derived from hydroxy carboxylic acids, e.g. lactones
B29C 48/90 - Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
C08J 5/00 - Manufacture of articles or shaped materials containing macromolecular substances
Provided are: a polyglycolid acid (PGA) solidified extrusion that is formed from a resin material containing PGA having a weight average molecular weight of 100,000-300,000 and a melt viscosity (at a temperature of 270°C and a shear velocity of 120 sec-1) of 100-2,000 Pa·s and that has a tensile strength at a temperature of 150°C of 20-200 MPa; a down-hole tool for oil drilling or a member thereof formed by machining the solidified extrusion; a filling plug provided with the member; a filling plug core rod; and a method for producing the PGA solidified extrusion and a method for producing the down-hole tool or member thereof that contain a step for supplying the resin material to an extruder (preferably from a fixed-quantity feeder), and after solidifying/extruding, compressing the solidified extrusion and pulling while applying back pressure in the forming die direction, thus suppressing bulging of the solidified extrusion.
B29C 48/90 - Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
43.
POLYGLYCOLIC ACID RESIN COMPOSITION AND METHOD FOR PRODUCING THE SAME
A polyglycolic acid resin (PGA) composition which can be used as a packaging material or a material for a drilling downhole tool (member), said composition comprising 30 to 90 mass% of a PGA and 70 to 10 mass% of an inorganic filler, wherein the percentage of mass loss of the PGA after the immersion of the composition in water at a temperature of 120°C for 3 hours is 20% or more, preferably 25% or more, and the deflection temperature under load of the composition is 120°C or higher; and a method for producing a PGA composition, said method comprising a step of melt-kneading using an extruder.
A ball sealer for hydrocarbon resource collection, wherein: the ball sealer is obtained from a roughly spherical structure overall that has at least a two layer structure of a spherical core and a surface layer resin material covering same; at least the surface layer resin material thereof is obtained from a polyglycolic acid resin; and the diameter is about 25 mm (1 inch) or more. The ball sealer is manufactured with a method wherein: the spherical core is disposed substantially in the center of a metal mold cavity with support pins; in this state, the surface layer resin obtained from a polyglycolic acid resin is injection-molded around the core; and after retracting the support pins to the wall surface of the metal mold cavity synchronized with completion of the injection of the surface layer resin, the surface layer resin is cured. A large diameter ball sealer is thereby manufactured with a relatively simple process and with good dimensional accuracy, the ball sealer being suitable for use in hydraulic fracturing, which is widely used for collecting hydrocarbon resources such as petroleum and natural gas, and having a polyglycolic acid resin, which is a biodegradable resin with good mechanical strength and good dimensional designability, for at least the surface layer-configuring resin.
A downhole tool member for hydrocarbon resource recovery, comprising a shaped body of a polyglycolic acid resin blended with an inorganic or organic short fiber reinforcement material, and having thickness reduction rate characteristics when held in water at 120 °C , inclusive of: an initial thickness reduction rate (as an average for a holding period for 4 hours) which is at most 0.8 times that of a shaped body of the polyglycolic acid resin alone, and has a terminal thickness reduction rate (after the thickness decreases to 50% or less of an initial thickness) which is larger than 1.5 times the initial thickness reduction rate. As a result, it is possible to provide a downhole tool member, that is a temporary tool for formation or repair of downholes for recovery of hydrocarbon resources including oil and gas, or a part of the tool, which allows more accurate designing of collapse characteristics thereof.
C08L 67/04 - Polyesters derived from hydroxy carboxylic acids, e.g. lactones
C09K 8/88 - Compositions based on water or polar solvents containing organic compounds macromolecular compounds
E21B 29/00 - Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
E21B 33/13 - Methods or devices for cementing, for plugging holes, crevices, or the like
46.
MEMBER FOR HYDROCARBON RESOURCE COLLECTION DOWNHOLE TOOL
A member for a hydrocarbon resource collection downhole tool characterized: in being obtained from a molding of a polyglycolic acid resin with a weight average molecular weight of 70 thousand or more and with an effective thickness of ½ or more of the critical thickness for surface degradation; and in the rate of thickness reduction in water being constant with respect to time. As a result, more precise design of the strength and time until breakdown of the downhole tool member that forms part or all of a temporary use tool for forming or repairing downholes for collecting hydrocarbon resources such as petroleum and gasoline is made possible.
The present invention provides a polyester resin composition comprising: 100 parts by mass of a polyester resin having at least 50% by mass of a glycolic acid resin; and from 0.5 to 50 parts by mass of a carboxylic acid anhydride. The present invention makes it possible for the degradation of the polyester resin to proceed even at relatively low temperatures (e.g. less than 60°C, and preferably less than or equal to 50°C), and also makes it possible to control the degradation during storage. Since the polyester resin composition of the present invention exhibits excellent degradability at relatively low temperatures, the molded articles, such as short fibers, formed from such a polyester resin composition are advantageously used as a well-treatment fluid (e.g. sealers for fracturing fluids) that is suitable for drilling or completion of oil and gas recovery and the like.
A heat shrinkable multilayer film comprising an outer surface layer (a) formed of a thermoplastic resin, a first intermediate layer (b1) formed of a polyamide resin, a second intermediate layer (b2) formed of a saponified product of an ethylene-vinyl acetate copolymer, and an inner surface layer (c) formed of a polyolefin resin, wherein the shrink of the heat shrinkable multilayer film in water at 90°C is within a range of from 3 to 45% in each of machine and transverse directions, and the polyamide resin is a mixture of 60 to 90% by weight of an aliphatic polyamide having a melting point of 210°C or higher and 10 to 40% by weight of an aromatic polyamide comprising isophthalic acid and terephthalic acid as main components.
B32B 27/28 - Layered products essentially comprising synthetic resin comprising copolymers of synthetic resins not wholly covered by any one of the following subgroups
B65D 65/40 - Applications of laminates for particular packaging purposes
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