289 results about "Production string" patented technology

The invention relates to the technical field of oil and gas well exploitation, in particular to a jet flow drainage device in a deep well gas production pipe column and a using method. According to the technical scheme, a pressure-controlled switch jet suction pump and a reverse circulation drainage pump are connected and lowered into an oil pipe through a small-diameter oil pipe, the pressure-controlled switch jet suction pump is located on the upper middle portion of an oil-gas well, the reverse circulation drainage pump is located on the lower portion of the oil-gas well, a packer is installed below the reverse circulation drainage pump, and a check valve is installed at the bottom of the reverse circulation drainage pump; high-pressure gas is injected into the small-diameter oil pipe, water in a pipe column on the upper portion of the pressure-controlled switch jet flow suction pump is discharged, and after emptying, the sliding sleeve moves to close the mixed liquid outlet; then high-pressure gas is injected into an annular space between a casing pipe and an oil pipe, water in a pipe column on the upper portion of a reverse circulation drainage pump is drained, liquid in the pipe column is lifted through multi-stage relay jet flow, well bottom accumulated water and water stored in the pipe column are drained to the ground, the well bottom back pressure is effectively reduced, water blocking and water locking are relieved, and the gas well productivity is recovered.

The invention relates to an optimal design method for controlling leakage pressure rise of a production pipe column. The method comprises the steps that whether annulus liquid in an oil sleeve annulus of a target gas well leaks or not is determined; if the annulus liquid in the oil sleeve annulus of the target gas well does not leak, the depth of a leakage point of the production pipe column is determined; under the condition that the depth of the leakage point is determined, a first changing curve of the maximum pressure value of the oil sleeve annulus along with the annulus liquid density is determined; according to the pressure bearing capacity of an oil pipe head, a production pipe column, a production casing and a packer, a second changing curve of the maximum value of the pressure control range of the oil sleeve annulus along with the annulus liquid density is determined; and the annulus liquid density is optimized and determined according to the first change curve and the second change curve, so that the oil sleeve annulus pressure is reduced to be within a safety threshold value. The annular pressure of the oil sleeve can be reduced to be within the safety threshold value on the premise that a production pipe column is not replaced and a well is not overhauled, the pipe column leakage pressure rising phenomenon is effectively controlled, the phenomenon that the pressure bearing capacity of a shaft is exceeded is avoided, the control cost is reduced, and the maintenance period is shortened.

The invention discloses an oil well water control production pipe column assembly and a using method thereof, and solves the technical problems that the oil well filling efficiency is low, and liquid extraction and production are difficult to achieve at the last stage of production. The device comprises a central pipe, a plurality of bypass isolation packers and water control production assemblies, each water control production assembly comprises a plurality of double-layer screen sleeves and a plurality of water control production short sections, each water control production short section comprises an outer protective cylinder, a setting short section, an AICD valve and a circulating sliding sleeve, the setting short section, the AICD valve and the circulating sliding sleeve are sequentially connected, and the double-layer screen sleeves are connected with the double-layer screen sleeves. An annular flow channel is formed among the setting nipple, the AICD valve, the circulating sliding sleeve and the outer protective cylinder, the setting nipple is used for blocking the side, away from the circulating sliding sleeve, of the annular flow channel, a plurality of circulating holes are formed in the circulating sliding sleeve in a penetrating mode, and a control part used for controlling the circulating holes to be opened and closed at the same time is arranged in the circulating sliding sleeve. The liquid return flow of filling liquid can be increased, the filling efficiency is improved, and liquid extraction and production can be achieved.

The invention relates to the technical field of natural gas well exploitation, in particular to a water drainage, sand pumping and plug removal device for a power-free gas production pipe column and a using method. According to the technical scheme, the water inlet end of the lower portion of a nozzle is connected with a power water inlet formed in the outer wall of a pump body, a center pipe is arranged at the lower end of the nozzle, the water outlet end of the upper portion of the nozzle is communicated with a formation liquid inlet cavity, an expansion rubber barrel is arranged on the lower side of the pump body, and an upper pressure transmission hole is formed between the expansion rubber barrel and the center pipe; a slip rubber sleeve is arranged on the lower side of the pump body, a slip piece is arranged on the outer side of the slip rubber sleeve, a lower pressure transmission hole is formed between the slip rubber sleeve and the central pipe, and a formation liquid suction inlet is formed in the lower end of the pump body. A washing pipe is arranged at the bottom of the central pipe, and a sand suspending nozzle is arranged at the bottom of the washing pipe. The device has the beneficial effects that under the condition that a gas production pipe column is not moved, a continuous oil pipe is put into an inner cavity of the gas production pipe column to drive the device to pump sand, the sand pumping and plug removal requirements special for a natural gas well are met, and the well control safety and environmental protection problems of the natural gas well are avoided.

The invention belongs to the technical field of oil-gas field development, and discloses an intelligent separate mining process pipe column suitable for slim holes and an implementation method. The intelligent separate mining process pipe column comprises a sand control pipe column and a control pipe column, wherein the sand control pipe column comprises a sand control screen pipe located in an open hole section, a sand control top packer located at the front end of the sand control screen pipe and at least one open hole segmented sand control packer used for segmenting the open hole section to form a plurality of sub open hole sections; the bottom-hole regulator string at least comprises bottom-hole regulators located in all the sub open hole sections, electric control setting packers which are matched with the open hole segmented sand control packers in a setting mode and connected with the adjacent bottom-hole regulators, a lower intelligent node connected with the bottom-hole regulator at the foremost end and a releasing tool connected with the lower intelligent node; the production pipe column at least comprises an upper intelligent node and an electric submersible pump which are sequentially connected from bottom to top. The upper intelligent node is connected with the ground control device through a first steel pipe cable, the bottom-hole regulator is connected with the lower intelligent node through a second steel pipe cable, and the upper intelligent node penetrates through the releasing tool to be in magnetic coupling connection with the lower intelligent node.

A method includes lifting a first plunger within a production string disposed within a wellbore. The production string divides the production string into multiple stages. The plunger landing assemblies include a first landing assembly and an intermediate landing assembly. The lifting includes lifting the first plunger in a first stage to lift production fluid accumulated uphole of the first plunger. The method also includes continuing to lift the first plunger until the first plunger strikes the intermediate one of the plurality of landing assemblies, allowing the production fluid to flow past the second one of the plurality of landing assemblies into a second stage. The method also includes securing the first plunger and lifting, with the production fluid accumulated uphole of a second plunger residing in the second stage, the second plunger to lift the production fluid toward the wellhead.

An apparatus and a method for estimating a production flow rate at a certain position of a well, the apparatus has a compartment being in fluid communication with a fluid within a pipe for forming part of a production string via a first passage and a second passage. A portion of wellbore fluid within the pipe is urged through the compartment by a flow diverter provided at least at one of the at least first passage and the at least one second passage. A ratio between a flow (Fi, Fo) through the compartment and the flow (F) through the pipe is constant, wherein the constant ration is known from tests and / or calculations. A measured flow through the compartment is used for estimating a flow through the pipe of the apparatus.

The invention relates to the technical field of oil field water injection well downhole operation, in particular to a water injection well under-pressure operation process pipe column. The water injection well under-pressure operation process pipe column comprises a sleeve, an oil pipe penetrates through the sleeve, a blowout prevention working barrel, a production pipe column and a multifunctional blowout prevention tail pipe are sequentially arranged on the oil pipe from top to bottom, a screen pipe is arranged at the tail end of the oil pipe, and a guide cone is arranged below the screen pipe; a blowout prevention inner plug is arranged in the blowout prevention working barrel; the production pipe column comprises a plurality of matched packers for layering the pipe column, and each layer is provided with an anti-backflow water distributor with a one-way valve structure. The multifunctional blowout prevention tail pipe comprises a lower valve body capable of playing a role in blowout prevention and drainage and an upper valve body with a function of a two-way valve. The functions of water distributor blowout prevention and pipe column bottom blowout prevention and drainage in an oil pipe above a tool section are achieved through the blowout prevention working barrel, the backflow prevention water distributor and the multifunctional blowout prevention tail pipe. The upper valve body and the lower valve body are matched, so that the device has the secondary blowout prevention function, and the blowout prevention and drainage effects are achieved in the tubular column lifting process.

The invention relates to a compressed air energy storage horizontal well high-frequency injection and production pipe column and a well completion method, the injection and production pipe column is sequentially connected with an underground combined sealing device, an underground annulus flow limiting device and an underground safety valve through oil pipes from bottom to top, and the underground combined sealing device is formed by connecting a preset working barrel and a sealing working barrel in an inserted mode. A sealing insertion barrel seals a sealing insertion barrel sealing cavity of the preset lower outer barrel, a sealing assembly seals a sealing piece sealing cavity of the preset lower outer barrel, and the underground annulus flow limiting device is provided with a leather cup and a center pipe. And the flow limiting plates of the staggered converging flow channels are fixed in the flow limiting plate mounting grooves in the pipe wall of the central pipe, and a seat sealing hole and a seat sealing boosting hole are formed in the pipe wall without the flow limiting plate mounting grooves. The injection-production tubular column provided by the invention has a reverse well flushing function, scales and deposited wax in an oil pipe are cleaned through reverse circulation of well flushing fluid with a cleaning function, maintenance without moving the tubular column is realized, the conventional operation cost and time are reduced, and the working efficiency of a gas storage is improved.

The invention relates to a compressed air energy storage straight inclined shaft high-frequency injection and production string and a well completion method.The injection and production string is sequentially connected with an underground combined sealing device, an underground annulus flow limiting device and an underground safety valve through oil pipes from bottom to top, and the underground combined sealing device is formed by connecting a preset working barrel and a sealing working barrel in an inserted mode; a sealing insertion barrel seals a sealing insertion barrel sealing cavity of the preset lower outer barrel, a sealing assembly seals a sealing piece sealing cavity of the preset lower outer barrel, and the underground annulus flow limiting device is provided with a leather cup and a center pipe. And the flow limiting plates of the staggered converging flow channels are fixed in the flow limiting plate mounting grooves in the pipe wall of the central pipe, and a seat sealing hole and a seat sealing boosting hole are formed in the pipe wall without the flow limiting plate mounting grooves. The injection-production tubular column provided by the invention has a reverse well flushing function, scales and deposited wax in an oil pipe are cleaned through reverse circulation of well flushing fluid with a cleaning function, maintenance without moving the tubular column is realized, the conventional operation cost and time are reduced, and the working efficiency of a gas storage is improved.

A method includes deploying a plunger from a wellhead to a downhole location of a production string fluidly coupled to the wellhead and disposed within a wellbore, the plunger including a plunger sensor and the production string including a plurality of sensors. The method includes sensing, by the plunger sensor, the plurality of sensors as the plunger moves in a downhole direction. The method also includes lifting the plunger and sensing, by the plunger sensor, the plurality of sensors as the plunger moves in an uphole direction. The method also includes determining, as a function of sensor feedback from the plunger sensor, at least one parameter of the plunger. The method also includes controlling, as a function of the parameter of the plunger, a valve fluidly coupled to the wellhead to control a parameter of a present or subsequent plunger lift cycle operation.

The invention discloses a production sliding sleeve, a production tubular column and a production method for a high-temperature gas well of an offshore oilfield. The technical problems that opening and closing control of the production sliding sleeve is tedious, and the adaptability of the production tubular column is poor are solved. The production sliding sleeve comprises a sliding sleeve body of a cylinder structure; the upper joint is arranged at the top of the sliding sleeve main body; the production hole is formed in the sliding sleeve main body; the control cylinder is arranged in the sliding sleeve main body in a sliding manner; the opening hole is formed in the control cylinder; the opening part is used for controlling the sliding sleeve main body to move downwards and enabling the opening hole to be aligned with the production hole; and the closing part is used for controlling the sliding sleeve main body to move upwards and enabling the opening hole and the production hole to be staggered. The structure of the produced sliding sleeve is optimized, rapid and convenient opening and closing control of the produced sliding sleeve is achieved, limitation of well types and well deviation is avoided, the use adaptability is improved, the production method is simpler, and the operation convenience and the operation time efficiency can be improved.

The invention relates to the technical field of oil and gas field development, in particular to an ultra-deep gas well production string multi-mode leakage simulation experiment device and method. According to the technical scheme, the outer side of a shaft temperature and pressure coupling simulation system is connected with a reservoir gas supply simulation system, the middle of the shaft temperature and pressure coupling simulation system is provided with a multi-mode leakage simulation assembly, the lower end of a production oil pipe is connected with a reservoir-shaft coupling connector, and the upper portion of one side of a layered sand filling seepage tank of the reservoir gas supply simulation system is connected with a confining pressure loading unit through a pipeline; the lower portion of the layered sand filling seepage tank is connected with a reservoir fluid supply unit, and the outlet end of the layered sand filling seepage tank is connected with a reservoir-shaft coupling connector through a pipeline. The experimental device has the beneficial effects that the experimental device for coupling the reservoir and the shaft is constructed, and the multi-mode leakage simulation assembly is adopted to realize body perforation leakage simulation and screw thread sealing failure simulation, so that the simulation of the ultra-deep gas well under complex working conditions is realized, and a scientific basis and a technical support are provided for leakage prevention and control of a production string of the ultra-deep gas well.

The water controlling and oil stabilizing device comprises a Tesla valve body fixedly arranged between an upper connector and a lower connector, a Tesla flow channel is formed in the outer wall of the Tesla valve body, and the outer wall of the Tesla valve body is sleeved with an outer barrel used for sealing the Tesla flow channel; the Tesla valve body is provided with a fluid through hole which is communicated with the upper end of the Tesla flow channel and a central flow channel of the Tesla valve body; a sand control pipe is fixedly arranged between the outer barrel and the lower connector, the lower end of the Tesla flow channel is communicated with an annular space among the outer barrel, the sand control pipe and the Tesla valve body, and a fluid channel communicated with the annular space and the outer space of the sand control pipe is arranged on the sand control pipe. By adopting the Tesla flow channel, the retarding effect of the Tesla flow channel on high water content is greater than that of low water content, so that the water content of a total product in an oil pipe is indirectly reduced, and low-cost control of the water content of the product is realized.

The invention relates to the technical field of compressed air energy storage salt cavern engineering, and provides a compressed air energy storage salt cavern cavity air-tight seal monitoring method and system, and the method comprises the steps: S1, monitoring preparation; s2, sealing and monitoring brine; s3, gas seal monitoring of the injection-production string; s4, open hole section air-tight seal monitoring; when the three kinds of monitoring meet the requirements at the same time, it is judged that the air sealing performance of the compressed air energy storage salt cavern cavity is qualified. The system comprises an injection and production pipe column, a test pipe column, a first pressure gauge, a second pressure gauge, a packer, a salt cavern cavity brine sealing performance monitoring unit, an injection and production pipe column gas sealing performance monitoring unit and a well body open hole section sealing performance monitoring unit. The method is suitable for air-tight seal monitoring of the compressed air energy storage salt cavern gas storage, the mode that a neutron source is used for measuring a gas-liquid interface is not used, the monitoring process is optimized, monitoring indexes are quantified, it is ensured that the salt cavern cavity sealing performance meets the sealing requirement of compressed air energy storage gas storage engineering, and the engineering utilization efficiency is improved.

A method includes deploying a plunger from a wellhead to a downhole location of a production string fluidly coupled to the wellhead and disposed within a wellbore. The plunger includes a collar detector attached to a body of the plunger and the production string includes a plurality of collar. The method includes detecting, by the collar detector, the plurality of collars as the plunger moves along the string, generating, by a circuitry module of the collar detector, a first plurality of timestamps each associated with a respective collar. The method also includes determining, as a function of the timestamps, at least one parameter of the plunger, and controlling, as a function of the parameter of the plunger, a valve fluidly coupled to the wellhead to control a parameter of a plunger lift cycling operation.

The invention provides a shaft blockage position detection method which comprises the following steps: determining the leakage depth and collapse depth of a production pipe column after the leakage and collapse of the production pipe column are judged; dividing the production pipe column into a plurality of first sub-production pipe columns; the dynamic pressure in the first sub-production pipe column is calculated; the pressure, corresponding to the production pipe column, of the throttled production pipe column and the temperature, corresponding to the production pipe column, of the throttled production pipe column are determined; according to the pressure of the production pipe column after throttling and the temperature of the production pipe column after throttling, the blocking position and wellhead calculation pressure of the corresponding production pipe column are determined; judging whether the production pipe column meets collapse conditions or not according to the dynamic internal pressure of the first sub-production pipe column and the calculated pressure of the wellhead; and if it is judged that the production pipe column meets the collapse condition, the blockage position of the production pipe column is output, so that the wellbore blockage position can be detected, and the blockage condition of the wellbore blockage position can be determined.

The invention relates to a production string leakage positioning method. The method comprises the steps that an initial pressure stable value of an oil sleeve annulus and a pressure fluctuation value of the oil sleeve annulus are obtained; calculating a pressure fluctuation threshold value of the oil jacket annulus according to the initial pressure stable value and the sensor monitoring error; the pressure fluctuation value is compared with a pressure fluctuation threshold value, and whether a new leakage point appears or not is judged; if no new leakage point appears, the depth of the leakage point is calculated according to the U-shaped pipe pressure balance principle, and a positioning result is obtained; and operating oil pressure fluctuation based on a positioning result to obtain an oil pressure fluctuation calculation value, and comparing the oil pressure fluctuation calculation value with an actually-monitored oil pressure fluctuation monitoring value to judge the positioning reliability. According to the method, the leakage point position is determined and the positioning result is verified by judging the state of the leakage point of the production pipe column in advance, so that the positioning precision is improved, the leakage pressure rising phenomenon of the production pipe column is effectively controlled, and the working efficiency is improved.

The utility model relates to an anti-slip device for an oil and gas well, which comprises a connecting pipe and an anti-slip mechanism arranged in the connecting pipe, oil and gas channels are arranged at the center of the connecting pipe and the center of the anti-slip mechanism, and a plurality of anti-slip flow channels are further arranged on the anti-slip mechanism. And the anti-slip flow channel is communicated with the oil gas channel through a plurality of liquid inlets and an annular liquid outlet. The device has no moving parts, is not easy to damage, does not occupy a central channel of a production pipe column, can prevent a liquid column from slipping without external force operation, greatly reduces the cost of oil and gas exploitation, and prolongs the service life of the production pipe column.

The present invention relates to a system and a pressure activated valve for preventing fluid from passing through an ICD during installation and commissioning of a production string in a well bore. Further the invention relates to a method for operating the pressure activated valve. The pressure activated valve can be arranged outside the production string being configured to hinder fluid from entering the ICD from a reservoir when the pressure activated valve is closed and to allow fluid from entering from the reservoir when pressure activated valve is open.

There is provided a flow diverter for integration within a production string that is emplaced within a wellbore for effecting separation of reservoir fluid into gas-depleted reservoir fluid and gas-enriched reservoir fluid. The flow diverter is configured for, amongst other things, mitigating corrosion and erosion phenomena.

The invention discloses a method for replacing a slip type wellhead casing hanger, which relates to the technical field of petroleum wellhead equipment, and comprises the following steps of: 1, killing a well, pulling out a production pipe column, and detaching a Christmas tree and a gas production four-way joint; 3, loosening a screw of the inverted slip, and dismantling a base, connected with the casing, of the first-stage casing head; fourthly, a 10 cm annular groove is cut downwards at the position 2-3 m below the connecting position of the surface layer casing pipe and the casing pipe; fifthly, the casing head is knocked downwards, so that the casing head is separated from the slip connected with the upper production casing; sixthly, a slip in the casing head is taken out; and seventhly, the casing head is taken out, and the surface casing is cut and polished again. According to the slip type wellhead casing hanger replacing method, an old oil and gas well casing head, connected through a slip type hanger, of a production casing can be replaced with a high-pressure-grade casing head, the requirement of a new technology is met, and the purpose that an old well hole is reused is achieved.

The present invention addresses to a method of removing scale from the DHSV of the oil production string aiming at maintaining the production of the wells and thus avoiding the loss of production. First, a neutralizing solution is placed in the service line, before pumping the scale removing solution through the string to act on the DHSV. Next, the acid is pumped into the production string to react with the calcium carbonate scale. After the time for the dissolution of the scale inside the DHSV, the well is opened for production by the service line. The spent acid is mixed with the neutralizing solution inside the service line, reducing its corrosiveness in relation to the service line, contributing to its preservation.

The present invention discloses an oil well water control production string assembly and a method for using the same, which solves the technical problems of low filling efficiency of oil wells and difficulty in achieving liquid production at the end of production. The device includes a central pipe, multiple bypass isolation packers, and a water control production assembly. Each water control production assembly includes multiple double-layer screen sleeves and multiple water control production short sections. Each water control production short section includes an outer casing, a sealing short section, an AICD valve, and a circulation sleeve. The sealing short section, the AICD valve, and the circulation sleeve are connected in sequence and coaxially located inside the outer casing. An annular flow channel is formed between the sealing short section, the AICD valve, the circulation sleeve, and the outer casing. The sealing short section is used to seal the annular flow channel away from the side of the circulation sleeve. The circulation sleeve is provided with multiple circulation holes, and a control unit for controlling the simultaneous opening and closing of multiple circulation holes is provided inside the circulation sleeve. The present invention can increase the return flow rate of the filling liquid, improve the filling efficiency, and achieve liquid production.

The invention relates to the technical field of petroleum separate recovery, in particular to an under-pump interactive intelligent separate recovery system and an implementation method thereof. The method comprises the steps that firstly, at least one bottom-hole regulator packing assembly, an electric energy interaction receiving end and a releasing anchor are sequentially arranged from bottom to top through a tubular column; secondly, after a wellhead is pressed and a packer is set, all production layers are packed; the wellhead continues to be pressurized, the releasing anchor conducts releasing anchoring to achieve anchoring of the production allocation tubular column, then the releasing anchor conducts releasing disengaging to achieve hanging of the production allocation tubular column, and at the moment, the releasing anchor is pulled out so that the tubular column can be released; thirdly, the electric energy interaction transmitting end, the electric submersible pump and the oil pipe telescopic adjuster are sequentially connected from bottom to top; when the production tubular column is slowly lowered and the lowering position approaches to the butt joint position of the electric energy interaction transmitting end and the electric energy interaction receiving end, a wellhead oil pipe telescopic adjuster is adjusted through a ground controller, so that a wellhead oil pipe has the well completion length, and meanwhile, the hanging load of the pump hanging tubular column is controlled to meet the axial load capable of being borne by the electric submersible pump.

The invention relates to the technical field of oil field oil production engineering, in particular to an oil well intelligent balanced production pipe column and a construction method. Comprising a guide screwed plug, an oil pipe, a balanced production tool, a layered packer, an oil well pump, a cable and a ground control system. The guiding plug is located at the lowest end of the tubular column string, the balanced production tools and the layered packer are connected in series through the oil pipe, the layered packer is used for separating oil layers, and the cable is connected with the balanced production tools, can penetrate through the layered packer and is finally connected to the ground control system. According to the bottom-hole regulator disclosed by the invention, the bottom-hole regulator is quickly regulated by adopting a design mode of an underground electric control liquid path channel, hydraulic direct pushing and multiple tracks; the mode that a motor controls liquid path pressurization and underground liquid path rapid pressure relief is adopted, and rapid response of the bottom-hole regulator is achieved; a variable-density liquid inlet hole adjusting mode is adopted, and linear adjustment under multiple underground rails is achieved; a multi-stage inner vulcanization sealing mechanism is arranged underground, and the problem that a sealing piece is prone to damage under high pressure is solved.

The present application relates to the technical field of deep well natural gas exploitation, and particularly relates to an oil and foam removal separation device and a use method. The device comprises an inertial separator and a cyclone sand remover. The inertial separator comprises an inertial chamber, a conical tube and a gas distribution cone. The conical tube is located in the inertial chamber, the uphole section of the production string penetrates the bottom plate of the inertial chamber and is fixedly connected with the small end of the conical tube. The tip of the gas distribution cone is inserted into the large end of the conical tube, and there is a gap between the conical surface of the gas distribution cone and the inner wall of the conical tube. The other end of the gas distribution cone is provided with a connecting part which is fixedly connected to the top plate of the inertial chamber. The gas inlet pipe of the cyclone sand remover penetrates the top plate and is connected to the side of the connecting part which is towards the inside of the gas distribution cone. The device can avoid the rock and soil debris from entering the cyclone sand remover, thereby avoiding the impact damage of the rock and soil debris to the cyclone sand remover, and can also realize the continuous exploitation and separation of the deep well raw gas.

The application provides a wellbore safety experiment device and method for electric heating in-situ exploitation of oil shale, and the wellbore safety experiment device comprises a thermal insulation layer, a simulated injection-production assembly arranged outside the thermal insulation layer, and oil shale raw rock, a simulated wellbore assembly, a simulated production pipe column assembly and a first stress collection assembly arranged in the thermal insulation layer. The sealed cavity is heated by an electric heater, heat is transmitted to the oil shale raw rock through the oil pipe, the casing and the closed wellbore, the cracked product of the oil shale raw rock after being heated and cracked flows into the oil pipe through the product channel, the cracked product in the oil pipe is collected through the simulated injection-production assembly, the temperature in the oil pipe is collected through the first temperature sensor, the stress borne by the casing and the oil pipe at different positions is collected in real time through the first stress collection assembly, the real downhole in-situ exploitation process is simulated, the safety of the casing and the oil pipe can be evaluated in advance before downhole exploitation, and the safety and reliability of the casing and the oil pipe during downhole exploitation can be ensured.

A tubing isolation valve configured to permit lowering thereof downhole and installation in an existing pump seating nipple at a distal end of a production string. An elongate mandrel having at least 2 ports is slidably positioned in a hollow seal sub. A portion of the resulting assembly is positionable via a landing tool within the pump seating nipple. The mandrel is slidably moveable within the seal sub and pump seating nipple, from a first open position where fluids can be pumped from the wellbore via a pump fluidly connected to the landing tool, to a second closed position where fluids are isolated from the production tubing. Configurations of and methods of installing and operating the isolation valve when for example removing a pump from the well, and for removing the isolation valve completely from pump seating nipple and wellbore if desired, are further disclosed.

The invention relates to an oil well intelligent separate production system based on flow wave coding control and an implementation method.The oil well intelligent separate production system based on flow wave coding control comprises a plurality of intelligent separate production devices and packers which are alternately arranged in the axial direction of an oil well, and the intelligent separate production devices and the packers are connected through production pipe columns; the production pipe column is connected with an oil conveying pipeline, and the oil conveying pipeline is provided with a flow wave generator used for generating flow fluctuation of a certain rule. The flow generator is adopted to generate the regular flow waves, the valve opening degree of the intelligent separate recovery device is wirelessly controlled through the regular flow waves, allocation is performed according to the water outlet condition of each oil layer, the opening degree of the bottom-hole regulator corresponding to each production layer is controllably adjusted, and therefore fine adjustment and control of the liquid production capacity are achieved, the construction process is simple, and the cost is low. The working intensity is reduced, the construction cost of an oil well is reduced, and the crude oil exploitation efficiency is improved.