CN111005700B - Quick-release hydraulic control packer and construction method - Google Patents
Quick-release hydraulic control packer and construction method Download PDFInfo
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- CN111005700B CN111005700B CN201811175157.2A CN201811175157A CN111005700B CN 111005700 B CN111005700 B CN 111005700B CN 201811175157 A CN201811175157 A CN 201811175157A CN 111005700 B CN111005700 B CN 111005700B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/128—Packers; Plugs with a member expanded radially by axial pressure
- E21B33/1285—Packers; Plugs with a member expanded radially by axial pressure by fluid pressure
Abstract
The invention discloses a quick-release hydraulic control packer and a construction method thereof. The deblocking assisting mechanism is a polymer memory material deblocking assisting sleeve or a rigid spring. The device is through setting up helping hand deblocking mechanism, and the help setting piston return adds pressure relief device simultaneously, realizes the quick release of pressure in the pit, reaches the purpose of quick deblocking.
Description
Technical Field
The invention relates to an underground layering tool for petroleum exploitation, in particular to a quick-release hydraulic control packer and a construction method.
Background
The existing hydraulic control measurement and regulation integrated water injection technology is a dominant mode for offshore oilfield water injection development and has multiple advantages of ground pressure control, monitoring and dynamic pressure compensation. With the further increase of the application scale, the hydraulic control packer has the phenomenon of incomplete deblocking in different degrees, and particularly has the prominent situation for the stratum with serious stratum depletion, and the main reason is that the hydraulic control pipeline liquid column pressure is difficult to release, and the setting piston is difficult to return to the initial position. According to statistics, when in site construction, the deblocking time of the hydraulic control packer is basically over 24 hours, and for a low-pressure block, the friction resistance of a pipeline is overcome by means of the elasticity of a rubber sleeve, so that longer deblocking time is needed. For offshore operation and construction, a large amount of manpower and material resources are required for operation. Therefore, the quick-release hydraulic control packer is designed, and the quick release of the packer in various oil reservoir environments is particularly important.
A Polymer Memory material, i.e., a Shape Memory Polymer (SMP), also called a Shape Memory Polymer, refers to a Polymer material that can restore its original Shape after a product with the original Shape is fixed and its original condition is changed under a certain condition, and then stimulated by an external condition (such as heat, electricity, light, chemical induction, etc.). Shape Memory Polymer (SMP) is a new kind of functional polymer material, a new branch point for polymer material research, development and application, and it has both plastic and rubber properties. With the deepening of the understanding of the structure and characteristics of the polymer and the development of the polymer synthesis technology, it is realized that the polymer material obtains the expected structure and performance through molecular design. Shape memory polymer is a kind of polymer material obtained by using modern polymer physics theory and polymer synthesis and modification technology to make molecular combination and modification of general polymer material, such as polyethylene, polyisoprene, polyester, copolyester, polyamide, copolyamide and polyurethane, etc. to make them undergo the process of molecular design and molecular structure regulation, under a certain condition they are endowed with a certain shape (initial state), and when the external condition is changed, it can change the shape and fix it (morphosis). If the external environment changes again in a specific way and regularly, they can be reversibly restored to the initial state. At this point, the cycle of memory initial state-fixed morphism-recovery initial state is completed. There are 4 commercial technologies available in Japan for the production of SMP, namely polynorbornene, polyurethane, high trans polyisoprene, and styrene, 7-butadiene copolymer. Other types include fluorine-containing resins, polycaprolactone, polyamide, and the like.
Through retrieval, patent application number 201310739228.8 that discloses on 10.6.2015 discloses an independent hydraulic control type compression packer, including the center tube and install upper and lower coupling respectively in the center tube upper and lower extreme, connect into whole back inner chamber and form the water injection passageway that link up, and a support cover is established to the center tube outside suit, forms annular channel with the center tube, and upper and lower coupling is equipped with hydraulic control pipeline passageway respectively, communicates with annular channel. The pressure release channel of this packer is independent with the water injection passageway, greatly reduced the operation in-process packing element scrape the risk of back liquid accuse inefficacy, but this packer in practical application, there is ageing phenomenon in the packer packing element, causes residual deformation easily, the deblocking is comparatively difficult, does not reach the purpose that the pit shaft was washd to big discharge capacity.
Through retrieval, patent application number 201610885077.0 that discloses of 2018, 4, 17 discloses an independent hydraulic control packer pressure control valve, including the center tube, the overcoat, the check valve, pressure relief device, the overcoat sky cover forms the hydraulic control oil stream annular space outside the center tube and between the two, center tube upper end outer wall sets up the annular platform of evagination, the overcoat upper end is connected at the annular platform outer wall, the annular platform sets up solitary axial hydraulic oil passageway in, the independent axial hydraulic oil passageway down is seted up to the overcoat lower extreme, go up hydraulic oil passageway, lower hydraulic oil passageway all with the annular space intercommunication of hydraulic control oil stream, the check valve that can only flow down is connected to last hydraulic oil passageway port down, the center tube outer wall still is provided with pressure relief device. This device is most similar to the present invention, but the present invention has significant drawbacks. Firstly, after the check valve is closed, high pressure can be formed in the annular cavity, and at the moment, even if liquid is injected from the annular space, because the liquid compression coefficient is very small, the pressure relief channel is difficult to open through the piston, and the purpose of pressure relief cannot be achieved by only using the mode; secondly, the sealing connection part of the structure is more, a set of device is required to be added, and the operation cost is additionally increased.
Disclosure of Invention
The invention aims to provide a quick-release hydraulic control packer and a construction method.
In order to achieve the purpose, the invention adopts the following technical scheme that the quick-release hydraulic control packer comprises a central pipe, a setting mechanism, a pressure release mechanism and a release boosting mechanism, wherein the setting mechanism and the pressure release mechanism are sleeved on the central pipe, the upper end of the setting mechanism is connected with the pressure release mechanism through a connecting sleeve, and the release boosting mechanism is sleeved in an annulus formed between the connecting sleeve and the central pipe.
The deblocking assisting mechanism is a polymer memory material deblocking assisting sleeve or a rigid spring.
The setting mechanism includes piston, packing element, adjustable ring, the piston slidingtype suit is at the center tube outer wall, the packing element suit is at the piston outer wall, and the adjustable ring is connected to the packing element upper end, and the adjustable ring upper end is connected with connecting sleeve thread formula, and the packing element lower extreme top is on the reducing step that the piston outer wall was seted up, the piston upper end stretches into in the annular space that constitutes between adapter sleeve and the center tube.
The rubber cylinders comprise two or more than two stages of rubber cylinders, and a spacing ring is arranged between every two rubber cylinders; the lower end of the central pipe is connected with a lower joint, the lower joint is provided with a lower joint axial pressure transmission channel which is eccentrically and axially communicated, and the upper end of the lower joint axial pressure transmission channel is communicated to the lower end surface of the piston; the piston lower extreme stretches into the lower clutch inner wall, the piston still fixes on the lower clutch through sitting to seal the shear pin, set up polytetrafluoroethylene packing ring and sealed O circle between piston outer wall and the lower clutch inner wall.
The pressure relief mechanism comprises an upper joint, a plunger, a sliding sleeve and a small spring, the lower end of the lower joint is in a threaded connection with a central pipe, the lower joint is respectively provided with a hydraulic channel and a pressure relief channel in the eccentric axial direction, the bottom of the hydraulic channel is communicated with the bottom of the pressure relief channel, the bottom of the hydraulic channel is also communicated with an annulus formed between the connecting sleeve and the central pipe, the plunger and the sliding sleeve are both arranged in the pressure relief channel in a sliding sealing manner, the lower end of the sliding sleeve is connected with the small spring, the plunger is arranged above the sliding sleeve, the upper port of the pressure relief channel is a pressure relief channel interface, the inner wall of the pressure relief channel interface is provided with a jackscrew which is used for connecting a pressure relief pipeline, the upper port of the hydraulic channel is a hydraulic control pipeline interface, the hydraulic control pipeline interface is connected with the hydraulic pipeline, the lower joint is provided with a pressure relief outlet which is communicated with the pressure relief channel, and the sliding sleeve seals and releases the pressure relief outlet, the pressure release through-hole is seted up to the sliding sleeve, and pressure release through-hole lower extreme intercommunication pressure release passageway, pressure release through-hole upper end radially turns round to communicate to the sliding sleeve external.
The upper end of the upper joint is connected with a coupling.
In order to achieve the purpose, the invention adopts the following technical scheme that the construction method of the hydraulic control packer capable of being rapidly unsealed adopts the following method that liquid in a hydraulic channel pushes a piston to move upwards to cut a sealing shear pin, the sealing shear pin is continuously moved upwards to compress a rubber sleeve to complete the sealing of all the hydraulic control packers so as to realize layered water injection, at the moment, when a reverse well is needed, a ground hydraulic control pipeline is decompressed, because the rubber sleeve of the hydraulic control packer is not thoroughly unsealed, water is injected from an oil sleeve ring to throttle at the uppermost packer, turbulence is finally formed, a plunger is pushed to compress a small spring to drive the sliding sleeve to move downwards, when a decompression through hole in the plunger is superposed with a decompression outlet, the liquid in a decompression channel flows to a stratum from the uppermost packer until the internal pressure and the oil sleeve pressure reach a balanced state, at the moment, whether the backwashing pressure is reduced or not is observed, whether the hydraulic control packer is thoroughly unsealed or not is preliminarily judged, and if the ideal effect is not reached, the high-temperature underground trigger fluid can be injected into a shaft, when the underground temperature reaches 120 ℃, the polymer memory material in the hydraulic control packer can be quickly unsealed to start the thixotropic process, and the initial memory shape of the polymer memory material is recovered, namely the memory material axially stretches and radially contracts in an annular space, and the piston is stably pushed to move downwards by the shape change, so that the power-assisted packer rubber barrel is unsealed.
In order to achieve the purpose, the invention adopts the following technical scheme that the construction method of the hydraulic control packer capable of being rapidly unsealed adopts a construction method of the hydraulic control packer capable of being rapidly unsealed, liquid in a hydraulic channel pushes a piston to move upwards, a sealing shear pin is cut off, the rubber sleeve is continuously moved upwards to compress the rubber sleeve to complete the sealing of all the hydraulic control packers, and layered water injection is realized, at the moment, when a reverse well is required to be washed, a ground hydraulic control pipeline is decompressed, the piston is pushed to move downwards under the action of a rigid spring, at the moment, oil sleeve annulus water injection is observed on the outlet condition of an oil pipe, if the outlet condition is smaller or not, the rubber sleeve of the hydraulic control packer is not unsealed completely, the oil sleeve annulus injection pressure is continuously increased, the injected water is throttled at the uppermost packer, turbulence is finally formed, a plunger is pushed, a small spring is compressed to drive the sliding sleeve to move downwards, when a decompression through hole in the plunger is coincided with the outlet, the decompressed liquid in the decompression channel flows to the stratum from the top, until the internal pressure and the oil jacket pressure reach an equilibrium state.
Compared with the prior art, the invention has the following beneficial effects:
(1) the device is provided with a deblocking booster mechanism and a sliding sleeve decompression combination mode, so that the purpose of rapid deblocking can be realized;
(2) the packer integrates setting and quick unsetting, so that the service performance of the tool is improved;
(3) preferably, the memory and restoring force of a certain polymer memory material are kept above 95%, the transition temperature is controlled to be about 120 ℃, and the temperature adaptability is good.
Drawings
FIG. 1 is a schematic diagram of a quick unset hydraulic control packer according to the present invention;
FIG. 2 is a cross-sectional view A-A of the quick unset hydraulic control packer of the present invention;
FIG. 3 is an enlarged view of the quick unset hydraulic control packer at point B;
FIG. 4 is a schematic structural diagram of the polymer-based memory material of the present invention during installation;
FIG. 5 is a schematic structural diagram of the polymer-based memory material of the present invention at a temperature higher than the transition temperature;
FIG. 6 is another schematic diagram of the quick unset hydraulic control packer of the present invention.
In the figure: the sealing device comprises a coupling 1, an upper connector 2, a polymer memory material deblocking assisting sleeve (or a rigid spring) 3, a central pipe 4, a connecting sleeve 5, an adjusting ring 6, a rubber cylinder 7, a spacer ring 8, a piston 9, a setting shear pin 10, a polytetrafluoroethylene gasket 11, a sealing O-ring 12, a lower connector 13, a hydraulic control pipeline interface 201, a pressure relief channel interface 202, a hydraulic channel 203, a jackscrew 204, a plunger 205, a pressure relief through hole 206, a pressure relief outlet 207, a sliding sleeve 208, a small spring 209 and a pressure relief channel 210.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 5, the present invention provides a technical solution: a quick-release hydraulic control packer comprises a setting mechanism, a pressure release mechanism and a release boosting mechanism. The setting mechanism and the pressure relief mechanism are all sleeved on the central tube 4 and further comprise a deblocking power-assisted mechanism, the upper end of the setting mechanism is connected with the pressure relief mechanism through a connecting sleeve 5, and the deblocking power-assisted mechanism is sleeved in an annular space formed between the connecting sleeve and the central tube.
The deblocking booster mechanism is a polymer memory material deblocking booster sleeve or a rigid spring 3.
The setting mechanism includes piston 9, packing element 7, adjustable ring 6, the piston slidingtype suit is at the center tube outer wall, the packing element suit is at the piston outer wall, and the adjustable ring is connected to the packing element upper end, and the adjustable ring upper end is connected with the connecting sleeve thread formula, and the packing element lower extreme top is on the reducing step that the piston outer wall was seted up, the piston upper end stretches into in the annular space that constitutes between adapter sleeve and the center tube.
The rubber cylinders comprise two or more than two stages of rubber cylinders, and a spacing ring 8 is arranged between every two rubber cylinders; the lower end of the central pipe is connected with a lower joint 13, the lower joint is provided with a lower joint axial pressure transmission channel which is eccentrically and axially communicated, and the upper end of the lower joint axial pressure transmission channel is communicated to the lower end surface of the piston; the piston lower extreme stretches into the lower clutch inner wall, the piston still fixes on the lower clutch through setting up and sealing shear pin 10, polytetrafluoroethylene packing ring 11 and sealed O circle 12 between piston outer wall and the lower clutch inner wall.
The pressure relief mechanism comprises an upper connector 2, a plunger 205, a sliding sleeve 208 and a small spring 209, the lower end of the lower connector is in threaded connection with a central tube 4, the lower connector is respectively provided with an eccentric axial hydraulic channel 203 and a pressure relief channel 210, the bottom of the hydraulic channel is communicated with the bottom of the pressure relief channel, the bottom of the hydraulic channel is also communicated with an annular space formed between the connecting sleeve and the central tube, the plunger and the sliding sleeve are both arranged in the pressure relief channel in a sliding and sealing manner, the lower end of the sliding sleeve is connected with the small spring, the plunger is arranged above the sliding sleeve, the upper port of the pressure relief channel is a pressure relief channel interface 202, the inner wall of the pressure relief channel interface is provided with a jackscrew 204 which is used for connecting a pressure relief pipeline, the upper port of the hydraulic channel is a hydraulic control pipeline interface 201, the hydraulic control pipeline interface 201 is connected with a hydraulic pipeline, the lower connector is provided with a pressure relief outlet 207 which is radially communicated with the pressure relief channel, the sliding sleeve carries out shutoff and release to the pressure release export, pressure release through-hole 206 is seted up to the sliding sleeve, and pressure release through-hole lower extreme intercommunication pressure release passageway, the radial turn intercommunication of pressure release through-hole upper end are to the sliding sleeve external world.
The upper end of the upper joint is connected with a coupling 1.
The small spring is arranged at the bottom end of the pressure relief channel, the sliding sleeve is arranged at the upper end of the pressure relief channel, the sliding sleeve is provided with a radial pressure relief through hole, the pressure relief outlet is arranged outside the upper joint, the plunger is arranged at the upper end of the sliding sleeve, and the jackscrew is in threaded connection with the upper joint.
Referring to fig. 3, the hydraulic channel 203 and the pressure relief channel 210 are both in communication with the annulus, and when the pressure relief through hole inside the plunger coincides with the pressure relief outlet, the liquid in the pressure relief channel will flow to the ground from there, so as to achieve the purpose of pressure relief.
The setting mechanism comprises a piston, an adjusting ring, a spacer ring and the like; the deblocking booster mechanism can be a common rigid spring, and particularly can be a preferable polymer memory material which keeps a free state when the packer is set, but when deblocking is needed, the temperature in a well is increased to reach the transition temperature of the material, the memory shape of the material is recovered, a certain length can be extended, and after the deblocking is performed, the piston is pushed to reset, so that the boosting deblocking purpose is achieved; all the sealing joints, the piston, the plunger and the sliding sleeve are provided with the polytetrafluoroethylene gasket and the sealing O ring for sealing; the upper joint is provided with a drilling fluid control pipeline interface and a pressure relief channel interface; the lower joint is provided with a drilling fluid control pipeline interface.
Coupling and top connection threaded connection, the top connection with center tube threaded connection, adapter sleeve and top connection threaded connection, polymer class memory material (or stiff spring) arrange the adapter sleeve inside, adjustable ring and adapter sleeve threaded connection, packing element, spacer ring, packing element arrange the piston outside in proper order, the piston arrange the center tube outer end in, lower clutch and center tube threaded connection, the piston is temporarily fixed through the seat shear pin with the lower clutch simultaneously.
The quick-release hydraulic control packer is completely assembled according to the requirements, the packer and a common liquid packer are put into a well together, the packer is put to the top ends of all tool strings, a ground hydraulic control cabinet is pressed, the liquid in a pressure release channel pushes a piston to move upwards, a setting shear pin is cut when a certain pressure is reached, a compression rubber sleeve is continuously moved upwards to complete the setting of all hydraulic control packers, and stratified water injection is realized, at the moment, when a well needs to be back-washed, a ground hydraulic control pipeline is decompressed, because the rubber sleeve of the hydraulic control packer is not completely released, water is injected from an oil sleeve ring in a hollow way and throttled at the uppermost packer, turbulence is finally formed, when a certain pressure is reached, the plunger is pushed, a small spring is compressed to drive the sliding sleeve to move downwards, when a through hole in the plunger is coincided with a decompression outlet, the liquid in the decompression channel flows to a stratum from the decompressed position until the internal pressure and the oil sleeve pressure reach a balanced state, whether observation backwash pressure reduces this moment, whether preliminary judgement liquid control packer deblocking is thorough, if not reach ideal effect, can be through injecting into high temperature trigger liquid in the pit shaft such as potassium chloride, when the downhole temperature reaches 120 ℃, the inside polymer class memory material of quick deblocking liquid control packer begins the material and forms the thixotropy, resumes its memory shape that begins, and memory material axial tension in the annular space promptly, radial contraction steadily promotes the piston to move down by this kind of shape change, helping hand packer packing element deblocking. The transition temperature of the polymer memory material is preferably controlled to be about 120 ℃, the downhole temperature of the offshore oilfield is basically between 60 ℃ and 100 ℃, the boosting and deblocking mode does not need too high transition temperature, the reliability of the sealing material can be ensured, meanwhile, the memory material is used as a boosting and deblocking mechanism, extra hydraulic control setting force cannot be increased, the polymer memory material can be timely transformed when the temperature in the well is abnormally changed, and the hydraulic control system cannot be timely suppressed to cause packer failure.
According to the embodiment shown in fig. 6, as another embodiment of the invention, the polymer memory material is replaced by a rigid spring, the packer and a common liquid packer are put into the well together, the packer is put to the top end of all tool strings, the ground hydraulic control cabinet is pressed, the liquid in the hydraulic channel pushes the piston to move upwards, when a certain pressure is reached, the setting shear pin is cut off, the piston is continuously moved upwards to compress the rubber sleeve to complete the setting of all hydraulic control packers, and the separate-layer water injection is realized, at the moment, when the well needs to be washed back, the ground hydraulic control pipeline is decompressed, the piston is pushed to move downwards under the action of the rigid spring, at the moment, the oil sleeve annulus is injected with water to observe the outlet condition of the oil pipe, if the outlet condition is smaller or not out, the rubber sleeve of the hydraulic control packer is not completely deblocked, the injection pressure of the oil sleeve annulus is continuously increased, the injected water throttles at the uppermost packer, and finally forms turbulence, when certain pressure is reached, the plunger is pushed to compress the small spring to drive the sliding sleeve to move downwards, and when the pressure relief through hole in the plunger is coincided with the pressure relief outlet, liquid in the pressure relief channel flows to the stratum from the pressure relief through hole until the internal pressure and the pressure of the oil sleeve reach a balanced state.
In the description of the present invention, it is to be understood that the positional indications or positional relationships are based on those shown in the drawings and are for the purpose of facilitating the description of the present invention, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A quick-release hydraulic control packer comprises a central tube, a setting mechanism and a pressure release mechanism, wherein the setting mechanism and the pressure release mechanism are sleeved on the central tube; the pressure relief mechanism comprises an upper connector, a plunger, a sliding sleeve and a small spring, the lower end of the lower connector is in a thread-buckle type connection with a central pipe, the lower connector is respectively provided with a hydraulic channel and a pressure relief channel which are in eccentric axial directions, the bottom of the hydraulic channel is communicated with the bottom of the pressure relief channel, the bottom of the hydraulic channel is also communicated with an annular space formed between the connecting sleeve and the central pipe, the plunger and the sliding sleeve are both arranged in the pressure relief channel in a sliding and sealing manner, the lower end of the sliding sleeve is connected with the small spring, the plunger is arranged above the sliding sleeve, the upper port of the pressure relief channel is a pressure relief channel interface, the inner wall of the pressure relief channel interface is provided with a jackscrew which is used for connecting a pressure relief pipeline, the upper port of the hydraulic channel is a hydraulic control pipeline interface, the hydraulic control pipeline interface is connected with the hydraulic pipeline, the lower connector is provided with a pressure relief outlet which is radially communicated with the pressure relief channel, the sliding sleeve is used for plugging and releasing the pressure relief outlet, the sliding sleeve is provided with a pressure relief through hole, the lower end of the pressure relief through hole is communicated with the pressure relief channel, and the upper end of the pressure relief through hole is radially turned to be communicated to the outside of the sliding sleeve.
2. The quick-release hydraulic-controlled packer according to claim 1, wherein the release assisting mechanism is a polymer memory material release assisting sleeve or a rigid spring.
3. The quick-release hydraulic-control packer as claimed in claim 2, wherein the setting mechanism comprises a piston, a rubber cylinder and an adjusting ring, the piston is slidably sleeved on the outer wall of the central pipe, the rubber cylinder is sleeved on the outer wall of the piston, the adjusting ring is connected to the upper end of the rubber cylinder, the upper end of the adjusting ring is in threaded connection with the connecting sleeve, the lower end of the rubber cylinder abuts against a reducing step formed on the outer wall of the piston, and the upper end of the piston extends into an annulus formed between the connecting sleeve and the central pipe.
4. The quick-release hydraulic-controlled packer and the construction method thereof according to claim 3, wherein the rubber cylinders comprise two or more rubber cylinders, and a spacer ring is arranged between every two rubber cylinders; the lower end of the central pipe is connected with a lower joint, the lower joint is provided with a lower joint axial pressure transmission channel which is eccentrically and axially communicated, and the upper end of the lower joint axial pressure transmission channel is communicated to the lower end surface of the piston; the piston lower extreme stretches into the lower clutch inner wall, the piston still fixes on the lower clutch through sitting to seal the shear pin, set up polytetrafluoroethylene packing ring and sealed O circle between piston outer wall and the lower clutch inner wall.
5. The quick-release hydraulic-controlled packer is characterized in that a coupling is connected to the upper end of the upper joint.
6. The construction method of claim 4, wherein the liquid in the hydraulic channel pushes the piston to move upward to cut the setting shear pin, and then moves upward to compress the rubber cylinder to complete setting of all hydraulic packers, thereby realizing separate layer water injection, at this time, when a reverse well is needed, the ground hydraulic pipeline is decompressed, because the rubber cylinder of the hydraulic packer is not completely deblocked, water is injected from the empty oil sleeve ring to throttle at the uppermost packer, finally a turbulent flow is formed to push the plunger, compress the small spring to drive the sliding sleeve to move downward, when the decompression through hole inside the plunger is superposed with the decompression outlet, the liquid in the decompression channel flows to the stratum from this position until the internal pressure and the oil sleeve pressure reach a balanced state, at this time, whether the reverse washing pressure is reduced or not is observed, whether the hydraulic packer is completely deblocked is preliminarily judged, if the ideal effect is not reached, the high-temperature underground trigger liquid of potassium chloride can be injected into the well shaft, when the downhole temperature reaches 120 ℃, the polymer memory material starting material in the hydraulic control packer is quickly unsealed to form thixotropy, and the starting memory shape is recovered, namely the memory material is axially stretched and radially contracted in the annular space, the piston is stably pushed to move downwards by the shape change, and the power-assisted packer rubber barrel is unsealed.
7. The construction method of claim 4, wherein the liquid in the hydraulic channel pushes the piston to move upward, the setting shear pin is cut off, the setting sleeve is continuously moved upward to compress the rubber barrel against the elasticity of the rigid spring, the setting of all the hydraulic control packers is completed, separate-zone water injection is realized, when a reverse well is needed, the ground hydraulic control pipeline is decompressed, the piston is pushed to move downward under the action of the rigid spring, the oil sleeve annulus water injection observes the outlet condition of the oil pipe, if the outlet condition is smaller or not, the rubber barrel of the hydraulic control packer is not completely deblocked, the injection pressure of the oil sleeve annulus is continuously increased, the injected water is throttled at the uppermost packer, turbulence is finally formed, the plunger is pushed, the small spring is compressed to drive the sliding sleeve to move downward, when the decompression through hole inside the plunger coincides with the decompression outlet, the liquid in the channel flows to the stratum from the position to be decompressed, until the internal pressure and the oil jacket pressure reach an equilibrium state.
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| CN111706313B (en) * | 2020-07-01 | 2021-01-15 | 西南石油大学 | Pressure relief protector for deep water oil gas test retention valve |
| CN112664157A (en) * | 2020-12-30 | 2021-04-16 | 核工业北京地质研究院 | Pressure regulation and control device and method for packer |
| CN116556878B (en) * | 2023-05-24 | 2023-12-26 | 东营市福利德石油科技开发有限责任公司 | Packer capable of being set and unset repeatedly |
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