CN217001774U - Thermal recovery packer - Google Patents

Abstract

The utility model belongs to the technical field of plugging in a well, and particularly relates to a thermal recovery packer. The thermal recovery packer comprises an upper joint, a central pipe, a lower joint and an outer pipe, wherein the lower joint and the central pipe form an annular piston cavity, an annular piston is arranged in the annular piston cavity in a sliding and sealing mode along the vertical direction, a communication hole which is communicated with the annular piston cavity and is positioned below the annular piston is formed in the pipe wall of the central pipe, a rubber cylinder is sleeved outside the annular piston, and a conical supporting section of the annular piston can be inserted into the rubber cylinder and enables the rubber cylinder to be radially expanded and sealed; the inner wall of the annular piston is provided with a lock catch, the outer wall of the central tube is correspondingly provided with a lock ring seat, the lock ring seat is provided with an unsealing ring through a second pin, the lock ring seat is provided with a downward annular step, the annular step and the unsealing ring are vertically spaced to form an annular groove, an opening lock ring is sleeved in the annular groove, and the second pin can be cut off to enable the packing element to be unsealed in the packing element when the upper joint is lifted.

Description

Thermal recovery packer

Technical Field

The utility model belongs to the technical field of in-well plugging, and particularly relates to a thermal recovery packer with a rubber sleeve easy to expand and plug.

Background

The thermal recovery packer is a common and key downhole tool in heavy oil recovery, is used for plugging a steam injection well, injecting steam in layers and the like, needs to bear high temperature and high pressure, and has higher performance requirement. The existing common Y241 packer adopts a hydraulic setting and lifting deblocking mode, when in setting, a rubber cylinder is extruded by external force along the axial direction, and the rubber cylinder expands outwards in the radial direction in the axial extrusion process so as to achieve the purpose of blocking the annular space of an oil sleeve.

Wherein, the chinese utility model patent that the publication number is CN215907813U is exactly the mode that adopts the axial extrusion packing element so that the packing element radially expands outward, specifically, this patent discloses a packer that sealing performance is good, including the top connection, top connection lower part threaded connection has the center tube, the cylinder liner be located the outside of center tube and with the mutual interval between the center tube, sliding seal is equipped with the propulsion cover in the interval, the lower extreme threaded connection of center tube has the lower clutch, the position sleeve is installed through the shear pin to the lower clutch outside, the cylinder liner, be equipped with the packing element between the position sleeve, the packing element both ends vulcanize fixed packing element seat and cylinder liner, the position sleeve joins in each other. The upper joint is provided with a liquid inlet hole communicated with the internal channel of the central pipe, a one-way valve is arranged in the liquid inlet hole, and the top surface of the cylinder sleeve is communicated with the one-way valve. When the hydraulic cylinder is used, pressure liquid enters the top of the cylinder sleeve through the liquid inlet hole and the one-way valve, the pressure liquid pushes the cylinder sleeve downwards, the cylinder sleeve moving downwards is matched with the positioning sleeve to extrude the rubber cylinder along the axial direction, and the rubber cylinder is forced to expand radially and expand to be set. Under the action of the one-way valve, the rubber cylinder does not retract any more and is kept in an expansion setting state; when the rubber sleeve is unsealed, the pipe column is rotated, the shear pin is cut off, the positioning sleeve moves downwards relative to the lower joint under the action of the resilience force of the rubber sleeve, and the unsealing is completed.

In the prior art, no matter a Y241 packer or other types of packers, a mode of expanding and setting by radially outwards expanding an axial extrusion rubber cylinder is mostly adopted, but the axial setting force required by the expansion setting mode is large, and setting is not easy to perform; and the rubber sleeve is axially extruded and expanded under the action of setting force, and the rubber sleeve and the well wall can rub in the process, so that the surface of the rubber sleeve is easily abraded, the packer is not tight in sealing, and the plugging success rate is low.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a thermal recovery packer to solve the technical problems that in the prior art, radial outward expansion setting is realized by axially extruding a rubber sleeve, so that the required setting force is large, and the plugging success rate is low.

In order to realize the purpose, the technical scheme of the thermal recovery packer provided by the utility model is as follows: a thermal recovery packer comprises an upper joint, a central pipe and a lower joint, wherein the central pipe and the lower joint are sequentially connected to the upper joint, the upper joint is also connected with an outer pipe, the central pipe and the outer pipe are arranged at intervals from inside to outside, the lower joint comprises a small hole section which is positioned below and connected with the central pipe, and a large hole section which is positioned above, the large hole section of the lower joint and the central pipe form an annular piston cavity with an opening at the top and a closed bottom, an annular piston is assembled in the annular piston cavity in a sliding and sealing mode along the up-down direction, the upper end of the annular piston extends into the outer pipe and is connected with the outer pipe through a first pin, a communication hole which is communicated with the annular piston cavity and is positioned below the annular piston is arranged on the pipe wall of the central pipe, the communication hole is used for injecting liquid into the annular piston cavity to upwards push the annular piston, and when the designed jacking force reaches the designed value, the first pin is cut off and the annular piston upwards; a rubber cylinder is sleeved outside the annular piston above the lower joint, the upper end of the rubber cylinder is fixedly connected with or in top-pressing fit with the bottom of the outer pipe, the annular piston is provided with a conical supporting section for supporting the bottom of the rubber cylinder, the outer diameter of the conical supporting section is gradually increased from top to bottom, and when the annular piston is pushed upwards, the conical supporting section is inserted into the rubber cylinder and enables the rubber cylinder to radially expand outwards for setting so as to seal the oil sleeve annulus;

the annular piston comprises a small hole section and a large hole section, the small hole section is located at the bottom and matched with the central pipe in a sliding sealing mode, the large hole section of the annular piston is larger than the outer diameter of the central pipe, a lock catch is arranged on the inner wall of the large hole section of the annular piston, a lock ring seat is correspondingly arranged on the outer wall of the central pipe, an unsealing ring is installed on the lock ring seat through a second pin, the lock ring seat is provided with a downward annular step, the annular step and the unsealing ring are vertically spaced to form an annular groove, an opening lock ring is sleeved in the annular groove, a lock tooth is arranged on the opening lock ring, the lock catch passes over the lock tooth when the annular piston moves upwards and is locked in a one-way mode by the lock tooth to prevent the downward movement relative to the opening lock ring, and when the upper connector is lifted, the second pin can be cut off to enable the unsealing ring and the opening lock ring to move downwards along with the annular piston to enable the rubber cylinder to be unsealed and unsealed.

Has the advantages that: in the utility model, the conical section of the annular piston can be inserted into the rubber cylinder when moving upwards so as to expand the rubber cylinder radially outwards, thus realizing setting, and compared with the mode of forcing the rubber cylinder radially outwards to expand through axial extrusion in the prior art, the required setting force is smaller; in the setting process, the rubber cylinder only expands radially outwards, and does not rub against the well wall, so that abrasion is avoided, and the technical problems of large setting force and easy abrasion in the setting mode in the prior art are solved. The utility model prevents the rubber sleeve from returning after being set through the lock catch and the opening lock ring, realizes deblocking through the second pin, and ensures that the thermal production packer cannot be set in advance due to overlarge liquid pressure in the well after being put into the well along with the pipe column through the first pin.

Further, at least one of the bottom surface of the split locking ring and the top surface of the unsealing ring is an inclined surface, and the inclined surface extends obliquely from top to bottom and radially outward. After the cooperation of opening catch and hasp, the annular piston at hasp place receives decurrent effort under dead weight and packing element retraction effect, and the hasp can support on the deblocking ring, sets up behind the inclined plane, and the effort that annular piston received is big more, and the outer expanding size of opening catch is big more, and the lock tooth on the opening catch is more reliable with the hasp complex, avoids annular piston deblocking down.

Furthermore, the thermal recovery packer comprises an upper shoulder protector and a lower shoulder protector which are sleeved outside the annular piston, and the upper shoulder protector and the lower shoulder protector are respectively arranged on the upper side and the lower side of the rubber cylinder; the upper shoulder protector and the lower shoulder protector are both graphite steel wire protective nets, the upper shoulder protector is used for being radially expanded outwards by being pressed by the rubber cylinder and the outer pipe when the rubber cylinder is in a setting state, an outer pressure ring is fixedly arranged outside the annular piston, the outer pressure ring is used for moving upwards along with the annular piston and pressing the lower shoulder protector when the rubber cylinder is in a setting state, and the lower shoulder protector is pressed by the rubber cylinder and the outer pressure ring and is radially expanded outwards when the rubber cylinder is in a setting state. The upper shoulder protector and the lower shoulder protector are both graphite steel wire protecting nets, radial outward expansion is easy to occur after the upper shoulder protector and the lower shoulder protector are applied with axial force, and the upper end and the lower end of the rubber sleeve can be blocked and positioned after the rubber sleeve is sealed, so that the rubber sleeve is prevented from being softened during high-temperature steam injection and then losing from an interval between a thermal recovery packer and a well wall.

Further, the thermal recovery packer further comprises a rubber sleeve retaining ring positioned below the lower shoulder protector, and the outer pressure ring pushes the lower shoulder protector by pushing the rubber sleeve retaining ring. After the rubber cylinder retaining ring is arranged, the outer pressure ring can not be in direct contact with the lower shoulder protector, and the lower shoulder protector is protected.

Further, an upward outer annular step is arranged on the periphery of the annular piston, an outer sealing gasket is supported and placed on the outer annular step, and the outer annular ring is assembled on the annular piston in a threaded mode and presses the outer sealing gasket downwards to the outer annular step. Through the cooperation of outer annular step, outer pressure ring and outer sealing gasket, realized the sealed between annular piston and the lower clutch inner wall, outer pressure ring had both played the effect that pushes away shoulder pad down in addition, played the effect that compresses tightly outer sealing gasket again, and the function is more concentrated, and required spare part is less.

Furthermore, interior week of annular piston is equipped with interior annular step down, the interior internal screw thread of annular piston is equipped with the internal compression ring, is equipped with the inner packing pad between internal compression ring and the interior annular step, and the internal compression ring is used for compressing tightly the inner packing pad on the interior annular step. The sealing performance between the annular piston and the central pipe is ensured by arranging the inner annular step, the inner pressure ring and the inner sealing gasket.

Further, the outer sealing gasket and the inner sealing gasket respectively comprise at least two graphite rings which are stacked together. The graphite ring has the characteristic of high temperature and high pressure resistance, and is suitable for the use working condition of high-temperature steam injection thermal recovery.

Furthermore, the outer pipe is provided with a through flow hole which is communicated with the upper end face of the annular piston through an annular space between the outer pipe and the central pipe. When the well is lowered, liquid in the well can enter the annular piston cavity through the communicating hole to upwards push the annular piston, and can enter the top of the annular piston through the through hole to downwards push the annular piston, so that the annular piston is prevented from shearing the first pin due to being pushed, and the advance setting is avoided.

Furthermore, the first pin and the second pin are uniformly distributed with at least two pins along the circumferential direction. The first pin and the second pin are uniformly distributed along the circumferential direction, so that the stress balance in all directions can be ensured.

Further, at least two of the communication holes are arranged in the circumferential direction. Set up two at least intercommunicating pores, when beating hydraulic pressure setting, can increase the jacking force to annular piston, improve and set and seal efficiency.

Drawings

FIG. 1 is a schematic structural view of a thermal packer provided by the present invention;

FIG. 2 is an enlarged view of FIG. 1 at A;

FIG. 3 is an enlarged view at B of FIG. 1;

description of reference numerals:

1. an upper joint; 2. an outer tube; 3. a through-flow aperture; 4. a central tube; 5. a lock ring seat; 6. a first pin; 7. an open lock ring; 8. an upper shoulder protector; 9. a second pin; 10. unsealing the ring; 11. a rubber cylinder; 12. locking; 13. a lower shoulder protector; 14. a rubber cylinder retaining ring; 15. an annular piston; 16. a first seal ring; 17. an outer pressure ring; 18. an outer seal gasket; 19. an inner seal; 20. an inner compression ring; 21. a second seal ring; 22. an annular piston chamber; 23. a lower joint; 24. a communicating hole; 25. a first annular space; 26. a second annular space; 27. a bevel.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the utility model, are intended for purposes of illustration only and are not intended to limit the scope of the utility model. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, which may be present, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, elements recited by the phrases "comprising an … …," or the like, do not exclude the presence of such elements, processes, or methods.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" when they are used are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art from specific situations.

In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the term "provided" may be used in a broad sense, for example, the object provided may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be detachable or non-detachable. The specific meanings of the above-mentioned terms in the present invention can be understood by those skilled in the art through specific situations.

The present invention will be described in further detail with reference to examples.

The specific embodiment of the thermal recovery packer provided by the utility model comprises the following steps:

as shown in figures 1 to 3, the thermal recovery packer is applied to the working condition of layered steam injection thermal recovery and comprises an upper joint 1, wherein inner buckles are arranged on the upper end and the lower end of the upper joint 1, outer buckles are arranged on the outer side of the upper joint, the inner buckles on the upper end of the upper joint 1 are used for being connected with an oil pipe, a central pipe 4 is arranged in the inner buckles on the lower end of the upper joint 1, the central pipe 4 extends downwards, and an outer pipe 2 is arranged on the outer buckles of the upper joint 1. The outer pipe 2 comprises an upper small hole section and a lower large hole section, the upper small hole section of the outer pipe 2 is in threaded fit with the upper joint 1, and the inner diameter of the lower large hole section is larger than the outer diameters of the central pipe 4 and the upper joint 1, so that a second annular space 26 with a closed top and an open bottom is formed. The upper part and the lower part of the outer pipe 2 are respectively and uniformly provided with four through holes along the circumference, the four through holes at the upper part are through holes 3, and liquid enters the second annular space 26 through the through holes 3; the four lower through holes are used for the first pin 6 to penetrate.

The lower extreme of center tube 4 is connected with lower clutch 23, and lower clutch 23 includes the macropore section of top and the aperture section of below, and center tube 4 is in the same place with the aperture section screw assembly of lower clutch 23, forms open, the closed annular piston chamber in bottom 22 in top between the macropore section of lower clutch 23 and the center tube 4, and four intercommunicating pores 24 of circumference equipartition are seted up to the lower part of center tube 4, and annular piston chamber 22 is connected to intercommunicating pore 24 and the inner chamber of center tube 4. As shown in fig. 1, the outer tube 2 and the lower joint 23 are not in contact with each other.

An annular piston 15 is slidably and sealingly mounted in the annular piston chamber 22, the annular piston 15 extending into the outer tube 2 at its top and above the communication hole 24 at its bottom. Two ring grooves are formed in the inner circumferential surface and the outer circumferential surface of the annular piston 15, a first sealing ring 16 is mounted in the ring groove of the inner circumferential surface, a second sealing ring 21 is mounted in the ring groove of the outer circumferential surface, the first sealing ring 16 seals a gap between the annular piston 15 and the central pipe 4, and the second sealing ring 21 seals a gap between the annular piston 15 and the lower joint 23. The first seal ring 16 is positioned above the second seal ring 21, and the first seal ring 16 and the second seal ring 21 are made of high-temperature-resistant fluororubber materials.

Offered outer annular step up in the outer peripheral face of annular piston 15, outer annular step is gone up and is supported outer gasket 18, outer gasket 18 adopts the high temperature and pressure resistant graphite ring, the stack of direction from top to bottom is followed to a plurality of graphite rings, it has outer seal ring 17 to go back the screw thread assembly on annular piston 15's outer peripheral face, outer seal ring 17 compresses tightly outer gasket 18 on outer annular step, play the sealed effect between annular piston 15 and the lower clutch 23. Similarly, the inner circumferential surface of the annular piston 15 is provided with a downward inner annular step, the inner circumferential surface is further provided with an inner pressing ring 20 in a threaded manner, an inner sealing gasket 19 is compressed between the inner pressing ring 20 and the inner annular step, the inner sealing gasket 19 also adopts a plurality of high-temperature and high-pressure resistant graphite rings, and the inner sealing gasket 19 plays a role in sealing between the annular piston 15 and the central tube 4.

As shown in figure 1, an upper shoulder protector 8, a rubber cylinder 11, a lower shoulder protector 13 and a rubber cylinder retaining ring 14 are sleeved outside the annular piston 15 from top to bottom in sequence, and all the parts are not connected. The rubber sleeve 11 is made of high-temperature and high-pressure resistant modified polytetrafluoroethylene rubber sleeves, the upper shoulder protector 8 and the lower shoulder protector 13 are made of graphite steel wire protective nets, the elastic deformation is large, and the rubber sleeve 11 can be prevented from being deformed and losing due to the fact that the rubber sleeve is deformed and cannot be reliably stopped when steam is injected at high temperature after elastic deformation.

The outer diameter of the annular piston 15 is small at the top and big at the bottom, the intersecting position is provided with a conical section with the outer diameter gradually increasing from top to bottom, the shape of the inner side of the bottom of the rubber cylinder 11 is consistent with that of the conical section of the annular piston 15, and the rubber cylinder is supported on the conical section of the annular piston 15. The conical section can generate radial force when the annular piston 15 moves upwards, and drives the rubber barrel 11 to expand and deform radially, so that the oil sleeve annulus is sealed. In order to keep the rubber sleeve 11 after expansion deformation in an expansion deformation state, as shown in fig. 1 and fig. 2, the inner diameter of the annular piston 15 is designed to be a structure with a large upper part and a small lower part, a first annular space 25 is formed between the large hole section with the larger upper part and the central tube 4, the small hole section with the smaller lower part is in sliding sealing fit with the central tube 4, a lock catch 12 is arranged on the inner circumferential surface of the large hole section in the annular piston 15, the lock catch 12 extends for a certain length along the up-down direction, the external thread of the central tube 4 is provided with a lock ring seat 5, the lock ring seat 5 is a structure with a big upper part and a small lower part of the outer diameter, and form annular step down, the path section of lock ring seat 5 is seted up flutedly, and the bottom cover of lock ring seat 5 has deblocking ring 10, and deblocking ring 10 has 8 screw holes along the circumference equipartition, and the screw hole is with the recess one-to-one on the lock ring seat 5 to install deblocking ring 10 on lock ring seat 5 through second pin 9. The cover has opening lock ring 7 in the annular groove between the major diameter section of deblocking ring 10 and lock ring seat 5, opening lock ring 7 is retrained in the annular groove, opening lock ring 7 is one side open-ended lock ring, it has elastic shrinkage, the ability of expansion, it has the locking tooth to open on opening lock ring 7's periphery, the locking tooth tilt up arranges, locking tooth and hasp 12 are the relation of one-way locking, hasp 12 can for locking tooth rebound, cross behind the locking tooth, the locking tooth carries out the locking to hasp 12, prevent that the annular piston 15 at hasp 12 place from going down.

As shown in fig. 2, the bottom of the split locking ring 7 and the bottom of the unsealing ring 10 are both provided with an inclined surface 27, the inclined surfaces 27 extend obliquely from inside to outside and outward in the radial direction, and the inclined surfaces 27 are provided on the split locking ring 7 and the unsealing ring 10, so that after the split locking ring 7 is locked with the lock 12, the split locking ring 7 can be kept in an expanded state by the self weight of the annular piston 15 where the lock 12 is located after the split locking ring 7 is pulled down, and the locking teeth of the split locking ring 7 and the lock 12 can be always kept locked.

As shown in fig. 1, the upper end of the annular piston 15 extends into the outer tube 2, four uniformly distributed threaded holes are formed in the upper end of the annular piston 15, and the first pin 6 penetrates through the through hole in the bottom of the outer tube 2 and then is matched with the threaded holes to fix the annular piston 15 on the outer tube 2.

After the components are assembled, the upper shoulder pad 8 is pressed against the bottom of the outer tube 2.

The using process of the utility model is as follows: the thermal recovery packer is lowered into the underground designed depth along with a pipe column, the thermal recovery packer is thrown and pressed through an oil pipe, hydraulic pressure enters an annular piston cavity 22 through four communicating holes 24 in the lower portion of a central pipe 4 to generate upward thrust, when certain pressure is reached, a first pin 6 is sheared off to push an annular piston 15 upwards, and a first sealing ring 16, an outer pressure ring 17, an outer sealing gasket 18, an inner sealing gasket 19, an inner pressure ring 20 and a second sealing ring 21 move upwards along with the annular piston 15 simultaneously. Under the action of thrust, the conical section of the annular piston 15 generates radial force to radially expand and deform the rubber barrel 11, and meanwhile, the locking pressure on the opening locking ring 7 is locked with the lock catch 12 of the annular piston 15, so that the annular piston 15 is fixed, and the setting of the packer is finished. When the packer finishes setting, the outer pressure ring 17 pushes the rubber sleeve retaining ring 14 and the lower shoulder protector 13 and pushes the rubber sleeve 11, the upper shoulder protector 8 and the lower shoulder protector 13 both elastically deform and expand outwards, the upper end and the lower end of the rubber sleeve 11 are blocked, and the rubber sleeve 11 is prevented from losing.

When the pipe column is unpacked, the pipe column is lifted, the lifting force is transmitted to the central pipe 4 through the upper joint 1, then transmitted to the lock ring seat 5 through the central pipe 4, and transmitted to the second pin 9 through the lock ring seat 5, and at the moment, the rubber cylinder 11 and the part connected with the rubber cylinder 11 cannot move because the rubber cylinder 11 is tightly tensioned in the sleeve. When the lifting force of the pipe column is greater than the shearing force of the second pin 9, the second pin 9 is sheared off, the opening lock ring 7 is not restrained by the lock ring seat 5 at the moment, the annular piston 15, the opening lock ring 7 and the lock ring seat 5 all move downwards under the action of the elastic restoring force of the rubber barrel 11, the rubber barrel 11 is separated from the casing, and the unsealing process is completed.

Wherein the first pin 6 plays a role in preventing the annular piston 15 from moving upwards under the action of downhole liquid to cause the packer to be set in advance during the downhole process; furthermore, by opening the flow hole 3 in the outer tube 2, the liquid can be led to the upper end of the annular piston 15, and a certain downward force can be applied to the annular piston 15 in balance with the upward force applied to the annular piston 15 by the liquid.

It should be noted that the thermal packer of the present invention does not have an anchoring structure such as slips, and the anchoring structure needs to be connected when in use, and the anchoring structure also adopts a lifting-up unlocking mode.

In this embodiment, 4 communication holes 24 are uniformly distributed in the circumferential direction. In other embodiments, the number of the communication holes 24 may be increased or decreased according to the required flow rate, or may be one, and the arrangement of the communication holes 24 is not limited to the uniform distribution.

In this embodiment, the first pins 6 have 4 circumferentially and uniformly distributed, and the second pins 9 have 8 circumferentially and uniformly distributed. In other embodiments, the number and arrangement of the first pins 6 and the second pins 9 are changed according to actual situations.

In this embodiment, the outer tube 2 is provided with a through-flow hole 3. In other embodiments, no through-flow holes are provided in the outer tube, and to prevent premature setting, the diameter of the first pin can be increased to increase the force required to shear.

In this embodiment, the outer gasket 18 and the inner gasket 19 each comprise at least two graphite rings stacked together. In other embodiments, the outer gasket 18 and the inner gasket 19 may be ordinary rubber gaskets.

In this embodiment, the annular piston 15 is sealed at its inner periphery to the central tube 4 by the inner compression ring 20, the inner gasket 19 and the first sealing ring 16, and at its outer periphery to the lower joint 23 by the outer compression ring 17, the outer gasket 18 and the second sealing ring 21. In other embodiments, only the first seal ring 16 and the second seal ring 21 remain. At this time, the outer ring 17 only acts to push the lower shoulder pad 13.

In this embodiment, a rubber tube retaining ring 14 is arranged below the lower shoulder protector 13. In other embodiments, the rubber cylinder baffle ring 14 is eliminated, and the lower shoulder protector 13 is directly pushed by the outer pressure ring 17.

In this embodiment, the rubber tube 11 is protected by providing the upper shoulder pad 8 and the lower shoulder pad 13. In other embodiments, the upper shoulder pad 8 and the lower shoulder pad 13 are eliminated for the convenience of setting.

In this embodiment, the upper end of the rubber sleeve 11 and the outer tube 2 are only in a press fit relationship without a fixed connection relationship. In other embodiments, the rubber tube 11 is fixedly connected to the outer tube 2, and of course, if the upper shoulder pad 8 is provided, the rubber tube 11, the upper shoulder pad 8 and the outer tube 2 may be fixed together.

In this embodiment, the bottom surface of the split locking ring 7 and the top surface of the unsealing ring 10 are both inclined surfaces. In other embodiments, only one of the two is a bevel; in other embodiments, both of them are not inclined, i.e. the bottom surface of the split lock ring 7 and the top surface of the unsealing ring 10 are both flat surfaces, and the unsealing ring 10 supports the split lock ring 7 through the flat surfaces.

Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and not intended to limit the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments without inventive effort, or some technical features of the present invention may be substituted with equivalents. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a thermal recovery packer, includes top connection (1) and connects gradually center tube (4), lower clutch (23) on top connection (1), its characterized in that: the upper joint (1) is further connected with an outer pipe (2), the central pipe (4) and the outer pipe (2) are arranged at intervals from inside to outside, the lower joint (23) comprises a small hole section which is located below and connected with the central pipe (4), and a large hole section which is located above, the large hole section of the lower joint (23) and the central pipe (4) form an annular piston cavity (22) with an open top and a closed bottom, an annular piston (15) is assembled in the annular piston cavity (22) in a sliding and sealing mode along the up-down direction, the upper end of the annular piston (15) extends into the outer pipe (2) and is connected with the outer pipe (2) through a first pin (6), a communication hole (24) which is communicated with the annular piston cavity (22) and located below the annular piston (15) is formed in the pipe wall of the central pipe (4), the communication hole (24) is used for injecting liquid into the annular piston cavity (22) to push the annular piston (15) upwards, when the jacking force reaches a designed value, the first pin (6) is sheared off and the annular piston (15) is pushed upwards; a rubber cylinder (11) is sleeved outside the annular piston (15) above the lower joint (23), the upper end of the rubber cylinder (11) is fixedly connected with or in top-pressure fit with the bottom of the outer pipe (2), the annular piston (15) is provided with a conical supporting section for supporting the bottom of the rubber cylinder (11), the outer diameter of the conical supporting section is gradually increased from top to bottom, and when the annular piston (15) is pushed upwards, the conical supporting section is inserted into the rubber cylinder (11) and enables the rubber cylinder (11) to radially expand and seat so as to seal the oil jacket annular space;

the annular piston (15) comprises a small hole section and a large hole section, the small hole section is located at the bottom and matched with the central pipe (4) in a sliding sealing mode, the large hole section is located at the top, the inner diameter of the large hole section of the annular piston (15) is larger than the outer diameter of the central pipe (4), a lock catch (12) is arranged on the inner wall of the large hole section of the annular piston (15), a lock ring seat (5) is correspondingly arranged on the outer wall of the central pipe (4), an unsealing ring (10) is installed on the lock ring seat (5) through a second pin (9), the lock ring seat (5) is provided with a downward annular step, the annular step and the unsealing ring (10) are vertically spaced to form an annular groove, an opening lock ring (7) is sleeved in the annular groove, locking teeth are arranged on the opening lock ring (7), the lock catch (12) crosses the locking teeth when the annular piston (15) moves upwards and is unidirectionally locked by the locking teeth to prevent downward movement relative to the opening lock ring (7), and the second pin (9) can be sheared when the upper connector (1) is lifted so that the unsealing ring (10) can be installed, The opening locking ring (7) moves downwards along with the annular piston (15) to enable the rubber cylinder (11) to be contracted and unsealed.

2. The thermal packer of claim 1, wherein: at least one of the bottom surface of the opening locking ring (7) and the top surface of the unsealing ring (10) is an inclined surface (27), and the inclined surface (27) extends obliquely from top to bottom and radially outwards.

3. The thermal packer of claim 1 or 2, wherein: the thermal production packer comprises an upper shoulder protector (8) and a lower shoulder protector (13) which are sleeved outside an annular piston (15), wherein the upper shoulder protector (8) and the lower shoulder protector (13) are respectively arranged on the upper side and the lower side of a rubber cylinder (11); the upper shoulder protector (8) and the lower shoulder protector (13) are both graphite steel wire protective nets, the upper shoulder protector (8) is used for being pressed by the rubber cylinder (11) and the outer pipe (2) to expand radially outwards when the rubber cylinder (11) is in a setting state, an outer pressure ring (17) is fixedly arranged outside the annular piston (15), the outer pressure ring (17) is used for moving upwards along with the annular piston (15) and pressing the lower shoulder protector (13) when the rubber cylinder (11) is in a setting state, and the lower shoulder protector (13) is pressed by the rubber cylinder (11) and the outer pressure ring (17) to expand radially outwards when the rubber cylinder (11) is in a setting state.

4. The thermal packer of claim 3, wherein: the thermal production packer further comprises a rubber sleeve baffle ring (14) positioned below the lower shoulder protector (13), and the outer pressure ring (17) pushes the lower shoulder protector (13) through pushing the rubber sleeve baffle ring (14).

5. The thermal packer of claim 3, wherein: the periphery of the annular piston (15) is provided with an upward outer annular step, an outer sealing gasket (18) is supported and placed on the outer annular step, and the outer sealing gasket (18) is assembled on the annular piston (15) through threads of the outer annular ring (17) and is pressed downwards to the outer annular step.

6. The thermal packer of claim 5, wherein: interior week of annular piston (15) is equipped with interior annular step down, the interior internal screw thread of annular piston (15) is equipped with internal compression ring (20), is equipped with between internal compression ring (20) and the interior annular step interior sealed pad (19), and internal compression ring (20) are used for compressing tightly interior sealed pad (19) on the interior annular step.

7. The thermal packer of claim 6, wherein: the outer sealing gasket (18) and the inner sealing gasket (19) respectively comprise at least two graphite rings which are stacked together.

8. The thermal packer of claim 1 or 2, wherein: be equipped with through-flow hole (3) on outer tube (2), through-flow hole (3) communicate with the up end of annular piston (15) through the annular space between outer tube (2) and center tube (4).

9. The thermal packer of claim 1 or 2, wherein: the first pin (6) and the second pin (9) are uniformly distributed with at least two pins along the circumferential direction.

10. The thermal packer of claim 1 or 2, wherein: at least two communication holes (24) are arranged in the circumferential direction.

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