CN219299278U

CN219299278U - Thermal recovery packer

Info

Publication number: CN219299278U
Application number: CN202223545623.6U
Authority: CN
Inventors: 蔡万伟; 董海涛; 王超; 鲁艮
Original assignee: Petrostar Oil Technology Co ltd
Current assignee: Petrostar Oil Technology Co ltd
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-07-04
Anticipated expiration: 2032-12-29

Abstract

The utility model provides a thermal recovery packer, which comprises: a light pipe; the main body cylinder is sleeved outside the light pipe and is arranged close to the upper end of the light pipe; the middle sleeve is sleeved outside the light pipe and is arranged close to the lower end of the light pipe; the central tube is sleeved outside the light pipe and is positioned between the main body cylinder and the middle sleeve, one end of the central tube is connected to the main body cylinder, and the other end of the central tube is connected to the middle sleeve; the tooth ring pressing sleeve is sleeved outside the central tube; the cylinder sealing seat is sleeved outside the central tube and is abutted to the middle sleeve; the sealing cylinder is sleeved outside the central tube and is positioned between the toothed ring pressing sleeve and the sealing cylinder seat, one end of the sealing cylinder is abutted to the toothed ring pressing sleeve, the other end of the sealing cylinder is abutted to the sealing cylinder seat, and the sealing cylinder is made of soft metal; the driving piece is arranged between the main body cylinder and the central tube and is used for driving the toothed ring pressing sleeve to move towards the cylinder sealing seat so as to extrude the sealing cylinder. The sealing cylinder is made of soft metal, has good setting effect and high temperature resistance, and can meet the requirements of thick oil thermal recovery working conditions.

Description

Thermal recovery packer

Technical Field

The utility model relates to the technical field of oil extraction equipment, in particular to a thermal recovery packer.

Background

In the thick oil thermal recovery process, multiple times of heat injection are needed to be carried out underground, and the common heat injection medium is steam with the temperature of 350-400 ℃, so that the yield of a thick oil region is improved. However, due to the geological condition difference of the underground different-depth section layers, in order to operate the different section layers in a targeted manner, the different section layers need to be sealed by using a separation device.

At present, a conventional packer mostly adopts an elastically deformable packing rubber barrel, and the setting operation is realized when the packer is deformed under pressure. However, in the thick oil thermal recovery process, the packing rubber barrel can undergo multiple high and low temperature changes due to multiple times of heat injection, and in practice, the phenomenon that the packing rubber barrel subjected to the high and low temperature changes is prone to occurrence of sealing failure is found, namely, the packing rubber barrel adopted by the existing packer is difficult to meet the requirements of the thick oil thermal recovery working condition.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model aims to provide a thermal recovery packer which is high-temperature resistant and can meet the working condition requirements of thick oil thermal recovery.

The embodiment of the utility model is realized by the following technical scheme:

a thermal packer comprising: a light pipe; the main body cylinder is sleeved outside the light pipe and is arranged close to the upper end of the light pipe; the middle sleeve is sleeved outside the light pipe and is arranged close to the lower end of the light pipe; the central tube is sleeved outside the light pipe and is positioned between the main body cylinder and the middle sleeve, one end of the central tube is connected to the main body cylinder, and the other end of the central tube is connected to the middle sleeve; the tooth ring pressing sleeve is sleeved outside the central tube; the cylinder sealing seat is sleeved outside the central tube and is abutted to the middle sleeve; the sealing cylinder is sleeved outside the central tube and is positioned between the toothed ring pressing sleeve and the sealing cylinder seat, one end of the sealing cylinder is abutted to the toothed ring pressing sleeve, the other end of the sealing cylinder is abutted to the sealing cylinder seat, and the sealing cylinder is made of soft metal; the driving piece is arranged between the main body cylinder and the central tube and is used for driving the toothed ring pressing sleeve to move towards the cylinder sealing seat so as to extrude the sealing cylinder.

According to a preferred embodiment, the thermal recovery packer further comprises an upper cone and a lower cone sleeved outside the central tube, and a slip piece is arranged between the lower cone and the upper cone; the upper cone and the lower cone are embedded between the slip piece and the central pipe; the upper cone is connected to the cartridge seat, and the lower cone is connected to the intermediate sleeve.

According to a preferred embodiment, a stepped bore is formed in one end of the main body barrel, which is close to the middle sleeve, and a large hole Duan Kaojin of the stepped bore is formed in one side of the middle sleeve; the central pipe is connected to the inner wall of the small hole section of the stepped hole cavity in a threaded manner; the driving piece is arranged in the big hole section.

According to a preferred embodiment, the driving member comprises a piston member and a piston connecting sleeve, one end of the piston connecting sleeve is embedded in the big hole section and is abutted to the piston member, and the other end of the piston connecting sleeve is connected to the toothed ring pressing sleeve; the piston connecting sleeve is connected with the main body cylinder through a first fixed pin nail; the piston piece is in sealing fit with the inner wall of the large hole section and the outer wall of the central tube; the main body cylinder is provided with a pressure oil hole which is communicated to the large hole section and is used for injecting pressure oil into the large hole section so as to drive the piston member to move towards the middle sleeve.

According to a preferred embodiment, a ratchet is arranged on the outer wall of the central tube, a ratchet ring matched with the ratchet is sleeved outside the central tube, one end of the ratchet ring is abutted to the piston connecting sleeve, and the other end of the ratchet ring is abutted to the gear ring pressing sleeve; the ratchet is obliquely arranged towards one side of the middle sleeve.

According to a preferred embodiment, the middle sleeve is embedded with a locking claw, and the locking claw is sleeved outside the light pipe; the outer sliding sleeve of the light pipe is provided with a deblocking block, the deblocking block is connected to the middle sleeve through a deblocking pin, and the deblocking block is connected to the light pipe through a second fixing pin; the deblocking block is positioned at the claw hook part of the locking claw and between the claw hook part and the light pipe, so that the claw hook part is hooked and connected with the inner wall of the middle sleeve; the upper end of the locking claw is connected to the central tube; the shearing force of the deblocking pin is greater than the shearing force of the second fixing pin.

According to a preferred embodiment, the lower end of the light pipe is provided with a tail variable buckle and a shearing ring, and the shearing ring is arranged close to one side of the upper end of the light pipe; the deblocking block is connected to the shear ring by the second securing pin.

According to a preferred embodiment, the intermediate sleeve is provided with a limit pin, and the limit pin is arranged between the deblocking pin and the second fixing pin in the axial direction of the light pipe; the limiting pin is abutted to the deblocking block and used for limiting the deblocking block to prevent the deblocking block from being separated from the middle sleeve downwards in the axial direction of the light pipe; the shearing force of the limit pin is larger than that of the unsealing pin.

According to a preferred embodiment, conical cavities are formed in two ends of the sealing cylinder, and the toothed ring pressing sleeve and the cylinder sealing seat are respectively embedded in the adjacent conical cavities.

According to a preferred embodiment, the sealing cylinder outer wall is provided with a deformation groove in the region of the conical cavity in the axial direction of the sealing cylinder.

The technical scheme of the embodiment of the utility model has at least the following advantages and beneficial effects:

after the thermal recovery packer is put into a casing pipe with a specified depth, the toothed ring pressing sleeve is driven by the driving piece so as to enable the toothed ring pressing sleeve to move on the central pipe towards the sealing cylinder seat along the axial direction of the central pipe, the sealing cylinder is made of soft metal materials, and the toothed ring pressing sleeve and the sealing cylinder seat squeeze the sealing cylinder to enable the sealing cylinder to generate plastic deformation along with the continuous action of the driving piece, and when the sealing cylinder is deformed to be tightly attached to the inner wall of the casing pipe, the setting action of the thermal recovery packer can be completed; the sealing cylinder is made of soft metal, is high-temperature resistant, can meet the high-temperature working condition requirement of a thick oil thermal recovery process, and can ensure good sealing performance.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a thermal packer according to an embodiment of the present utility model;

FIG. 2 is an enlarged schematic view of a portion of the structure shown at A in FIG. 1;

FIG. 3 is an enlarged schematic view of a portion of the structure at B in FIG. 1;

fig. 4 is an enlarged schematic view of a portion of the structure at C in fig. 1.

Icon: 1. a light pipe; 2. a main body cylinder; 3. a central tube; 4. a piston member; 5. a piston connecting sleeve; 51. a limit step; 6. a ratchet push ring; 7. a ratchet ring; 8. pressing the toothed ring; 9. a sealing cylinder; 91. a conical cavity; 92. a deformation groove; 93. a sealing part; 94. a main body portion; 10. a cylinder sealing seat; 11. an upper cone; 12. a lower cone; 13. slip sleeve; 14. a slip member; 15. a middle sleeve; 16. a locking claw; 17. deblocking; 18. deblocking the pin; 19. limit pins; 20. a sixth fixed pin; 21. a second fixed pin; 22. a third fixed pin; 23. a compacting sleeve; 24. a fourth fixed pin; 25. a fifth fixed pin; 26. a first fixed pin; 27. a shear ring; 28. a pressure oil hole; 29. tail part changing buckle; 30. the head is changed to be buckled.

Detailed Description

For a better understanding and implementation, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model.

In the description of the present utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

Referring to fig. 1 to 4, a thermal packer includes a light pipe 1, a main body cylinder 2, a middle sleeve 15, a central tube 3, a toothed ring pressing sleeve 8, a cylinder sealing seat 10, a sealing cylinder 9 and a driving member, wherein: the main body cylinder 2 is sleeved outside the light pipe 1 and is arranged close to the upper end of the light pipe 1; the middle sleeve 15 is sleeved outside the light pipe 1 and is arranged near the lower end of the light pipe 1, and the middle sleeve 15 is connected to the light pipe 1; the central tube 3 is sleeved outside the light pipe 1 and is positioned between the main body cylinder 2 and the middle sleeve 15, one end of the central tube 3 is connected to the main body cylinder 2, and the other end is connected to the middle sleeve 15; the tooth ring pressing sleeve 8 is sleeved outside the central tube 3; the cylinder sealing seat 10 is sleeved outside the central tube 3 and is abutted to the middle sleeve 15; the sealing cylinder 9 is sleeved outside the central tube 3 and is positioned between the toothed ring pressing sleeve 8 and the sealing cylinder seat 10, one end of the sealing cylinder 9 is abutted to the toothed ring pressing sleeve 8, the other end is abutted to the sealing cylinder seat 10, and the sealing cylinder 9 is made of soft metal; the driving piece is arranged between the main body cylinder 2 and the central tube 3 and is used for driving the toothed ring pressing sleeve 8 to move towards the cylinder sealing seat 10 so as to press the sealing cylinder 9.

Specifically, as shown in fig. 1, when the thermal recovery packer is used, after the thermal recovery packer is lowered into a casing pipe with a specified depth, the toothed ring pressing sleeve 8 is driven by the driving piece so as to enable the toothed ring pressing sleeve to move on the central pipe 3 along the axial direction of the central pipe 3 towards the sealing cylinder seat 10, the sealing cylinder 9 is made of soft metal materials, the toothed ring pressing sleeve 8 and the sealing cylinder seat 10 squeeze the sealing cylinder 9 to enable the sealing cylinder 9 to generate plastic deformation along with the continuous action of the driving piece, expansion deformation occurs in the radial direction, and when the sealing cylinder 9 is deformed to be tightly attached to the inner wall of the casing pipe, the setting action of the thermal recovery packer can be completed.

In the embodiment, the sealing cylinder 9 of the thermal recovery packer is made of soft metal, is high-temperature resistant, can meet the high-temperature working condition requirement of the thick oil thermal recovery process, and can ensure good sealing performance.

In this embodiment, the packing element is preferably made of red copper.

In order to further improve the tightness between the inner wall of the sealing cylinder 9 and the outer wall of the central tube 3, a metal C-ring is arranged between the inner wall of the sealing cylinder 9 and the outer wall of the central tube 3. The thermal recovery packer is made of metal, so that the thermal recovery packer can stably work at 400 ℃ for a long time without failure.

Further, as shown in fig. 3, both ends of the sealing cylinder 9 are provided with conical cavities 91, and the toothed ring press sleeve 8 and the cylinder sealing seat 10 are respectively embedded in the adjacent conical cavities 91. In this embodiment, the tooth ring pressing sleeve 8 and the sealing cylinder seat 10 are both configured with conical protrusions at one end near the sealing cylinder 9, and the conical protrusions are adapted to the conical cavity 91. The conical protruding part on the tooth ring pressing sleeve 8 is embedded in the conical cavity 91 adjacent to the tooth ring pressing sleeve, and the conical protruding part on the cylinder sealing seat 10 is embedded in the conical cavity 91 adjacent to the tooth ring pressing sleeve. When in use, the conical protruding part continuously stretches into the conical cavity 91, so that the part of the sealing cylinder 9 in the area of the conical cavity 91 is rapidly expanded and deformed outwards along the radial direction of the central tube 3, and the sleeve is rapidly sealed. The conical protruding part and the conical cavity 91 are matched in structure, so that plastic deformation of the sealing cylinder 9 outwards along the radial direction of the central tube 3 is easier to occur after the sealing cylinder 9 is pressed, two sealing areas are rapidly formed in the axial direction of the central tube 3, and the reliability of the sealing cylinder 9 is improved.

Further, a deformation groove 92 is formed around the outer wall of the seal cylinder 9, and the deformation groove 92 is located in the area of the tapered cavity 91 in the axial direction of the seal cylinder 9. In this embodiment, both ends of the seal cartridge 9 are provided with a deformation groove 92. For convenience of description, a region between the deformation groove 92 in the axial direction of the seal cartridge 9 and the end adjacent to the deformation groove 92 is defined as a seal portion 93; the region between the two deformation grooves 92 is a main body 94. In this embodiment, the outer diameter of the seal portion 93 is larger than the outer diameter of the main body portion 94. The external diameter design that sealing portion 93 external diameter is greater than main part 94 makes sealing portion 93 outer wall can better laminating to the sleeve pipe inner wall faster at sealing tube 9 deformation in-process, and deformation groove 92 is favorable to sealing portion 93 to turn over the book deformation for main part 94, avoids influencing main part 94 and leads to sealing failure between sealing tube 9 inner wall and the center tube 3 outer wall when sealing portion 93 warp. In this embodiment, a metal C-ring fits within the region of the body portion 94.

In other embodiments, the number of deformation grooves 92 may be set as desired, and is not limited to one at one end of the seal cartridge 9.

In the embodiment, the thermal recovery packer further comprises an upper cone 11 and a lower cone 12 sleeved outside the central tube 3, and a slip piece 14 is arranged between the lower cone 12 and the upper cone 11; the upper cone 11 and the lower cone 12 are embedded between the slip piece 14 and the central tube 3; the upper cone 11 is connected to the cartridge holder 10 and the lower cone 12 is connected to the intermediate sleeve 15. In this embodiment, the central tube 3 is sleeved with a slip sleeve 13, and the upper cone 11, the lower cone 12 and the slip member 14 are all arranged between the slip sleeve 13 and the central tube 3. The slip sleeve 13 is provided with a through hole, and when the upper cone 11 and the lower cone 12 move in opposite directions, the slip piece 14 is exposed out of the through hole under the action of the conical surfaces of the upper cone 11 and the lower cone 12, so that the slip is abutted to the inner wall of the sleeve, and the thermal recovery setting device is fixed in the sleeve. Specifically, as shown in fig. 1, the upper cone 11 is in threaded connection with the seal cylinder seat 10, the lower cone 12 is in threaded connection with the middle sleeve 15, the seal cylinder seat 10 is connected with the central tube 3 through a fourth fixing pin 24, and the upper cone 11 is connected with the slip sleeve 13 through a fifth fixing pin 25. During setting, the fourth and fifth anchor pins 24, 25 shear under the action of the driver. That is, the driving member drives the toothed ring pressing sleeve 8 to move towards the middle sleeve 15, the toothed ring pressing sleeve 8 drives the sealing cylinder seat 10 and the upper cone 11 to synchronously move through the sealing cylinder 9, so that the fourth fixing pin 24 and the fifth fixing pin 25 are sequentially sheared, at this time, the slip member 14 is unfolded under the extrusion of the upper cone 11 and the lower cone 12 and is attached to the inner wall of the casing, at this time, the thermal recovery packer is fixed in the casing, and along with the driving of the driving member, the sealing cylinder 9 deforms to realize setting under the extrusion of the toothed ring pressing sleeve 8 and the sealing cylinder seat 10.

Further, a guiding slot is axially formed in the slip sleeve 13 along the central tube 3, and a third fixing pin 22 is arranged on the lower cone 12, and the third fixing pin 22 is slidably nested in the guiding slot. When in use, the upper cone 11 and the slip sleeve 13 synchronously move downwards before the fifth fixed pin 25 on the upper cone 11 is sheared; after the fifth fixing pin 25 is sheared, the third fixing pin 22 is used for preventing the slip sleeve 13 from rotating circumferentially, so as to ensure that the slip piece 14 can be reset smoothly. In this embodiment, as shown in fig. 1, one end of the main body cylinder 2 near the middle sleeve 15 is provided with a stepped hole cavity, and a large hole section of the stepped hole cavity is arranged near one side of the middle sleeve 15; the central tube 3 is connected to the inner wall of the small hole section of the stepped hole cavity in a threaded manner; the driving piece is arranged in the big hole section. Further, the driving piece comprises a piston piece 4 and a piston connecting sleeve 5, one end of the piston connecting sleeve 5 is embedded in the large hole section and is abutted to the piston piece 4, and the other end of the piston connecting sleeve 5 is connected to the toothed ring pressing sleeve 8 through threads; the piston connecting sleeve 5 is connected with the main body cylinder 2 through a first fixed pin 26; the piston member 4 is in sealing fit with the inner wall of the large hole section and the outer wall of the central tube 3; the main body cylinder 2 is provided with a pressure oil hole 28, and the pressure oil hole 28 is communicated with the large hole section and is used for injecting pressure oil into the large hole section to drive the piston member 4 to move towards the middle sleeve 15. In this embodiment, the pressure oil hole 28 is formed on the end surface of the main body cylinder 2, and extends to the large hole section of the stepped bore in the axial direction of the main body cylinder 2, specifically, the pressure oil hole 28 is connected to the step surface at the junction of the large hole section and the small hole section.

In order to realize the sealing between the piston member 4 and the outer wall of the central tube 3 and the inner wall of the large hole section, both ends of the piston member 4 are provided with metal C-shaped rings, and the metal C-shaped rings are fixed with the piston member 4 in a mode of screwing the C-shaped ring fixing sleeve at the end part of the piston member 4. In use, hydraulic control lines are used to inject pressure oil into the stepped bore through the pressure oil holes 28 to drive the piston member 4 to move in the large bore section towards the piston connecting sleeve 5, at which time the first fixing pin 26 is sheared, and then with synchronous movement of the piston connecting sleeve 5 and the toothed ring pressing sleeve 8, the cylinder sealing seat 10 and the upper cone 11 are driven to synchronously move, so that the fourth fixing pin 24 and the fifth fixing pin 25 are sequentially sheared, the thermal recovery separator is fixed by the slip member 14, and setting is achieved by the sealing cylinder 9. In this embodiment, in the subsequent use process, if the tightness of the sealing cylinder 9 is reduced, the piston member 4 can be continuously moved towards the middle sleeve 15 by continuously filling the pressure oil into the pressure oil hole 28, so that the sealing cylinder 9 is continuously extruded by the toothed ring pressing sleeve 8 and the sealing cylinder seat 10 to increase the deformation amount thereof, and the sealing performance of the sealing cylinder 9 is ensured.

Further, as shown in fig. 2, a ratchet is arranged on the outer wall of the central tube 3, a ratchet ring 7 matched with the ratchet is sleeved outside the central tube 3, one end of the ratchet ring 7 is abutted to the piston connecting sleeve 5, and the other end is abutted to the gear ring pressing sleeve 8; the ratchet is inclined toward one side of the intermediate sleeve 15. In this embodiment, a limiting step 51 is disposed on the inner wall of the piston connecting sleeve 5, a ratchet push ring 6 is disposed between the limiting step 51 and the ratchet ring 7, and the ratchet push ring 6 is sleeved outside the central tube 3. When the ratchet ring pressing sleeve is used, when the piston connecting sleeve 5 moves towards the middle sleeve 15, the limiting step 51 pushes the ratchet push ring 6 and the ratchet ring 7 to move in the same direction, namely move downwards, and the ratchet ring 7 can only move downwards but not upwards under the action of a ratchet, so that the ratchet ring 7 abutted to the ratchet ring pressing sleeve 8 can ensure that the ratchet ring pressing sleeve 8 does not move upwards after the sealing cylinder 9 is extruded, namely the ratchet ring pressing sleeve 8 realizes unidirectional limiting (can not move upwards) under the action of the ratchet ring 7, and the ratchet ring pressing sleeve 8 can be prevented from loosening in the setting process and has high safety.

In this embodiment, as shown in fig. 1 and 4, a locking claw 16 is embedded in the middle sleeve 15, and the locking claw 16 is sleeved outside the light pipe 1; the outer sliding sleeve of the light pipe 1 is provided with a deblocking block 17, the deblocking block 17 is connected to the middle sleeve 15 through a deblocking pin 18, and the deblocking block 17 is connected to the light pipe 1 through a second fixing pin 21; the deblocking block 17 is positioned at the claw hook part of the locking claw 16 and between the claw hook part and the light pipe 1, so that the claw hook part is hooked and connected with the inner wall of the middle sleeve 15; the upper end of the locking claw 16 is screwed to the center tube 3; the shear force of the unsealing pin 18 is greater than the shear force of the second fixing pin 21. Further, the light pipe 1 is sleeved with a shear ring 27, and the shear ring 27 is fixedly connected to the light pipe 1 through a sixth fixing pin 20. The deblocking 17 is connected to the shear ring 27 by a second fixing pin 21. In use, after setting is completed, after heat injection, the light pipe 1 expands with the rise of temperature, mainly in its axial direction, its length is prolonged, during which the second fixing pin 21 is sheared, and at this time the light pipe 1 can slide freely in the central tube 3.

When the light pipe 1 needs to be unsealed, the tail variable buckle 29 arranged at the lower end of the light pipe 1 moves upwards to be abutted to the unsealing block 17, when the lifting force of the light pipe 1 reaches a certain value, the unsealing pin 18 is sheared, the light pipe 1 continues to be lifted, the unsealing block 17 continues to move upwards and is separated from the claw hook part of the locking claw 16, at the moment, the claw hook part is separated from the middle sleeve 15, the middle sleeve 15 and the lower cone 12, the slip sleeve 13, the slip piece 14, the upper cone 11, the sealing cylinder seat 10 and the sealing cylinder 9 slide downwards along the outer wall of the central pipe 3 under the action of gravity until the lower cone 12 is abutted to the upper end of the locking claw 16. In this process, the slip member 14 is retracted into the slip sleeve 13 due to the disappearance of the extrusion action of the upper cone 11 and the lower cone 12, so as to separate from the inner wall of the casing, and the sealing cylinder 9 also loses extrusion limit of the toothed ring press sleeve 8 and the seal cylinder seat 10, and as the sealing cylinder is made of soft metal, the sealing part 93 is extruded and worn by the inner wall of the casing along with the continuous lifting of the light pipe 1, so that deblocking and recovery of the packer are realized.

In this embodiment, the middle sleeve 15 is provided with a limit pin 19, and the limit pin 19 is located between the unsealing pin 18 and the second fixing pin 21 in the axial direction of the light pipe 1; a limiting pin 19 is abutted to the deblocking block 17 for limiting the deblocking block 17 to prevent it from being separated from the intermediate sleeve 15 downward in the axial direction of the light pipe 1; the shearing force of the limit pin 19 is greater than that of the unsealing pin 18.

In the embodiment, the upper end of the light pipe 1 is provided with a head variable buckle 30, the light pipe 1 is sleeved with a pressing sleeve 23, and the pressing sleeve 23 is embedded in the main body cylinder 2 and is in threaded connection with the main body cylinder 2; the compression sleeve 23 is axially between the head-changing button 30 and the center tube 3 in the light pipe 1. The light pipe 1 and the main body cylinder 2 are sealed by adopting a metal C-shaped ring, and the metal C-shaped ring is positioned between the compression sleeve 23 and the central tube 3.

In summary, the working principle of the utility model is as follows:

setting: injecting pressure oil into the stepped bore cavity through the pressure oil hole 28, so that the piston piece 4 drives the piston connecting sleeve 5 and the tooth ring pressing sleeve 8 to synchronously move downwards, and the first fixed pin 26 is sheared in the process; subsequently, the sealing cylinder 9 drives the cylinder seat 10 and the upper cone 11 to synchronously move downwards, and the fourth fixed pin 24 and the fifth fixed pin 25 are sequentially sheared; the slip piece 14 is unfolded from the slip sleeve 13 under the extrusion of the upper cone 11 and the lower cone 12 and is abutted against the inner wall of the casing so as to fix the thermal production packer in the casing; finally, with further downward movement of the piston element 4, the toothed ring pressing sleeve 8 is matched with the sealing cylinder seat 10 to press the sealing cylinder 9 to deform and tightly fit to the inner wall of the sleeve, so that setting is realized.

Heat injection: after setting, heat is injected, the light pipe 1 expands under heat, the second fixing pin 21 shears, and the light pipe 1 can slide freely in the central pipe 3.

Deblocking: the light pipe 1 is lifted up, the tail variable buckle 29 arranged at the lower end of the light pipe 1 moves upwards to drive the deblocking block 17, the deblocking pin 18 is sheared, the light pipe 1 is lifted up continuously, the deblocking block 17 moves upwards continuously and is separated from the claw hook part of the locking claw 16, at the moment, the claw hook part is separated from the middle sleeve 15, the lower cone 12, the slip sleeve 13, the slip piece 14, the upper cone 11, the sealing cylinder seat 10 and the sealing cylinder 9 slide downwards along the outer wall of the central pipe 3 under the action of gravity until the lower cone 12 is abutted to the upper end of the locking claw 16. In the process, the slip piece 14 is retracted into the slip sleeve 13 due to the disappearance of the extrusion action of the upper cone 11 and the lower cone 12, so that the slip piece is separated from the inner wall of the sleeve, the sealing cylinder 9 also loses extrusion limit of the toothed ring pressing sleeve 8 and the sealing cylinder seat 10, and along with the continuous lifting of the light pipe 1, the sealing part 93 is extruded and worn by the inner wall of the sleeve, so that the deblocking and the recovery of the packer are realized.

The technical means disclosed by the scheme of the utility model is not limited to the technical means disclosed by the embodiment, and also comprises the technical scheme formed by any combination of the technical features. It should be noted that modifications and adaptations to the utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.

Claims

1. A thermal recovery packer, comprising:

a light pipe (1);

the main body cylinder (2) is sleeved outside the light pipe (1) and is arranged close to the upper end of the light pipe (1);

the middle sleeve (15) is sleeved outside the light pipe (1) and is arranged close to the lower end of the light pipe (1);

the central tube (3) is sleeved outside the light pipe (1) and is positioned between the main body cylinder (2) and the middle sleeve (15), one end of the central tube (3) is connected to the main body cylinder (2), and the other end of the central tube is connected to the middle sleeve (15);

the tooth ring pressing sleeve (8) is sleeved outside the central tube (3);

the cylinder sealing seat (10) is sleeved outside the central tube (3) and is abutted to the middle sleeve (15);

the sealing cylinder (9) is sleeved outside the central tube (3) and is positioned between the toothed ring pressing sleeve (8) and the sealing cylinder seat (10), one end of the sealing cylinder (9) is abutted to the toothed ring pressing sleeve (8), the other end of the sealing cylinder is abutted to the sealing cylinder seat (10), and the sealing cylinder (9) is made of soft metal materials;

the driving piece is arranged between the main body cylinder (2) and the central tube (3) and is used for driving the toothed ring pressing sleeve (8) to move towards the cylinder sealing seat (10) so as to extrude the sealing cylinder (9).

2. The thermal recovery packer according to claim 1, further comprising an upper cone (11) and a lower cone (12) sleeved outside the central tube (3), wherein a slip member (14) is installed between the lower cone (12) and the upper cone (11);

the upper cone (11) and the lower cone (12) are embedded between the slip piece (14) and the central pipe (3);

the upper cone (11) is connected to the cartridge seat (10) and the lower cone (12) is connected to the intermediate sleeve (15).

3. The thermal recovery packer according to claim 1, wherein a stepped bore is formed in one end of the main body cylinder (2) close to the middle sleeve (15), and a large hole Duan Kaojin of the stepped bore is formed in one side of the middle sleeve (15);

the central tube (3) is connected to the inner wall of the small hole section of the stepped hole cavity in a threaded manner;

the driving piece is arranged in the big hole section.

4. A thermal packer according to claim 3, characterized in that the driving element comprises a piston element (4) and a piston connection sleeve (5), one end of the piston connection sleeve (5) is embedded in the large hole section and is abutted to the piston element (4), and the other end of the piston connection sleeve (5) is connected to the toothed ring press sleeve (8);

the piston connecting sleeve (5) is connected with the main body cylinder (2) through a first fixed pin (26);

the piston piece (4) is in sealing fit with the inner wall of the large hole section and the outer wall of the central tube (3);

the main body cylinder (2) is provided with a pressure oil hole (28), and the pressure oil hole (28) is communicated into the big hole section and is used for injecting pressure oil into the big hole section so as to drive the piston piece (4) to move towards the middle sleeve (15).

5. The thermal recovery packer according to claim 4, characterized in that ratchets are arranged on the outer wall of the central tube (3), a ratchet ring (7) matched with the ratchets is sleeved outside the central tube (3), one end of the ratchet ring (7) is abutted to the piston connecting sleeve (5), and the other end of the ratchet ring is abutted to the toothed ring pressing sleeve (8);

the ratchet is arranged obliquely towards one side of the middle sleeve (15).

6. The thermal recovery packer according to any one of claims 1-5, wherein a locking claw (16) is embedded in the middle sleeve (15), and the locking claw (16) is sleeved outside the light pipe (1);

the outer sliding sleeve of the light pipe (1) is provided with a deblocking block (17), the deblocking block (17) is connected to the middle sleeve (15) through a deblocking pin (18), and the deblocking block (17) is connected to the light pipe (1) through a second fixing pin (21);

the deblocking block (17) is positioned at the claw hook part of the locking claw (16) and between the claw hook part and the light pipe (1) so that the claw hook part is hooked and connected with the inner wall of the middle sleeve (15);

the upper end of the locking claw (16) is connected to the central tube (3);

the shearing force of the deblocking pin (18) is greater than the shearing force of the second fixing pin (21).

7. The thermal recovery packer according to claim 6, wherein a tail variable buckle (29) and a shearing ring (27) are arranged at the lower end of the light pipe (1), and the shearing ring (27) is arranged at one side close to the upper end of the light pipe (1);

the deblocking block (17) is connected to the shear ring (27) by the second fixing pin (21).

8. A thermal packer according to claim 7, characterized in that the intermediate sleeve (15) is provided with a limit pin (19), which limit pin (19) is located axially of the light pipe (1) between the deblocking pin (18) and the second fixation pin (21);

a limiting pin (19) is abutted to the deblocking block (17) and is used for limiting the deblocking block (17) to prevent the deblocking block from being separated from the middle sleeve (15) downwards in the axial direction of the light pipe (1);

the shearing force of the limit pin (19) is larger than that of the deblocking pin (18).

9. The thermal recovery packer according to claim 1, wherein conical cavities (91) are formed at two ends of the sealing cylinder (9), and the toothed ring pressing sleeve (8) and the cylinder sealing seat (10) are respectively embedded in the adjacent conical cavities (91).

10. A thermal recovery packer according to claim 9, characterized in that the outer wall of the sealing cylinder (9) is provided with deformation grooves (92) in the ring, which deformation grooves (92) are in the area of the conical cavity (91) in the axial direction of the sealing cylinder (9).