Thermal recovery packer

Abstract

The application provides a thermal recovery packer, which comprises a light pipe, a main cylinder, an intermediate sleeve, a center pipe, a tooth ring pressing sleeve, a sealing cylinder and a driving member. The main cylinder is sleeved outside the light pipe and arranged close to the upper end of the light pipe. The intermediate sleeve is sleeved outside the light pipe and arranged close to the lower end of the light pipe. The center pipe is sleeved outside the light pipe and arranged between the main cylinder and the intermediate sleeve. One end of the center pipe is connected to the main cylinder, and the other end is connected to the intermediate sleeve. The tooth ring pressing sleeve is sleeved outside the center pipe. The sealing cylinder is sleeved outside the center pipe and abuts against the intermediate sleeve. The sealing cylinder is made of soft metal material and is arranged between the tooth ring pressing sleeve and the sealing cylinder. One end of the sealing cylinder abuts against the tooth ring pressing sleeve, and the other end abuts against the sealing cylinder. The driving member is arranged between the main cylinder and the center pipe and is used for driving the tooth ring pressing sleeve to move towards the sealing cylinder to extrude the sealing cylinder. The sealing cylinder is made of soft metal material, has good setting effect, is resistant to high temperature and can meet the working condition requirements of thick oil thermal recovery.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil extraction equipment, and particularly relates to a thermal recovery packer. BACKGROUND

[0002] In the process of heavy oil thermal recovery, heat injection needs to be carried out in multiple rounds in the downhole, and the general heat injection medium is steam with a temperature of 350-400 DEG C, so as to improve the production of heavy oil zones. Due to the difference in geological conditions of different depth sections of the downhole, in order to carry out targeted operations on different sections, it is necessary to use a partition to seal different sections.

[0003] At present, the conventional packer mostly uses an elastically deformable sealing sleeve to realize setting operation when being deformed under pressure. However, in the process of heavy oil thermal recovery, the sealing sleeve will undergo multiple high-low temperature changes due to multiple rounds of heat injection, and it is found in practice that the sealing sleeve after undergoing high-low temperature changes is prone to sealing failure, that is, the sealing sleeve used by the existing packer is difficult to meet the needs of the working conditions of heavy oil thermal recovery. SUMMARY

[0004] In view of the deficiencies of the prior art, the purpose of the present application is to provide a thermal recovery packer which is resistant to high temperature and can meet the needs of the working conditions of heavy oil thermal recovery.

[0005] The embodiments of the present application are implemented by the following technical solutions:

[0006] A thermal recovery packer comprises a smooth pipe, a main body sleeve which is sleeved outside the smooth pipe and is arranged close to the upper end of the smooth pipe, an intermediate sleeve which is sleeved outside the smooth pipe and is arranged close to the lower end of the smooth pipe, a central pipe which is sleeved outside the smooth pipe and is located between the main body sleeve and the intermediate sleeve, one end of the central pipe being connected to the main body sleeve and the other end being connected to the intermediate sleeve, a tooth ring pressure sleeve which is sleeved outside the central pipe, a sealing sleeve seat which is sleeved outside the central pipe and abuts against the intermediate sleeve, a sealing sleeve which is sleeved outside the central pipe and is located between the tooth ring pressure sleeve and the sealing sleeve seat, one end of the sealing sleeve abutting against the tooth ring pressure sleeve and the other end abutting against the sealing sleeve seat, the sealing sleeve being made of soft metal, and a driving member which is arranged between the main body sleeve and the central pipe and is used to drive the tooth ring pressure sleeve to move towards the sealing sleeve seat to press the sealing sleeve.

[0007] According to a preferred embodiment, the thermal recovery packer further comprises an upper cone and a lower cone which are sleeved outside the central pipe, and a slip member is arranged between the upper cone and the lower cone; the upper cone and the lower cone are embedded between the slip member and the central pipe; the upper cone is connected to the sealing sleeve seat, and the lower cone is connected to the intermediate sleeve.

[0008] According to a preferred embodiment, the main barrel is provided with a stepped bore cavity near one end of the intermediate sleeve, a large hole section of the stepped bore cavity is arranged near one side of the intermediate sleeve; the center tube is threadedly connected to the inner wall of the small hole section of the stepped bore cavity; and the driving member is mounted in the large hole section.

[0009] 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 large hole section and abuts against the piston member, the other end of the piston connecting sleeve is connected to the gear ring pressing sleeve; the piston connecting sleeve is connected to the main barrel through a first fixed pin; the piston member is sealingly fitted to the inner wall of the large hole section and the outer wall of the center tube; and a pressure oil hole is formed in the main barrel and communicates with the large hole section, for injecting pressure oil into the large hole section to drive the piston member to move towards the intermediate sleeve.

[0010] According to a preferred embodiment, the outer wall of the center tube is provided with a ratchet, and the center tube is provided with a ratchet ring matched with the ratchet, one end of the ratchet ring abuts against the piston connecting sleeve, and the other end abuts against the gear ring pressing sleeve; the ratchet is arranged obliquely towards one side of the intermediate sleeve.

[0011] According to a preferred embodiment, the intermediate sleeve is embedded with a locking claw, and the locking claw is sleeved on the outer light pipe; the outer light pipe is slidingly sleeved with an unblocking block, the unblocking block is connected to the intermediate sleeve through an unblocking pin, and the unblocking block is connected to the light pipe through a second fixed pin; the unblocking block is located in the claw hook portion of the locking claw and between the claw hook portion and the light pipe, so that the claw hook portion is hooked and connected to the inner wall of the intermediate sleeve; the upper end of the locking claw is connected to the center tube; and the shearing force of the unblocking pin is greater than that of the second fixed pin.

[0012] 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 near one side of the upper end of the light pipe; the unblocking block is connected to the shearing ring through the second fixed pin.

[0013] According to a preferred embodiment, the intermediate sleeve is provided with a limiting pin between the unblocking pin and the second fixed pin in the axial direction of the light pipe; the limiting pin abuts against the unblocking block, for limiting the unblocking block to prevent it from being separated from the intermediate sleeve downward in the axial direction of the light pipe; and the shearing force of the limiting pin is greater than that of the unblocking pin.

[0014] According to a preferred embodiment, both ends of the sealing barrel are provided with tapered cavities, and the gear ring pressing sleeve and the sealing barrel seat are respectively embedded in the adjacent tapered cavities.

[0015] According to a preferred embodiment, a deformation groove is arranged on the outer wall of the sealing cylinder, and the deformation groove is in the conical cavity region in the axial direction of the sealing cylinder.

[0016] The technical scheme of the embodiment of the present application has at least the following advantages and beneficial effects:

[0017] After the thermal recovery packer of the present application is lowered into the casing at a specified depth, the tooth ring pressure sleeve is driven by the driving member to move on the central pipe in the axial direction of the central pipe towards the sealing cylinder seat. The sealing cylinder is made of soft metal material. With the continuous action of the driving member, the tooth ring pressure sleeve and the sealing cylinder seat extrude the sealing cylinder to cause plastic deformation of the sealing cylinder, and the sealing cylinder is deformed in the radial direction. When the sealing cylinder is deformed to tightly fit the inner wall of the casing, the setting action of the thermal recovery packer can be completed. The sealing cylinder is made of soft metal material, which is resistant to high temperature and can meet the high temperature working condition requirement of the heavy oil thermal recovery process, and can ensure good sealing performance. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained from these drawings without creative labor.

[0019] Figure 1 The structure schematic diagram of the thermal recovery packer provided by the embodiment of the present application is shown in the figure.

[0020] Figure 2 The structure schematic diagram of the thermal recovery packer provided by the embodiment of the present application is shown in the figure. Figure 1 The local enlarged schematic diagram of the structure at A in the figure is shown in the figure.

[0021] Figure 3 The local enlarged schematic diagram of the structure at B in the figure is shown in the figure. Figure 1 The local enlarged schematic diagram of the structure at B in the figure is shown in the figure.

[0022] Figure 4 The local enlarged schematic diagram of the structure at C in the figure is shown in the figure. Figure 1 The local enlarged schematic diagram of the structure at C in the figure is shown in the figure.

[0023] Icon: 1, light pipe; 2, main body cylinder; 3, center tube; 4, piston piece; 5, piston connecting sleeve; 51, limiting step; 6, ratchet pushing ring; 7, ratchet ring; 8, tooth ring pressing sleeve; 9, sealing cylinder; 91, conical cavity; 92, deformation groove; 93, sealing part; 94, main body part; 10, sealing cylinder seat; 11, upper cone; 12, lower cone; 13, slip sleeve; 14, slip piece; 15, middle sleeve; 16, locking claw; 17, unsealing block; 18, unsealing pin; 19, limiting pin; 20, sixth fixed pin; 21, second fixed pin; 22, third fixed pin; 23, pressing sleeve; 24, fourth fixed pin; 25, fifth fixed pin; 26, first fixed pin; 27, shearing ring; 28, pressure oil hole; 29, tail part variable buckle; 30, head part variable buckle. DETAILED DESCRIPTION

[0024] In order to better understand and implement, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the accompanying drawings in the embodiments of the present application.

[0025] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used herein in the specification merely describe specific embodiments of the present application for the purpose of illustration and are not intended to limit the present application.

[0027] Please refer to Figures 1 to 4The thermal recovery packer comprises a light pipe 1, a main cylinder 2, an intermediate sleeve 15, a central pipe 3, a tooth ring pressing sleeve 8, a sealing cylinder seat 10, a sealing cylinder 9 and a driving member, wherein the main cylinder 2 is sleeved outside the light pipe 1 and arranged close to the upper end of the light pipe 1; the intermediate sleeve 15 is sleeved outside the light pipe 1 and arranged close to the lower end of the light pipe 1, and the intermediate sleeve 15 is connected to the light pipe 1; the central pipe 3 is sleeved outside the light pipe 1 and located between the main cylinder 2 and the intermediate sleeve 15, one end of the central pipe 3 is connected to the main cylinder 2, and the other end is connected to the intermediate sleeve 15; the tooth ring pressing sleeve 8 is sleeved outside the central pipe 3; the sealing cylinder seat 10 is sleeved outside the central pipe 3 and abuts against the intermediate sleeve 15; the sealing cylinder 9 is sleeved outside the central pipe 3 and located between the tooth ring pressing sleeve 8 and the sealing cylinder seat 10, one end of the sealing cylinder 9 abuts against the tooth ring pressing sleeve 8, and the other end abuts against the sealing cylinder seat 10, and the sealing cylinder 9 is made of soft metal; and the driving member is arranged between the main cylinder 2 and the central pipe 3 and used for driving the tooth ring pressing sleeve 8 to move on the central pipe 3 in the axial direction of the central pipe 3 to extrude the sealing cylinder 9.

[0028] Specifically, as shown in the figure, Figure 1 in use, after the thermal recovery packer is lowered into a casing to a specified depth, the tooth ring pressing sleeve 8 is driven by the driving member to move on the central pipe 3 in the axial direction of the central pipe 3 towards the sealing cylinder seat 10, the sealing cylinder 9 is made of soft metal, and with the continuous action of the driving member, the tooth ring pressing sleeve 8 and the sealing cylinder seat 10 extrude the sealing cylinder 9 to make it plastically deform and expand in the radial direction, and when the sealing cylinder 9 is deformed to tightly fit the inner wall of the casing, the setting action of the thermal recovery packer can be completed.

[0029] In the embodiment, the sealing cylinder 9 of the thermal recovery packer is made of soft metal, which is resistant to high temperature and can meet the needs of high-temperature working conditions of the heavy oil thermal recovery process and ensure good sealing performance.

[0030] In the embodiment, preferably, the sealing rubber cylinder is made of red copper.

[0031] In order to further improve the sealing performance between the inner wall of the sealing cylinder 9 and the outer wall of the central pipe 3, a metal C-shaped ring is arranged between the inner wall of the sealing cylinder 9 and the outer wall of the central pipe 3. The thermal recovery packer is made of metal, so that it can work stably at 400℃ for a long time without failure.

[0032] Further, as shown in the figure, Figure 3As shown, both ends of the sealing cylinder 9 are provided with tapered cavities 91, and the tooth ring pressing sleeve 8 and the sealing cylinder seat 10 are respectively embedded in the adjacent tapered cavities 91. In this embodiment, the tooth ring pressing sleeve 8 and the sealing cylinder seat 10 are both provided with tapered protrusions near one end of the sealing cylinder 9, and the tapered protrusions are adapted to the tapered cavities 91. The tapered protrusion on the tooth ring pressing sleeve 8 is embedded in the adjacent tapered cavity 91, and the tapered protrusion on the sealing cylinder seat 10 is embedded in the adjacent tapered cavity 91. In use, as the tapered protrusions continuously extend into the tapered cavities 91, the part of the sealing cylinder 9 in the region of the tapered cavities 91 rapidly expands and deforms radially outwardly of the central pipe 3, thereby achieving rapid sealing of the casing. The structure of the tapered protrusions and the tapered cavities 91 makes the sealing cylinder 9 more likely to plastically deform radially outwardly of the central pipe 3 after being pressed, so that two sealing regions rapidly appear in the axial direction of the central pipe 3, thereby improving the reliability of the sealing cylinder 9.

[0033] Further, a deformation groove 92 is annularly arranged on the outer wall of the sealing cylinder 9, and the deformation groove 92 is in the region of the tapered cavities 91 in the axial direction of the sealing cylinder 9. In this embodiment, the two end portions of the sealing cylinder 9 are each provided with a deformation groove 92. For the convenience of description, the region between the deformation groove 92 and the end portion adjacent to the deformation groove 92 in the axial direction of the sealing cylinder 9 is defined as a sealing portion 93, and the region between the two deformation grooves 92 is defined as a main body portion 94. In this embodiment, the outer diameter of the sealing portion 93 is greater than the outer diameter of the main body portion 94. The design that the outer diameter of the sealing portion 93 is greater than the outer diameter of the main body portion 94 makes the outer wall of the sealing portion 93 better and faster adhere to the inner wall of the casing during the deformation of the sealing cylinder 9, and the deformation groove 92 is beneficial to the folding deformation of the sealing portion 93 relative to the main body portion 94, thereby avoiding the deformation of the sealing portion 93 affecting the main body portion 94 and causing the sealing between the inner wall of the sealing cylinder 9 and the outer wall of the central pipe 3 to fail. In this embodiment, a metal C-ring is arranged in the region of the main body portion 94.

[0034] In other embodiments, the number of deformation grooves 92 can be set as required and is not limited to the setting mode of one at one end of the sealing cylinder 9.

[0035] In this embodiment, the thermal recovery packer further comprises an upper cone 11 and a lower cone 12 sleeved outside the central pipe 3, and 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 both embedded between the slip member 14 and the central pipe 3; the upper cone 11 is connected to the sealing cylinder seat 10, and the lower cone 12 is connected to the intermediate sleeve 15. In this embodiment, a slip sleeve 13 is sleeved outside the central pipe 3, 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 pipe 3. A through hole is formed in the slip sleeve 13, and when the upper cone 11 and the lower cone 12 move towards each other, the slip member 14 is exposed from the through hole under the action of the tapered surfaces of the upper cone 11 and the lower cone 12, so that the slip member abuts against the inner wall of the casing, thereby fixing the thermal recovery setting packer in the casing. Specifically, as shown inFigure 1 As shown, the upper cone 11 is threadedly connected to the sealing sleeve 10, the lower cone 12 is threadedly connected to the intermediate sleeve 15, the sealing sleeve 10 is connected to the central tube 3 by the fourth fixing pin 24, and the upper cone 11 is connected to the slip sleeve 13 by the fifth fixing pin 25. During the setting process, the fourth fixing pin 24 and the fifth fixing pin 25 are sheared by the driving component. That is, the driving component drives the toothed ring pressure sleeve 8 to move towards the intermediate sleeve 15, and the toothed ring pressure sleeve 8 drives the sealing sleeve 10 and the upper cone 11 to move synchronously through the sealing cylinder 9, so that the fourth fixing pin 24 and the fifth fixing pin 25 are sheared in sequence. At this time, the slip 14 unfolds under the compression of the upper cone 11 and the lower cone 12 and fits against the inner wall of the casing. At this time, the thermal recovery packer is fixed inside the casing. With the driving component, under the compression of the toothed ring pressure sleeve 8 and the sealing sleeve 10, the sealing cylinder 9 deforms to achieve setting.

[0036] Furthermore, a guide slot is provided on the slip sleeve 13 along the axial direction of the central tube 3, and a third fixing pin 22 is provided on the lower cone 12, which slides and nests within the guide slot. In use, before the fifth fixing pin 25 on the upper cone 11 is sheared off, the upper cone 11 and the slip sleeve 13 move downwards synchronously; after the fifth fixing pin 25 is sheared off, the third fixing pin 22 prevents the slip sleeve 13 from rotating circumferentially, ensuring that the slip piece 14 can be smoothly reset. In this embodiment, as... Figure 1 As shown, a stepped cavity is provided at one end of the main body cylinder 2 near the intermediate sleeve 15, with the larger section of the stepped cavity located near the intermediate sleeve 15; the central tube 3 is threaded to the inner wall of the smaller section of the stepped cavity; the driving component is installed in the larger section. Further, the driving component includes a piston 4 and a piston connecting sleeve 5. One end of the piston connecting sleeve 5 is embedded in the larger section and abuts against the piston 4, while the other end is threaded to the toothed ring sleeve 8; the piston connecting sleeve 5 is connected to the main body cylinder 2 via a first fixing pin 26; the piston 4 is sealed against the inner wall of the larger section and the outer wall of the central tube 3; a pressure oil hole 28 is provided on the main body cylinder 2, which communicates with the larger section and is used to inject pressure oil into the larger section to drive the piston 4 towards the intermediate sleeve 15. In this embodiment, the pressure oil hole 28 is opened on the end face of the main body cylinder 2 and extends along the axial direction of the main body cylinder 2 to the large hole section of the stepped cavity. Specifically, the pressure oil hole 28 is connected to the stepped surface at the junction of the large hole section and the small hole section.

[0037] In order to realize the sealing of the piston 4 and the outer wall of the central pipe 3 and the inner wall of the large hole section, the metal C-shaped ring is arranged at both ends of the piston 4, and the metal C-shaped ring is fixed with the piston 4 by screwing the C-shaped ring fixing sleeve at the end of the piston 4. In use, the pressure oil is injected into the stepped hole cavity through the pressure oil hole 28 by using the hydraulic control pipeline to drive the piston 4 to move in the large hole section towards the piston connecting sleeve 5, at this time the first fixed pin 26 is sheared, and then with the synchronous movement of the piston connecting sleeve 5 and the tooth ring pressing sleeve 8, the sealing cylinder seat 10 and the upper cone 11 are driven to move synchronously, so that the fourth fixed pin 24 and the fifth fixed pin 25 are sheared in turn, the slip member 14 is fixed to the thermal recovery separator, and the sealing is realized by the sealing cylinder 9. In this embodiment, in the subsequent use process, if the sealing performance of the sealing cylinder 9 is reduced, the piston 4 can continue to move towards the middle sleeve 15 by continuously injecting pressure oil into the pressure oil hole 28, so that the sealing cylinder 9 is continuously extruded by the tooth ring pressing sleeve 8 and the sealing cylinder seat 10 to increase the deformation amount, and the sealing performance of the sealing cylinder 9 is ensured.

[0038] Further, as shown in Figure 2 The outer wall of the central pipe 3 is provided with a ratchet, and the central pipe 3 is provided with a ratchet ring 7 matched with the ratchet, one end of the ratchet ring 7 abuts against the piston connecting sleeve 5, and the other end abuts against the tooth ring pressing sleeve 8; the ratchet is inclinedly arranged towards the middle sleeve 15. In this embodiment, the inner wall of the piston connecting sleeve 5 is provided with a limiting step 51, and the ratchet pushing ring 6 is arranged between the limiting step 51 and the ratchet ring 7, and the ratchet pushing ring 6 is sleeved on the central pipe 3. In use, when the piston connecting sleeve 5 moves towards the middle sleeve 15, the limiting step 51 pushes the ratchet pushing ring 6 and the ratchet ring 7 to move in the same direction, i.e. downwards, and under the action of the ratchet, the ratchet ring 7 can only move downwards and cannot move upwards, so that the ratchet ring 7 abutting against the tooth ring pressing sleeve 8 can ensure that the tooth ring pressing sleeve 8 does not move upwards after extruding the sealing cylinder 9, i.e. the tooth ring pressing sleeve 8 is one-way limited (cannot move upwards) under the action of the ratchet ring 7, which can prevent the tooth ring pressing sleeve 8 from loosening during the setting process, and the safety is high.

[0039] In this embodiment, as shown in Figure 1 and Figure 4As shown, the intermediate sleeve 15 is embedded with a locking claw 16, which is sleeved on the optical tube 1. An unsealing block 17 is slidably sleeved on the optical tube 1 and is connected to the intermediate sleeve 15 through an unsealing pin 18. The unsealing block 17 is connected to the optical tube 1 through a second fixing pin 21. The unsealing block 17 is located at the claw hook part of the locking claw 16 and between the claw hook part and the optical tube 1, so that the claw hook part is hooked and connected to the inner wall of the intermediate sleeve 15. The upper end of the locking claw 16 is threadedly connected to the central tube 3. The shearing force of the unsealing pin 18 is greater than that of the second fixing pin 21. Further, a shearing ring 27 is sleeved on the optical tube 1 and is fixedly connected to the optical tube 1 through a sixth fixing pin 20. The unsealing block 17 is connected to the shearing ring 27 through the second fixing pin 21. In use, after the setting is completed and after the heat is injected, the optical tube 1 expands with the temperature rising, mainly in the axial direction, and the length is extended. In this process, the second fixing pin 21 is sheared off, and at this time, the optical tube 1 can freely slide in the central tube 3.

[0040] When unsealing is needed, the optical tube 1 is lifted upward, and the tail variable buckle 29 installed at the lower end of the optical tube 1 moves upward and abuts against the unsealing block 17. When the lifting force of the optical tube 1 reaches a certain value, the unsealing pin 18 is sheared off, and the optical tube 1 is continuously lifted, and the unsealing block 17 continuously moves upward and is separated from the claw hook part of the locking claw 16. At this time, the claw hook part is separated from the intermediate sleeve 15, and the intermediate sleeve 15, the lower cone 12, the slip sleeve 13, the slip member 14, the upper cone 11, the sealing sleeve seat 10 and the sealing sleeve 9 slide downward along the outer wall of the central tube 3 under the action of gravity until the lower cone 12 abuts against the upper end of the locking claw 16. In this process, the slip member 14 is withdrawn into the slip sleeve 13 due to the disappearance of the extrusion of the upper cone 11 and the lower cone 12, so as to be separated from the inner wall of the sleeve, and the sealing sleeve 9 also loses the extrusion limiting of the tooth ring pressure sleeve 8 and the sealing sleeve seat 10. Since it is made of soft metal material, the sealing part 93 will be extruded and worn by the inner wall of the sleeve with the continuous lifting of the optical tube 1, so as to realize unsealing and recovery of the packer.

[0041] In the embodiment, a limiting pin 19 is arranged on the intermediate sleeve 15 and is located between the unsealing pin 18 and the second fixing pin 21 in the axial direction of the optical tube 1. The limiting pin 19 abuts against the unsealing block 17 and limits the unsealing block 17 to prevent it from separating downward from the intermediate sleeve 15 in the axial direction of the optical tube 1. The shearing force of the limiting pin 19 is greater than that of the unsealing pin 18.

[0042] In the embodiment, a head variable buckle 30 is arranged at the upper end of the optical tube 1, and a compression sleeve 23 is sleeved on the optical tube 1 and is embedded in the main body sleeve 2 and is threadedly connected with the main body sleeve 2. The compression sleeve 23 is located between the head variable buckle 30 and the central tube 3 in the axial direction of the optical tube 1. The optical tube 1 and the main body sleeve 2 are sealed by a metal C-shaped ring, and the metal C-shaped ring is located between the compression sleeve 23 and the central tube 3.

[0043] In summary, the working principle of the present application is as follows:

[0044] Setting: the pressure oil is injected into the stepped hole cavity through the pressure oil hole 28, so that the piston member 4 drives the piston connecting sleeve 5 and the gear ring pressing sleeve 8 to move downward synchronously, and in the process, the first fixed pin 26 is cut off; then, the sealing cylinder 9 drives the sealing cylinder seat 10 and the upper cone 11 to move downward synchronously, and the fourth fixed pin 24 and the fifth fixed pin 25 are cut off in turn; the slip member 14 is unfolded from the slip sleeve 13 under the extrusion of the upper cone 11 and the lower cone 12 and abuts to the inner wall of the casing to realize the fixation of the thermal recovery packer in the casing; finally, with the further downward movement of the piston member 4, the gear ring pressing sleeve 8 extrudes the sealing cylinder 9 in cooperation with the sealing cylinder seat 10 to deform and tightly adhere to the inner wall of the casing, thereby realizing setting.

[0045] Heating: after setting, heating is injected, the smooth pipe 1 expands under heating, axially elongates, and the second fixed pin 21 is cut off, so that the smooth pipe 1 can freely slide in the central pipe 3.

[0046] Unsetting: the smooth pipe 1 is lifted, the tail variable buckle 29 installed at the lower end of the smooth pipe 1 moves upward to drive the unsetting block 17, the unsetting pin 18 is cut off, the smooth pipe 1 is continuously lifted, the unsetting block 17 continuously moves upward and is separated from the claw hook part of the lock claw 16, at this time, the claw hook part is separated from the intermediate sleeve 15, the intermediate sleeve 15, the lower cone 12, the slip sleeve 13, the slip member 14, the upper cone 11, the sealing cylinder seat 10 and the sealing cylinder 9 slide downward along the outer wall of the central pipe 3 under the action of gravity until the lower cone 12 abuts to the upper end of the lock claw 16. In this process, the slip member 14 is retracted into the slip sleeve 13 due to the disappearance of the extrusion of the upper cone 11 and the lower cone 12, thereby being separated from the inner wall of the casing, and the sealing cylinder 9 also loses the extrusion limiting of the gear ring pressing sleeve 8 and the sealing cylinder seat 10, with the continuous lifting of the smooth pipe 1, the sealing part 93 will be extruded and worn by the inner wall of the casing, thereby realizing unsetting and recycling of the packer.

[0047] The technical means disclosed in the present application scheme is not limited to the technical means disclosed in the above embodiments, and also includes technical solutions composed of any combination of the above technical features. It should be noted that for ordinary skilled persons in the art, without departing from the principle of the present application, some improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present application.

Claims

1. A thermal recovery packer, comprising: The heat production packer comprises: a light pipe (1); a main cylinder (2) sleeved outside the light pipe (1) and arranged close to the upper end of the light pipe (1); an intermediate sleeve (15) sleeved outside the light pipe (1) and arranged close to the lower end of the light pipe (1); a central pipe (3) sleeved outside the light pipe (1) and arranged between the main cylinder (2) and the intermediate sleeve (15), one end of the central pipe (3) being connected to the main cylinder (2) and the other end being connected to the intermediate sleeve (15); a tooth ring pressing sleeve (8) sleeved outside the central pipe (3); a sealing cylinder seat (10) sleeved outside the central pipe (3) and abutting against the intermediate sleeve (15); a sealing cylinder (9) sleeved outside the central pipe (3) and arranged between the tooth ring pressing sleeve (8) and the sealing cylinder seat (10), one end of the sealing cylinder (9) abutting against the tooth ring pressing sleeve (8) and the other end abutting against the sealing cylinder seat (10), the sealing cylinder (9) being made of soft metal material, both ends of the sealing cylinder (9) being provided with tapered cavities (91), the tooth ring pressing sleeve (8) and the sealing cylinder seat (10) being provided with tapered protrusions close to one end of the sealing cylinder (9), the tooth ring pressing sleeve (8) and the sealing cylinder seat (10) being embedded in the adjacent tapered cavities (91), the tapered protrusions being matched with the tapered cavities (91), a deformation groove (92) being annularly arranged on the outer wall of the sealing cylinder (9) and located in the region of the tapered cavities (91) in the axial direction of the sealing cylinder (9), the region of the sealing cylinder (9) located in the region of the tapered cavities (91) being rapidly expanded and deformed outward along the radial direction of the central pipe (3) as the tapered protrusions continuously extend into the tapered cavities (91); a driving member arranged between the main cylinder (2) and the central pipe (3) and used for driving the tooth ring pressing sleeve (8) to move towards the sealing cylinder seat (10) to press the sealing cylinder (9).

2. The thermal recovery packer of claim 1, wherein, The heat production packer further comprises an upper cone (11) and a lower cone (12) sleeved outside the central pipe (3), and a slip member (14) being 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 member (14) and the central pipe (3); the upper cone (11) is connected to the sealing cylinder seat (10) and the lower cone (12) is connected to the intermediate sleeve (15).

3. The thermal recovery packer of claim 1, wherein, The main cylinder (2) is provided with a stepped hole close to one end of the intermediate sleeve (15), and a large hole section of the stepped hole is arranged close to the intermediate sleeve (15); the central pipe (3) is threadedly connected to the inner wall of a small hole section of the stepped hole; the driving member is arranged in the large hole section.

4. The thermal recovery packer of claim 3, wherein, The driving member comprises a piston member (4) and a piston connecting sleeve (5), one end of the piston connecting sleeve (5) being embedded in the large hole section and abutting against the piston member (4), the other end of the piston connecting sleeve (5) being connected to the tooth ring pressing sleeve (8); the piston connecting sleeve (5) and the main cylinder (2) are connected by a first fixed pin (26). The piston member (4) is sealingly attached to the inner wall of the large hole section and the outer wall of the center tube (3); A pressure oil hole (28) is formed on the main body cylinder (2) and communicates with the large hole section, which is used to inject pressure oil into the large hole section to drive the piston member (4) to move towards the intermediate sleeve (15).

5. The thermal recovery packer of claim 4, wherein, The center tube (3) is provided with a ratchet on the outer wall, and the center tube (3) is provided with a ratchet ring (7) matched with the ratchet, one end of the ratchet ring (7) abuts to the piston connecting sleeve (5), and the other end abuts to the tooth ring pressing sleeve (8); The ratchet is inclined towards the side of the intermediate sleeve (15).

6. The thermal recovery packer according to any one of claims 1-5, wherein, The intermediate sleeve (15) is embedded with a locking claw (16), and the locking claw (16) is sleeved on the outer wall of the light pipe (1); The light pipe (1) is slidably sleeved with an unblocking block (17), which is connected to the intermediate sleeve (15) through an unblocking pin (18), and is connected to the light pipe (1) through a second fixed pin (21); The unblocking block (17) is located in 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 intermediate sleeve (15); The upper end of the locking claw (16) is connected to the center tube (3); The shearing force of the unblocking pin (18) is greater than that of the second fixed pin (21).

7. The thermal recovery packer of claim 6, wherein, The lower end of the light pipe (1) is provided with a tail variable buckle (29) and a shearing ring (27), and the shearing ring (27) is arranged close to the side of the upper end of the light pipe (1); The unblocking block (17) is connected to the shearing ring (27) through the second fixed pin (21).

8. The thermal recovery packer of claim 7, wherein, The intermediate sleeve (15) is provided with a limiting pin (19) which is located between the unblocking pin (18) and the second fixed pin (21) in the axial direction of the light pipe (1); The limiting pin (19) abuts to the unblocking block (17), which is used to limit the unblocking block (17) to prevent it from being separated from the intermediate sleeve (15) in the axial direction of the light pipe (1); The shearing force of the limiting pin (19) is greater than that of the unblocking pin (18).

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