Horizontal well thermal recovery steam injection packer

Abstract

The present invention relates to the technical field of packers, and in particular to steam injection packers for thermal recovery of horizontal wells. It comprises an inner tube, the upper side of the inner tube is provided with a joint mechanism for connecting with the outside world; an upper shell body, the upper shell body is provided on the inner tube through the joint mechanism; an upper pressure cap and a lower retaining cap, the upper pressure cap and the lower retaining cap are respectively slidably connected to the upper and lower sides of the upper shell body; a polytetrafluoroethylene seal, the polytetrafluoroethylene seal is provided in the middle of the upper shell body. The present invention changes the degree of deformation of the polytetrafluoroethylene seal caused by being squeezed by changing the distance between the lower retaining cap and the upper pressure cap, so that the sealing force of the polytetrafluoroethylene seal matches the downhole pressure, avoiding the conventional unchanged sealing force causing the polytetrafluoroethylene seal to be in a highly deformed state for a long time, and the existence of over-sealing (excessive deformation), thereby increasing the stress change of the polytetrafluoroethylene seal and reducing the service life of the polytetrafluoroethylene seal.

Description

Technical Field

[0001] The invention relates to the technical field of packers, in particular to a horizontal well thermal recovery steam injection packer. Background Art

[0002] A packer is a device used in oil wells. Its purpose is to isolate the relationship between the underground and the external environment. Packers are often used in the production of heavy oil. When heavy oil is produced, in order to improve the fluidity of crude oil and facilitate production and subsequent processing, steam is usually injected into the oil well to dilute the crude oil, reduce its viscosity and improve its fluidity. The packer relies on the expansion of the seal to fit closely with the rock wall to isolate the steam injection area from the oil layer recovery area, thereby ensuring the steam injection path and preventing steam overflow, thereby improving the steam injection efficiency and reducing energy consumption.

[0003] Existing packer designs usually allow the seal to expand evenly underground to achieve a sealing effect. However, pressure conditions in different underground wells are not always uniform, which means that in order to ensure effective sealing under any circumstances, the seal often needs to be designed to expand under the maximum expected pressure. Although this over-expansion can provide a reliable seal under high-pressure conditions, it will also cause greater stress inside the seal. When the seal is in an over-expanded state, its material will experience significant stretching and deformation, which will not only reduce the service life of the seal, but may also cause it to be more easily damaged after repeated use. Once the seal is damaged, it will affect the normal steam injection process, and then affect the effect and efficiency of the thermal recovery operation. In short, because the seal of the existing packer may be in an over-expanded state for a long time, it may accelerate aging and damage, thereby shortening the number of cycles of the seal and increasing the risk of failure in actual operation. Summary of the invention

[0004] In order to overcome the shortcomings mentioned in the above technical background, the object of the present invention is to provide a horizontal well thermal production steam injection packer.

[0005] The technical solution of the present invention is: a horizontal well thermal recovery steam injection packer comprises an inner tube, and a joint mechanism for connecting with the outside is arranged on the upper side of the inner tube;

[0006] an upper shell, the upper shell being arranged on the inner tube through the joint mechanism;

[0007] An upper pressure cap and a lower stop cap, wherein the upper pressure cap and the lower stop cap are respectively slidably connected to the upper and lower sides of the upper shell;

[0008] A polytetrafluoroethylene seal, which is arranged in the middle of the upper shell, and is located between the upper pressure cap and the lower stop cap, and both the upper pressure cap and the lower stop cap are extruded and matched with the polytetrafluoroethylene seal;

[0009] A connecting mechanism, the connecting mechanism is arranged on the upper shell, and the connecting mechanism is used to squeeze the lower stop cap;

[0010] The regulating mechanism is arranged on a side of the connecting mechanism away from the inner tube, and is used to adjust the pressure in the inner tube.

[0011] As an improvement of the above solution, the joint mechanism includes:

[0012] An upper joint, an extrusion, a sealing transition joint and a graphite seal, wherein the upper joint, the extrusion, the sealing transition joint and the graphite seal are all arranged on the upper part of the inner tube, the extrusion is extruded and matched with the graphite seal, the extrusion is slidably connected with the sealing transition joint, and the sealing transition joint wraps the graphite seal;

[0013] An outer tube is fixedly connected to a side of the sealing transition joint away from the extrusion piece.

[0014] As an improvement of the above solution, the connecting mechanism includes:

[0015] A piston, the piston being slidably connected to a side of the upper housing away from the upper joint;

[0016] An intermediate transition joint, the intermediate transition joint is fixedly connected to the upper housing, the piston is slidably connected to the intermediate transition joint, and the piston is extrusion-fitted with the lower stop cap;

[0017] A sealing connection joint, wherein the sealing connection joint is fixedly connected to a side of the intermediate transition joint away from the piston;

[0018] A central tube, the central tube being fixedly connected to a side of the sealing connection joint away from the intermediate transition joint;

[0019] A ball socket joint is fixedly connected to a side of the central pipe away from the sealing connection joint.

[0020] As an improvement of the above solution, the adjustment mechanism includes:

[0021] A sealing ring, the sealing ring is slidably connected to the central tube, and the sealing ring is in contact with the sealing connection joint;

[0022] A retaining ring, wherein the retaining ring is fixedly connected to a side of the center tube away from the sealing ring, a first elastic element is arranged between the sealing ring and the retaining ring, the first elastic element is used to provide pressure for the sealing ring, an annular cavity is arranged between the sealing connection joint, the center tube and the sealing ring, a first hole is arranged on a side of the center tube close to the sealing connection joint, the first hole is communicated with the annular cavity, and a second hole is arranged on a side of the upper shell close to the intermediate transition joint.

[0023] As an improvement of the above scheme, it also includes:

[0024] a torque transmission joint, the torque transmission joint being slidably connected in the outer tube and fixedly connected to the inner tube;

[0025] A push-down cap is fixedly connected to a side of the outer tube away from the sealing transition joint, and a plurality of limiting protrusions are arranged on the side where the sealing transition joint, the torque transfer joint and the push-down cap are close to each other, and the limiting protrusions on different parts are staggered and mutually limited.

[0026] As an improvement of the above scheme, it also includes:

[0027] A thermosensitive sheet is arranged in the middle of the upper shell, and the thermosensitive sheet is used to extrude the polytetrafluoroethylene seal. The upper shell is provided with more than one group of third holes, and the third holes are connected to the thermosensitive sheet. The upper shell is provided with more than one fourth hole.

[0028] As an improvement of the above scheme, it also includes:

[0029] There are multiple blocking columns, and the multiple blocking columns are all fixed to the side of the thermal sensitive sheet close to the upper shell. The number of blocking columns is the same as the number of the third holes, and the blocking columns are matched with the adjacent third holes for blocking.

[0030] As an improvement of the above solution, a plurality of fifth holes are provided on the thermal sheet for heating the polytetrafluoroethylene sealing member.

[0031] As an improvement of the above scheme, it also includes:

[0032] A deflection mechanism, the deflection mechanism is arranged on a side of the upper housing close to the torque transmission joint, and the deflection mechanism is used to make the thermal sheet and the polytetrafluoroethylene seal rotate relative to each other;

[0033] The deflection mechanism comprises a limiting ring, the limiting ring is fixedly connected to a side of the upper shell body close to the torque transmission joint, the thermal sheet is rotatably connected to the upper shell body, and the limiting ring is provided with limiting blocks in an annular array;

[0034] A heat conducting member, wherein the heat conducting member is fixedly connected to a side of the upper shell body close to the torque transmission joint, a side of the thermal sensitive sheet close to the limiting ring is fixedly connected to a second elastic element of an annular array, and the second elastic element is limitedly matched with an adjacent limiting block on the limiting ring;

[0035] The thermosensitive component is fixedly connected to a side of the heat-conducting component close to the thermosensitive sheet, and the thermosensitive component is limitedly pressed and matched with the adjacent second elastic element.

[0036] As an improvement of the above solution, the deformation displacement of the thermosensitive element is arc-shaped, and the displacement of a single deformation of the thermosensitive element is equal to the distance between adjacent second elastic elements. The side of the thermosensitive element away from the adjacent heat-conducting element is arc-shaped for smoothly passing through the adjacent second elastic element.

[0037] Compared with the prior art, the present invention has at least the following beneficial effects: the present invention changes the distance between the lower retaining cap and the upper pressure cap, thereby changing the degree of deformation caused by the extrusion of the polytetrafluoroethylene seal, so that the sealing force of the polytetrafluoroethylene seal matches the downhole pressure, avoiding the conventional unchanged sealing force causing the polytetrafluoroethylene seal to be in a highly deformed state for a long time, resulting in over-sealing (excessive deformation), thereby increasing the stress change of the polytetrafluoroethylene seal and reducing the service life of the polytetrafluoroethylene seal; when the heat-sensitive sheet is deformed by heat, the spiral protrusion area on it squeezes the adjacent area of ​​the polytetrafluoroethylene seal, so that the polytetrafluoroethylene seal is subjected to radial spiral extrusion force and undergoes further local deformation, so that the contact area between the polytetrafluoroethylene seal and the rock wall is refined into multiple parts that strengthen the contact extrusion force, which is equivalent to making a multi-layer seal, thereby Improve the sealing effect; gradually insert the plugging column into the adjacent third hole and squeeze out the debris in the adjacent third hole to prevent the third hole from being blocked by foreign matter, thereby affecting the normal contact between steam and the thermal sensitive sheet; use the lifting (lowering) inner tube to make the limiting protrusion on the torque transmission joint and the limiting protrusion on the sealing transition joint (the limiting protrusion on the lower pressure cap) engage and transmit torque, thereby performing rotational activity to release the jam, and avoid damage caused by pulling hard when the packer is stuck; the thermal sensitive sheet and the upper shell are driven to rotate relative to each other by the second elastic element, and the contact position between the spiral protrusion area on the thermal sensitive sheet and the polytetrafluoroethylene seal is changed, so as to uniformly squeeze various areas on the polytetrafluoroethylene seal to prevent the local area on the polytetrafluoroethylene seal from being repeatedly squeezed for a long time, so that it is strained too many times, resulting in failure of the polytetrafluoroethylene seal and affecting normal sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0039] Figure 2 It is a three-dimensional structural cross-sectional view of the inner tube and its upper parts of the present invention;

[0040] Figure 3 It is a three-dimensional structural cross-sectional view of the upper shell and its upper parts of the present invention;

[0041] Figure 4 It is a three-dimensional structural cross-sectional view of the upper shell and its upper parts of the present invention;

[0042] Figure 5 It is a three-dimensional structural exploded diagram of the upper shell and its upper parts of the present invention;

[0043] Figure 6 It is a schematic diagram of the three-dimensional structure of the polytetrafluoroethylene seal of the present invention when it is extruded;

[0044] Figure 7 It is a schematic diagram of the three-dimensional structure when the thermal sensitive sheet and the upper shell of the present invention rotate relative to each other;

[0045] Figure 8 For the present invention Figure 6 A magnified view of the three-dimensional structure at center A;

[0046] Fig. 9 It is a three-dimensional structural exploded view of the thermal sensitive sheet and the parts thereon of the present invention.

[0047] Names of the numbers in the figure: 1. inner tube, 2. upper joint, 3. extrusion, 4. sealing transition joint, 5. graphite seal, 6. outer tube, 7. upper shell, 8. upper pressure cap, 9. lower stop cap, 10. polytetrafluoroethylene seal, 11. piston, 12. intermediate transition joint, 13. sealing connection joint, 14. center tube, 15. ball seat joint, 16. torque transmission joint, 17. lower pressure cap, 1801. sealing ring, 1802. stop ring, 1803. first elastic element, 1804. annular cavity, 1805. first hole, 1806. second hole, 19. thermal sensitive sheet, 20. third hole, 21. fourth hole, 22. blocking column, 23. fifth hole, 2401. limiting ring, 2402. heat conductive member, 2403. second elastic element, 2404. thermal sensitive member. DETAILED DESCRIPTION

[0048] The above scheme is further described below in conjunction with specific examples. It should be understood that these examples are used to illustrate the present application and are not limited to the scope of the present application. The implementation conditions adopted in the examples can be further adjusted according to the conditions of the specific manufacturer, and the unspecified implementation conditions are usually the conditions in conventional experiments.

[0049] Most of the existing packers only expand the seals to the same extent, but the downhole pressures are not the same. Therefore, the existing packers can only make the seals over-expand to achieve the sealing purpose. The internal stress changes of the over-expanded seals are also huge, which greatly reduces the number of cycles of the seals and makes the seals prone to damage during use, thereby affecting the normal steam injection process.

[0050] Example 1: Horizontal well thermal recovery steam injection packer, such as Figure 1-Figure 5 As shown, it includes an inner tube 1, and a joint mechanism for connecting to the outside world is arranged on the upper side of the inner tube 1. The joint mechanism includes an upper joint 2, an extrusion 3, a sealing transition joint 4 and a graphite seal 5. The upper joint 2, the extrusion 3, the sealing transition joint 4 and the graphite seal 5 are all arranged on the upper part of the inner tube 1. The extrusion 3 is extruded and matched with the graphite seal 5. The extrusion 3 is slidably connected with the sealing transition joint 4. The upper joint 2 is used to connect with the external pipe column, and is used to control the take-off and landing of the present invention, so as to transfer the present invention to the target area. 2 can also be connected to an external steam pipe for injecting steam into the well. The sealing transition joint 4 wraps the graphite seal 5 for sealing the sealing transition joint 4 and the inner pipe 1. The lower side of the sealing transition joint 4 is threadedly connected to the outer pipe 6. The lower side of the outer pipe 6 is threadedly connected to the upper shell 7. The upper and lower sides of the outer side of the upper shell 7 are respectively slidably connected with an upper pressure cap 8 and a lower stop cap 9. A polytetrafluoroethylene seal 10 is sleeved in the middle of the outer side of the upper shell 7. The polytetrafluoroethylene seal 10 is located between the upper pressure cap 8 and the lower stop cap 9, and the upper pressure cap 8 and the lower stop cap 9 are both The lower stop cap 9 is moved upward to extrude the polytetrafluoroethylene seal 10, so that the polytetrafluoroethylene seal 10 is deformed and expanded, thereby fitting closely with the rock wall to play a sealing role, thereby preventing steam from overflowing. The lower side of the upper shell 7 is provided with a connecting mechanism for extruding the lower stop cap 9, and the connecting mechanism includes a piston 11 that is extruded and matched with the lower stop cap 9. The piston 11 is slidably connected to the lower part of the outer side of the upper shell 7. The piston 11 moves upward to drive the lower stop cap 9 to move upward together, so that the lower stop cap 9 squeezes the polytetrafluoroethylene. The sealing member 10 has an intermediate transition joint 12 which is slidably connected to the piston 11 through a threaded connection at the lower portion of the outer side of the upper shell body 7. The intermediate transition joint 12 is located at the lower side of the piston 11. The lower side of the intermediate transition joint 12 is threadedly connected to a sealing connection joint 13. The lower side of the sealing connection joint 13 is threadedly connected to a center tube 14. The lower side of the center tube 14 is threadedly connected to a ball seat joint 15. The ball seat joint 15 is used to hold a sealing ball to isolate the packer from the outside. An adjusting mechanism for adjusting the internal pressure of the center tube 14 is provided on the outer side of the center tube 14.

[0051] like Figure 2 and Figure 5As shown, it also includes a torque transmission joint 16, which is slidably connected to the middle and lower part of the outer tube 6, and the torque transmission joint 16 is threadedly connected to the inner tube 1, and the lower part of the inner side of the outer tube 6 is threadedly connected with a push-down cap 17, and the lower side of the sealing transition joint 4, the upper and lower sides of the torque transmission joint 16 and the upper side of the push-down cap 17 are all provided with a plurality of limiting protrusions arranged in a ring array, and the limiting protrusions on different parts are staggered and mutually limited to cooperate, so as to even out the torque. When the drill is stuck, the present invention moves up (down) the pipe string, even if the inner tube 1 carries the torque transmission joint 16 to move upward (downward) together, until the torque transmission joint 16 moves upward (downward) to the point where its upper limit protrusion is in a limit cooperation state with the adjacent limiting protrusion on the sealing transition joint 4 (pull-down cap 17), and then the pipe string is rotated to make the torque transmission joint 16 drive the sealing transition joint 4 (pull-down cap 17) to rotate together, and then the packer is rotated as a whole, so as to release the jam.

[0052] like Figure 1-Figure 5 As shown, the adjustment mechanism includes a sealing ring 1801 that contacts and cooperates with the sealing connection joint 13, the sealing ring 1801 is slidably connected to the upper part of the outer side of the central tube 14, and the lower part of the outer side of the central tube 14 is threadedly connected with a retaining ring 1802, and a first elastic element 1803 is arranged between the sealing ring 1801 and the retaining ring 1802. The first elastic element 1803 is a spring, and the first elastic element 1803 is initially in a compressed state. The first elastic element 1803 in a compressed state is used to provide pressure for the sealing ring 1801, and the retaining ring 1802 is rotated to move up and down along the central tube 14, so as to change the distance between it and the sealing ring 1801, and change the compression amount of the first elastic element 1803, thereby changing the contact between the sealing ring 1801 and the sealing connection joint 13. Touch pressure, so that the steam injection pressure in the center tube 14 matches the external crude oil pressure, thereby extending the service life of the polytetrafluoroethylene seal 10 while ensuring its effective sealing. An annular cavity 1804 is arranged between the sealing connection joint 13, the center tube 14 and the sealing ring 1801, and a first hole 1805 connected to the annular cavity 1804 is arranged at the upper part of the right side of the center tube 14, and a second hole 1806 is arranged at the lower part of the right side of the upper shell 7. After the steam passes through the second hole 1806, it squeezes the piston 11 (the squeezing force is the elastic force generated after the first elastic element 1803 is compressed), and then the piston 11 drives the lower stop cap 9 to move upward together, and the lower stop cap 9 squeezes the polytetrafluoroethylene seal 10, and the polytetrafluoroethylene seal 10 deforms and expands and fits tightly with the rock wall, thereby playing a sealing role.

[0053] When steam is injected, the steam will enter the annular cavity 1804 from the first hole 1805, and then the steam will enter the casing from the annular cavity 1804, and finally the steam will enter the bottom layer to contact the crude oil, so as to heat and dilute the viscous crude oil, thereby increasing the fluidity of the crude oil and further increasing the output of the crude oil. In the process of steam coming out of the annular cavity 1804, the sealing ring 1801 will be tightly attached to the sealing connection joint 13 under the action of the elastic force of the first elastic element 1803 and form a certain sealing pressure. When the steam rushes out of the annular cavity 1804, a certain shut-off pressure will be formed. At this time, the steam pressure in the upper shell 7 will rise, and then the steam with increased pressure will push the piston 11 upward after passing through the second hole 1806, that is, the shut-off pressure is increased. The flow pressure acts on the piston 11, and the piston 11 pushes the lower stop cap 9 upward and squeezes the polytetrafluoroethylene seal 10. Then the polytetrafluoroethylene seal 10 is compressed and begins to expand. The expanded polytetrafluoroethylene seal 10 finally fits tightly against the rock wall and forms a seal to prevent steam from overflowing. Since the downhole pressure is not the same, the sealing strength formed by the expansion of the polytetrafluoroethylene seal 10 is also different. This prevents the conventional unchanged sealing strength from causing the polytetrafluoroethylene seal 10 to be in a highly deformed state for a long time, resulting in excessive sealing (excessive deformation). This increases the stress change of the polytetrafluoroethylene seal 10, reduces the service life of the polytetrafluoroethylene seal 10, and is prone to damage, affecting the normal progress of thermal recovery.

[0054] After the steam injection work is completed, the inner tube 1 moves upward, and the inner tube 1 drives the torque transfer joint 16 to move upward together. When the torque transfer joint 16 moves upward to the point where its upper limit protrusion cooperates with the adjacent limit protrusion on the sealing transition joint 4, the torque transfer joint 16 drives the sealing transition joint 4 and the parts thereon to move upward together (i.e., the device is removed). During the downward (upward) movement of the device, if the device is stuck in the drill (stuck in the rock wall), the inner tube 1 can be lifted (lowered) to make the limit protrusion on the torque transfer joint 16 engage with the limit protrusion on the sealing transition joint 4 (the limit protrusion on the lower pressure cap 17) and transmit torque, thereby performing a rotational activity to release the jam, thereby avoiding damage caused by pulling hard when the packer is stuck.

[0055] Embodiment 2: Based on embodiment 1, Figure 2-Figure 7As shown, it also includes a thermal sheet 19 for extruding the polytetrafluoroethylene seal 10. The thermal sheet 19 is arranged in the upper middle part of the outer side of the upper shell 7. The thermal sheet 19 is a spiral wave tube (that is, there is a threaded wave convex area), and the convex area of ​​the thermal sheet 19 is in contact with the adjacent area of ​​the polytetrafluoroethylene seal 10. The thermal sheet 19 expands after being heated and is used to extrude the polytetrafluoroethylene seal 10, so that the polytetrafluoroethylene seal 10 is squeezed by the lower baffle 9 and then squeezed by the spiral convexity on the thermal sheet 19. In this way, the contact area between the polytetrafluoroethylene seal 10 and the rock wall is subdivided into multiple areas, thereby realizing multi-layer sealing, thereby improving the sealing effect. The upper shell 7 is provided with two groups of third holes 20 arranged in upper and lower mirror images, each group containing a plurality of third holes 20 in an annular array, and the third holes 20 are connected to the thermal sheet 19. The upper shell 7 is provided with two fourth holes 21 arranged in upper and lower mirror images.

[0056] like Figure 6 and Figure 7 As shown, it also includes a blocking column 22, and there are several blocking columns 22. The blocking columns 22 are all fixed to the inner side of the thermal sheet 19. The number of the blocking columns 22 is the same as that of the third holes 20 (two groups arranged in upper and lower mirror images, each group containing several blocking columns 22 in a circular array). The blocking columns 22 cooperate with the adjacent third holes 20 for blocking. The blocking columns 22 are separated from and inserted into the adjacent third holes 20 before and after steam injection to squeeze out impurities in the adjacent third holes 20, thereby ensuring the fluidity of the third holes 20 and ensuring that the steam can smoothly contact the thermal sheet 19. The non-raised area on the thermal sheet 19 is provided with several fifth holes 23 evenly distributed in a spiral shape, which are used to uniformly heat the polytetrafluoroethylene seal 10 to slightly soften the polytetrafluoroethylene seal 10, increase the contact area between it and the rock wall, and thereby improve the sealing effect.

[0057] like Figure 6-Figure 9As shown, it also includes a deflection mechanism for making the thermal sheet 19 and the polytetrafluoroethylene seal 10 rotate relative to each other. The deflection mechanism is arranged on the upper side of the upper shell 7. The deflection mechanism includes a limit ring 2401. The limit ring 2401 is fixedly connected to the upper part of the upper shell 7. The thermal sheet 19 is rotatably connected to the upper shell 7. The limit ring 2401 is provided with a plurality of limit blocks in an annular array. The limit blocks are triangular-shaped, and the outer side of the limit blocks is gradually deflected outward in a counterclockwise direction (in a top view). The plurality of limit blocks are connected in sequence. Four heat conducting members 2402 in an annular array are fixedly connected to the upper side of the upper shell 7. The upper part of the inner side of the sensitive sheet 19 is fixedly connected with a plurality of second elastic elements 2403 in an annular array. The second elastic element 2403 is a spring plate, which is used to pass through the adjacent limiting block on the limiting ring 2401 in one direction. The second elastic element 2403 is limitedly matched with the adjacent limiting block on the limiting ring 2401. The adjacent second elastic element 2403 is squeezed by the adjacent limiting block on the limiting ring 2401, so that the second elastic element 2403 is elastically deformed. The back sides of the four heat-conducting members 2402 are fixedly connected with a heat-sensitive member 2404. The heat-sensitive member 2404 is spiral and is used to extend the water The thermosensitive element 2404 is limited and squeezed with the adjacent second elastic element 2403. The thermosensitive element 2404 is limited and squeezed on the adjacent second elastic element 2403, so that the second elastic element 2403 drives the thermosensitive sheet 19 to move. After the second elastic element 2403 moves through the adjacent limit block on the limit ring 2401, it is blocked by the limit block (to prevent reset). The deformation displacement of the thermosensitive element 2404 is arc-shaped, and the displacement of the thermosensitive element 2404 in a single deformation is equal to the distance between the adjacent second elastic element 2403 and the adjacent third hole 20 on the same horizontal plane. The distances between them are all equal, and the back sides of the four thermistors 2404 are all arc-shaped, which are used to smoothly pass through the adjacent second elastic elements 2403. During the process of the thermistor 2404 losing heat and resetting, the arc-shaped area of ​​the thermistor 2404 contacts the adjacent second elastic element 2403. Since the second elastic element 2403 is limited by the adjacent limit block on the limit ring 2401 and cannot be reset, the thermistor 2404 is deformed under the action of the squeezing of the adjacent second elastic element 2403 until the thermistor 2404 is reset and passes through the adjacent second elastic element 2403 to return to its original state.

[0058] After the steam enters the upper shell 7, the steam contacts the thermal sheet 19 after passing through the adjacent fourth hole 21. Subsequently, the thermal sheet 19 is heated and radially deformed (its spiral protrusion area begins to expand), and the adjacent area of ​​the polytetrafluoroethylene seal 10 is squeezed, so that the polytetrafluoroethylene seal 10 is further subjected to radial spiral extrusion force and undergoes further local deformation. In this way, the contact area between the polytetrafluoroethylene seal 10 and the rock wall is refined into multiple parts that enhance the contact extrusion force, which is equivalent to multi-layer sealing, thereby improving the sealing effect and preventing the single high-intensity extrusion of the traditional sealing method from reducing the service life of the polytetrafluoroethylene seal 10, thereby affecting the normal progress of thermal recovery work.

[0059] The steam between the upper shell 7 and the thermal sheet 19 also contacts the polytetrafluoroethylene seal 10 through the adjacent fifth hole 23, so that the polytetrafluoroethylene seal 10 is softened by heat, thereby increasing the deformation degree of the polytetrafluoroethylene seal 10, making the polytetrafluoroethylene seal 10 fully fit the rock wall, and then improving the sealing effect, preventing steam from overflowing during the steam injection process, thereby affecting the normal progress of thermal recovery. In the process of radial deformation of the thermal sheet 19, the thermal sheet 19 drives the blocking column 22 thereon to move together, and the blocking column 22 gradually loses the blocking of the adjacent third hole 20, so that the steam in the upper shell 7 passes through the adjacent third hole 20 and then contacts the thermal sheet 19 evenly, thereby making the thermal sheet 19 expand evenly. After the steam injection is completed, the temperature of the thermal sheet 19 gradually decreases and gradually returns to its original state. The blocking column 22 is then gradually inserted into the adjacent third hole 20, and the debris in the adjacent third hole 20 is squeezed out to prevent the third hole 20 from being blocked by foreign matter from the outside, thereby affecting the normal contact between the steam and the thermal sheet 19.

[0060] When the steam enters the upper shell 7, the steam contacts the heat-conducting member 2402, and the heat-conducting member 2402 transfers the heat to the adjacent thermosensitive member 2404. Then, the thermosensitive member 2404 is deformed, and one end of the four thermosensitive members 2404 away from the adjacent heat-conducting member 2402 begins to extend in the counterclockwise direction (in the top view). The thermosensitive member 2404 drives the adjacent second elastic element 2403 to rotate counterclockwise, and the second elastic element 2403 begins to slide along the adjacent limit block on the limit ring 2401. Under the extrusion of the limit block, the second elastic element 2403 is deformed until the second elastic element 2403 is deformed. After passing through the adjacent limit block on the limit ring 2401, the elastic element 2403 is reset under the action of its own elastic force. The four moving second elastic elements 2403 jointly drive the thermal sheet 19 to rotate counterclockwise. The thermal sheet 19 and the upper shell 7 rotate relative to each other. The spiral protrusion area on the thermal sheet 19 changes the contact area with the polytetrafluoroethylene seal 10, thereby uniformly squeezing each area on the polytetrafluoroethylene seal 10 to prevent the local area on the polytetrafluoroethylene seal 10 from being repeatedly squeezed for a long time, which causes it to be strained too many times, resulting in failure of the polytetrafluoroethylene seal 10 and affecting normal sealing.

[0061] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. Horizontal well thermal recovery steam injection packer, characterized in that: It comprises an inner tube (1), wherein the upper side of the inner tube (1) is provided with a joint mechanism for connecting with the outside world; An upper shell (7), the upper shell (7) being arranged on the inner tube (1) via the joint mechanism; An upper pressure cap (8) and a lower stop cap (9), wherein the upper pressure cap (8) and the lower stop cap (9) are slidably connected to upper and lower sides of the upper shell (7) respectively; A polytetrafluoroethylene seal (10), the polytetrafluoroethylene seal (10) being arranged in the middle of the upper shell (7), the polytetrafluoroethylene seal (10) being located between the upper pressure cap (8) and the lower stop cap (9), and the upper pressure cap (8) and the lower stop cap (9) being extrusion-fitted with the polytetrafluoroethylene seal (10); A connecting mechanism, the connecting mechanism being arranged on the upper shell (7), the connecting mechanism being used to press the lower stop cap (9); an adjusting mechanism, the adjusting mechanism being arranged on a side of the connecting mechanism away from the inner tube (1), the adjusting mechanism being used to adjust the pressure in the inner tube (1); The joint mechanism comprises: An upper joint (2), an extrusion (3), a sealing transition joint (4) and a graphite seal (5), wherein the upper joint (2), the extrusion (3), the sealing transition joint (4) and the graphite seal (5) are all arranged on the upper part of the inner tube (1), the extrusion (3) and the graphite seal (5) are extruded and matched with each other, the extrusion (3) and the sealing transition joint (4) are slidably connected, and the sealing transition joint (4) wraps the graphite seal (5); An outer tube (6), the outer tube (6) being fixedly connected to a side of the sealing transition joint (4) away from the extrusion piece (3); Also included are: a torque transmission joint (16), the torque transmission joint (16) being slidably connected inside the outer tube (6), and the torque transmission joint (16) being fixedly connected to the inner tube (1); A pressing cap (17), the pressing cap (17) being fixedly connected to a side of the outer tube (6) away from the sealing transition joint (4), and a plurality of limiting protrusions are arranged on a side where the sealing transition joint (4), the torque transmission joint (16) and the pressing cap (17) are close to each other, and the limiting protrusions on different parts are staggered and mutually limited; Also included are: a thermal sheet (19), the thermal sheet (19) being arranged in the middle of the upper shell (7), the thermal sheet (19) being used for extruding the polytetrafluoroethylene sealing element (10), the upper shell (7) being provided with more than one set of third holes (20), the third holes (20) being communicated with the thermal sheet (19), and the upper shell (7) being provided with more than one fourth hole (21); Also included are: A blocking column (22), wherein the blocking column (22) has a plurality of blocking columns (22), and the plurality of blocking columns (22) are all fixedly connected to a side of the thermal sheet (19) close to the upper shell (7), the number of the blocking columns (22) is the same as the number of the third holes (20), and the blocking columns (22) cooperate with adjacent third holes (20) to block each other; Also included are: a deflection mechanism, the deflection mechanism being arranged on a side of the upper housing (7) close to the torque transmission joint (16), the deflection mechanism being used to cause the thermal sheet (19) and the polytetrafluoroethylene sealing element (10) to rotate relative to each other; The deflection mechanism comprises: a limiting ring (2401), the limiting ring (2401) being fixedly connected to a side of the upper shell (7) close to the torque transmission joint (16), the thermal sheet (19) being rotatably connected to the upper shell (7), and the limiting ring (2401) being provided with limiting blocks in an annular array; a heat conducting member (2402), the heat conducting member (2402) being fixedly connected to a side of the upper shell (7) close to the torque transmission joint (16); a side of the thermal sensitive sheet (19) close to the limiting ring (2401) being fixedly connected to a second elastic element (2403) in an annular array; the second elastic element (2403) being in position-limiting cooperation with an adjacent limiting block on the limiting ring (2401); A thermosensitive component (2404), the thermosensitive component (2404) is fixedly connected to a side of the heat-conducting component (2402) close to the thermosensitive sheet (19), and the thermosensitive component (2404) is limitedly pressed and matched with the adjacent second elastic element (2403).

2. The horizontal well thermal recovery steam injection packer according to claim 1, characterized in that: The connecting mechanism comprises: A piston (11), the piston (11) being slidably connected to a side of the upper housing (7) away from the upper joint (2); An intermediate transition joint (12), the intermediate transition joint (12) being fixedly connected to the upper housing (7), the piston (11) and the intermediate transition joint (12) being slidably connected, and the piston (11) being extrusion-fitted with the lower stop cap (9); A sealed connection joint (13), the sealed connection joint (13) being fixedly connected to a side of the intermediate transition joint (12) away from the piston (11); A central tube (14), the central tube (14) being fixedly connected to a side of the sealing connection joint (13) away from the intermediate transition joint (12); A ball socket joint (15), the ball socket joint (15) being fixedly connected to a side of the central tube (14) away from the sealing connection joint (13).

3. The horizontal well thermal recovery steam injection packer according to claim 2, characterized in that: The regulating mechanism comprises: A sealing ring (1801), the sealing ring (1801) being slidably connected to the central tube (14), the sealing ring (1801) being in contact and fit with the sealing connection joint (13); A retaining ring (1802) is fixedly connected to a side of the central tube (14) away from the sealing ring (1801); a first elastic element (1803) is provided between the sealing ring (1801) and the retaining ring (1802); the first elastic element (1803) is used to provide pressure for the sealing ring (1801); an annular cavity (1804) is provided between the sealing connection joint (13), the central tube (14) and the sealing ring (1801); a first hole (1805) is provided on a side of the central tube (14) close to the sealing connection joint (13); the first hole (1805) is communicated with the annular cavity (1804); and a second hole (1806) is provided on a side of the upper shell (7) close to the intermediate transition joint (12).

4. The horizontal well thermal recovery steam injection packer according to claim 1, characterized in that: The heat-sensitive sheet (19) is provided with a plurality of fifth holes (23) for heating the polytetrafluoroethylene sealing element (10).

5. The horizontal well thermal recovery steam injection packer according to claim 1, characterized in that: The deformation displacement of the thermosensitive element (2404) is arc-shaped, and the displacement of a single deformation of the thermosensitive element (2404) is equal to the distance between the adjacent second elastic elements (2403). The side of the thermosensitive element (2404) away from the adjacent heat-conducting element (2402) is arc-shaped, so as to smoothly pass through the adjacent second elastic element (2403).

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