A tee pipe hanger and gas storage system

Abstract

The present application relates to oil and gas well completion technical field, especially a kind of ball seat tail pipe hanger and gas storage system, to solve the risk brought by drilling blind plate.The ball seat tail pipe hanger provided by the present application includes center tube, setting and pressure holding mechanism and sealing mechanism;One end of the center tube is connected with the setting and pressure holding mechanism, and the center tube and the setting and pressure holding mechanism are inserted into the sealing mechanism;The setting and pressure holding mechanism includes hinged sleeve, hinged shaft, ball seat and setting ball, and the hinged sleeve is connected with the center tube;One end of the hinged shaft is connected with the ball seat, and the other end is inserted into the hinged sleeve and rotatably connected with the hinged sleeve, and is configured to be able to rotate around the axis of the center tube;Setting ball is sequentially through center tube, hinged sleeve, hinged shaft and seat into ball seat when setting.The ball seat tail pipe hanger provided by the present application integrates ball seat into hanger running tool, and the ball seat can be taken out of wellbore after the hanger is set, to avoid drilling blind plate.

Description

Technical Field

[0001] This invention relates to the field of oil and gas well completion technology, and in particular to a ball seat tailpipe hanger and gas storage system. Background Technology

[0002] In gas storage and geothermal well completions, suspended screen pipe completions are commonly used to reduce costs. Most commonly used hangers place the ball seat at the bottom of the well, but this method of placing the ball seat at the bottom of the well with a suspended screen pipe cannot achieve proper pressure setting. Using blind flanges for pressure setting would introduce risks and increased construction costs associated with drilling and removing the blind flanges later. Summary of the Invention

[0003] The purpose of this invention is to provide a ball seat tailpipe hanger and an air storage system to solve the risks associated with drilling and removing blind plates.

[0004] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows:

[0005] A ball seat tailpipe hanger includes a central tube, a seat-hanging and pressing mechanism, and a sealing mechanism; one end of the central tube is connected to the seat-hanging and pressing mechanism, and the central tube and the seat-hanging and pressing mechanism are inserted into the sealing mechanism;

[0006] The seat-hanging pressure mechanism includes a hinge sleeve, a hinge shaft, a ball seat, and a seat sealing ball. The hinge sleeve is connected to the central tube. One end of the hinge shaft is connected to the ball seat, and the other end is inserted into the hinge sleeve and rotatably connected to the hinge sleeve, configured to rotate around the axis of the central tube.

[0007] During the mounting process, the seated ball passes sequentially through the central tube, the hinge sleeve, and the hinge shaft before being seated in the ball seat.

[0008] Furthermore, the central tube has liquid passage holes on its side wall.

[0009] Furthermore, the sealing mechanism includes a connecting sleeve and a combined sealing assembly;

[0010] The combined sealing assembly is sleeved on the connecting sleeve, and the central tube is inserted into the connecting sleeve; the combined sealing assembly includes a first protective ring, a first rubber sleeve, a metal sealing body, a second rubber sleeve, and a second protective ring, which are sequentially sleeved along the axial direction of the connecting sleeve.

[0011] One end of the first rubber tube is inserted into the first protective ring, and the other end is inserted into the metal sealing body; one end of the second rubber tube is inserted into the second protective ring, and the other end is inserted into the metal sealing body;

[0012] The first protective ring and the second protective ring are configured to approach each other to push the metal sealing body and squeeze the first rubber tube and the second rubber tube, thereby causing the first rubber tube and the second rubber tube to expand.

[0013] Furthermore, the combined sealing assembly also includes a first seal and a second seal;

[0014] The outer wall of the metal sealing body is provided with a first mounting groove, and the inner wall is provided with a second mounting groove; the first sealing element is fitted onto the metal sealing body and installed in the first mounting groove; the second sealing element is inserted into the metal sealing body and installed in the second mounting groove, and the second sealing element is fitted onto the connecting sleeve.

[0015] Furthermore, the metal sealing body includes a first wing-shaped sealing ring, a main sealing ring, and a second wing-shaped sealing ring arranged sequentially along the axial direction of the connecting sleeve;

[0016] The first rubber sleeve is inserted into the first wing-shaped sealing ring, and the second rubber sleeve is inserted into the second wing-shaped sealing ring;

[0017] When the first rubber tube is squeezed and expanded by the first protective ring and the main sealing ring, the first rubber tube pushes the first wing-shaped sealing ring to flip over;

[0018] When the second rubber tube is squeezed and expanded by the second protective ring and the main sealing ring, the second rubber tube pushes the second wing-shaped sealing ring to flip over.

[0019] Furthermore, the sealing mechanism also includes a seat cone sleeve, a slip assembly, a movable sleeve, and a drive assembly, which are sequentially fitted onto the central tube;

[0020] The seat-mounted cone sleeve is connected to the connecting sleeve and inserted into the slip assembly. The drive assembly is used to push the movable sleeve. The movable sleeve pushes the slip in the slip assembly to move along the axial direction of the seat-mounted cone sleeve. Under the action of the cone surface of the seat-mounted cone sleeve, the slip moves away from the seat-mounted cone sleeve radially.

[0021] Furthermore, the drive assembly includes a cylinder liner, a cylinder block, a first sealing ring, and a second sealing ring;

[0022] The cylinder block is connected to the slip assembly, and the cylinder liner is fitted onto the cylinder block and connected to the movable sleeve;

[0023] The cylinder block and the cylinder liner form a drive space. When the cylinder is seated, liquid enters the drive space to push the cylinder liner to move toward the slip assembly.

[0024] The first sealing ring and the second sealing ring are sleeved on the cylinder body and inserted into the cylinder sleeve. The first sealing ring and the second sealing ring are respectively disposed on both sides of the drive space along the axial direction of the cylinder body.

[0025] Furthermore, the drive assembly also includes a first self-expanding seal and a second self-expanding seal;

[0026] The first self-expanding seal and the second self-expanding seal are sleeved on the cylinder body and inserted into the cylinder liner. The first self-expanding seal is located on the side of the first sealing ring away from the drive space, and the second self-expanding seal is located on the side of the second sealing ring away from the drive space.

[0027] Furthermore, the sealing mechanism also includes a self-expanding sealing component, which is sleeved on the connecting sleeve and disposed between the combined sealing component and the seat cone sleeve;

[0028] The self-expanding sealing assembly includes a self-expanding sealing ring, a first limiting ring, and a second limiting ring arranged sequentially along the axial direction of the connecting sleeve; the second limiting ring is disposed between the self-expanding sealing ring and the seat cone sleeve.

[0029] In another aspect, the present invention provides a gas storage system including the aforementioned ball-and-socket tailpipe hanger.

[0030] In summary, the technical effects achieved by this invention are as follows:

[0031] The ball seat tail tube hanger provided by the present invention includes a central tube, a seat-holding and pressing mechanism, and a sealing mechanism; one end of the central tube is connected to the seat-holding and pressing mechanism, and the central tube and the seat-holding and pressing mechanism are inserted into the sealing mechanism; the seat-holding and pressing mechanism includes a hinge sleeve, a hinge shaft, a ball seat, and a seat sealing ball, and the hinge sleeve is connected to the central tube; one end of the hinge shaft is connected to the ball seat, and the other end is inserted into the hinge sleeve and rotatably connected to the hinge sleeve, configured to be able to rotate around the axis of the central tube; during seat-holding, the seat sealing ball passes through the central tube, the hinge sleeve, and the hinge shaft in sequence and sits into the ball seat.

[0032] The ball seat tailpipe hanger provided by this invention integrates the ball seat onto the hanger's insertion tool. After the hanger completes the mounting, the ball seat can be removed from the wellbore, avoiding the need to drill out the blind plate. During the release process, as the central tube rotates, the ball seat does not rotate synchronously due to the hinge action of the hinge shaft, avoiding the release being affected by inconsistencies in the coaxiality of the central tube and the ball seat. Attached Figure Description

[0033] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the structure of the ball seat tailpipe hanger provided in an embodiment of the present invention;

[0035] Figure 2 This is a structural schematic diagram of the combined sealing assembly, the first centralizer, and the self-expanding sealing assembly.

[0036] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0037] Figure 4 This is a schematic diagram of the drive component.

[0038] Figure 5 This is a schematic diagram of the seat-mounted pressure-retaining mechanism;

[0039] Figure 6 This is a schematic diagram of the combined sealing assembly;

[0040] Figure 7 This is a schematic diagram of the structure of a metal sealing body;

[0041] Figure 8 This is a schematic diagram of the structure of a self-expanding sealing assembly.

[0042] Icons: 10, Central Tube; 40, Input Tool;

[0043] 101. Liquid passage hole; 201. Hinge sleeve; 202. Hinge shaft; 203. Ball seat; 204. Sealing ball;

[0044] 100. Connecting sleeve; 200. Combined sealing assembly; 300. Seat cone sleeve; 400. Slip assembly; 500. Movable sleeve; 600. Drive assembly; 700. Self-expanding sealing assembly; 31. Sand cap; 32. Return sleeve; 33. Expansion seal shear pin; 34. Expansion seal sleeve; 35. First centralizer; 36. Second centralizer; 37. Tailpipe; 38. Limiting ring; 39. Anti-reverse ring;

[0045] 210. First protective ring; 220. First rubber sleeve; 230. Metal sealing body; 240. Second rubber sleeve; 250. Second protective ring; 260. First sealing element; 270. Second sealing element; 231. First finned sealing ring; 232. Main sealing ring; 233. Second finned sealing ring; 234. First mounting groove; 235. Second mounting groove;

[0046] 610, Cylinder liner; 620, Cylinder block; 630, First sealing ring; 640, Second sealing ring; 650, First self-expanding seal; 660, Second self-expanding seal; 670, First spacer ring; 680, Second spacer ring; 690, Shear pin; 6110, Guide pin; 601, Drive space; 602, Injection hole;

[0047] 710. Self-expanding sealing ring; 720. First limiting ring; 730. Second limiting ring. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0049] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0050] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0051] Most commonly used hangers place the ball seat at the bottom of the well, but placing the ball seat at the bottom of the well with a hanging screen pipe makes it impossible to complete the pressure build-up and hanging. Using a blind flange for pressure build-up will bring the risk of drilling and removing the blind flange later and increase construction costs.

[0052] In view of this, the present invention provides a ball seat tail tube hanger, including a central tube 10, a seat-holding and pressing mechanism, and a sealing mechanism; one end of the central tube 10 is connected to the seat-holding and pressing mechanism, and the central tube 10 and the seat-holding and pressing mechanism are inserted into the sealing mechanism; the seat-holding and pressing mechanism includes a hinge sleeve 201, a hinge shaft 202, a ball seat 203, and a seat sealing ball 204, the hinge sleeve 201 is connected to the central tube 10; one end of the hinge shaft 202 is connected to the ball seat 203, and the other end is inserted into the hinge sleeve 201 and rotatably connected to the hinge sleeve 201, configured to be able to rotate around the axis of the central tube 10; during seat-holding, the seat sealing ball 204 passes sequentially through the central tube 10, the hinge sleeve 201, and the hinge shaft 202 and sits into the ball seat 203.

[0053] The ball seat tailpipe hanger provided by this invention integrates the ball seat 203 onto the hanger insertion tool 40. After the hanger completes the mounting, the ball seat 203 can be removed from the wellbore, avoiding the need to drill out the blind plate. During the release process, as the central tube 10 rotates, the ball seat 203 does not rotate synchronously due to the hinge action of the hinge shaft 202, avoiding the release being affected by the inconsistency in the coaxiality of the central tube 10 and the ball seat 203.

[0054] The following combination Figures 1-8 The structure and shape of the ball-mounted tailpipe hanger provided in this embodiment are described in detail below:

[0055] In this embodiment, a liquid passage hole 101 is provided on the side wall of the central tube 10 to connect the inner cavity of the central tube 10 and the annular space formed by the central tube 10 and the sealing mechanism. When the hanger is in place, it serves as a flow channel for high-pressure liquid and as a discharge channel for liquid inside the tube when the tube is lifted after being released.

[0056] In this embodiment, the upper end of the hinge sleeve 201 is fixed to the central tube 10 by a pipe thread. The lower end of the pipe thread is provided with two straight holes of different diameters and a tapered hole connecting the two straight holes. The hinge shaft 202 has a T-shaped tube structure, with an internal through hole composed of a tapered hole and a straight hole, and a spherical transition surface at the external step. The external step of the hinge shaft 202 cooperates with the tapered hole of the hinge sleeve 201 to prevent the hinge shaft 202 from falling off, so that the hinge shaft 202 is suspended from the hinge sleeve 201. The hinge shaft 202 and the hinge sleeve 201 have large clearances in both the axial and radial directions. The upper end of the hinge shaft 202 also has a large clearance from the lower end of the central tube 10, allowing the hinge shaft 202 to rotate freely around the axis of the central tube 10 within the hinge sleeve 201. It also has a certain vertical clearance in the axial direction. The upper limit of the axial movement of the hinge shaft 202 is the lower end face of the central tube 10, and the lower limit is the junction of the tapered hole of the hinge sleeve 201 and the spherical transition surface of the hinge shaft 202. The upper end of the inner surface of the ball seat 203 is threaded to the lower end of the hinge shaft 202 and fixed by radially arranged screws. The middle section of the inner surface of the ball seat 203 is the setting tapered hole of the setting ball 204, and the lower section is a through hole. The outer surface of the ball seat 203 has a stepped structure. A sealing ring is fitted at the contact point between the ball seat 203 and the inner wall of the tail tube 37 to achieve a seal between them.

[0057] In this embodiment, the sealing mechanism includes a sandproof cap 31, a connecting sleeve 100, a seat cone sleeve 300, a slip assembly 400, a drive assembly 600, and a tailpipe 37 connected in sequence. The connecting sleeve 100 is inserted into the seat cone sleeve 300 and threadedly connected to the seat cone sleeve 300. The sealing mechanism also includes a return sleeve 32, an expansion sleeve 34, a combined sealing assembly 200, a first centralizer 35, a self-expanding sealing assembly 700, and an expansion shear pin 33 and a backlash ring 39, which are sequentially fitted onto the connecting sleeve 100. The end of the self-expanding sealing assembly 700 away from the first centralizer 35 is a seated cone sleeve 300. The return sleeve 32 is fitted onto the expansion sleeve 34 and threadedly connected to it. The backlash ring 39 is inserted into the expansion sleeve 34 and threadedly connected to it. At the same time, the backlash ring 39 is fitted onto the connecting sleeve 100 and engages with it through a backlash tooth. The expansion shear pin 33 is inserted into both the connecting sleeve 100 and the expansion sleeve 34. The sealing mechanism also includes a movable sleeve 500, a second centralizer 36, and a limiting ring 38. The movable sleeve 500 is connected to the drive assembly 600 and pushes the slips to move under the drive of the drive assembly 600. The second centralizer 36 is located below the drive assembly 600, and the limiting ring 38 is located above the movable sleeve 500 and installed on the seat cone sleeve 300 to limit the distance that the movable sleeve 500 moves toward the slip assembly 400.

[0058] In this embodiment, the anti-reverse teeth are used to achieve one-way locking, and the shape of the teeth is a right-angled triangle, such as... Figure 3As shown, one leg of the right triangle is perpendicular to the axis of the connecting sleeve 100. This leg prevents relative axial movement between the connecting sleeve 100 and the anti-reverse ring 39. The hypotenuse of the right triangle allows for relative axial movement between the two. That is, as... Figure 3 As shown, when the anti-reverse ring 39 moves downward, it can move, but when it moves upward, it is blocked and cannot move, thus ensuring the stability of the sealing state of the combined seal.

[0059] In this embodiment, the combined sealing assembly 200 is sleeved on the connecting sleeve 100, and the central tube 10 is inserted into the connecting sleeve 100; the combined sealing assembly 200 includes a first protective ring 210, a first rubber sleeve 220, a metal sealing body 230, a second rubber sleeve 240, and a second protective ring 250, which are sequentially sleeved along the axial direction of the connecting sleeve 100, as follows: Figure 6 As shown, one end of the first rubber tube 220 is inserted into the first protective ring 210, and the other end is inserted into the metal sealing body 230; one end of the second rubber tube 240 is inserted into the second protective ring 250, and the other end is inserted into the metal sealing body 230; the first protective ring 210 and the second protective ring 250 are configured to approach each other to push the metal sealing body 230 and squeeze the first rubber tube 220 and the second rubber tube 240, thereby causing the first rubber tube 220 and the second rubber tube 240 to expand.

[0060] In this embodiment, the combined sealing assembly 200 further includes a first sealing element 260 and a second sealing element 270; the outer wall of the metal sealing body 230 is provided with a first mounting groove 234, and the inner wall is provided with a second mounting groove 235; the first sealing element 260 is fitted into the metal sealing body 230 and installed in the first mounting groove 234; the second sealing element 270 is inserted into the metal sealing body 230 and installed in the second mounting groove 235, and the second sealing element 270 is fitted into the connecting sleeve 100.

[0061] In this embodiment, the metal sealing body 230 includes a first wing-shaped sealing ring 231, a main sealing ring 232, and a second wing-shaped sealing ring 233 arranged sequentially along the axial direction of the connecting sleeve 100; a first rubber sleeve 220 is inserted into the first wing-shaped sealing ring 231, and a second rubber sleeve 240 is inserted into the second wing-shaped sealing ring 233; when the first rubber sleeve 220 is compressed and expanded by the first protective ring 210 and the main sealing ring 232, the first rubber sleeve 220 pushes the first wing-shaped sealing ring 231 to flip over; when the second rubber sleeve 240 is compressed and expanded by the second protective ring 250 and the main sealing ring 232, the second rubber sleeve 240 pushes the second wing-shaped sealing ring 233 to flip over.

[0062] Specifically, the combined sealing assembly 200 is fitted onto the connecting sleeve 100 with a clearance fit and has a certain axial clearance. The upper end of the combined sealing assembly 200 is restricted from axial upward movement by the end face of the expansion sleeve 34, and the lower end is restricted from axial downward movement by the first centralizer 35, which is threadedly connected to the connecting sleeve 100. Taking the plane passing through the midpoint of the axial length of the metal sealing body 230 and perpendicular to the axis of the metal sealing body 230 as the first plane, the first wing-shaped sealing ring 231 and the second wing-shaped sealing ring 233 are symmetrical about the first plane, and the main sealing ring 232 has a symmetrical structure about the first plane. The first mounting groove 234 is a pot-bottom shaped mounting groove, and the inner wall of the mounting groove of the main sealing ring 232 is provided with a second mounting groove 235. The inner wall of the main sealing ring 232 is a cylindrical surface, and the upper and lower ends of the cylindrical surface are inclined surfaces that slope away from their own axis. The joint between the inclined surface and the inner wall of the wing-shaped sealing ring is an arc-shaped surface, and the inner wall of the wing-shaped sealing ring is a cylindrical surface. Along its own axis, the metal sealing body 230 is provided with a series of interconnected circular holes, conical holes, circular holes, conical holes, and circular holes, with the central circular hole having the smallest diameter. The bottom of the pot-shaped mounting groove is arc-shaped, and the inclined surfaces connecting to the two ends of the arc slope away from its own axis, meaning the diameter of the pot-shaped mounting groove gradually decreases and then increases again. The joint between the pot-shaped mounting groove and the first wing-shaped sealing ring 231 and the second wing-shaped sealing ring 233 is an arc-shaped surface. The two arc-shaped surfaces are concentric so that the joint between the first wing-shaped sealing ring 231 and the main sealing ring 232 forms a sidewall of equal thickness, and the joint between the second wing-shaped sealing ring 233 and the main sealing ring 232 forms a sidewall of equal thickness. That is, the arc-shaped transition section at the joint has the same wall thickness as the first wing-shaped sealing ring 231 and the second wing-shaped sealing ring 233. The second mounting groove 235 is set as an annular groove with a rectangular cross-section.

[0063] Under external force, the two wing-shaped sealing rings expand outward in clockwise and counterclockwise directions, respectively, using the center of the arc-shaped surface at the junction of the inclined surface of their inner walls and the cylindrical surface of the inner wall of the main sealing ring 232 as a fulcrum. This forms flanges away from their own axis until they fit against the outer pipe wall. As the external force increases, sufficient contact pressure is formed with the outer pipe wall, achieving a metal seal. Simultaneously, the main sealing ring 232 also fits tightly against the connecting sleeve 100 under external force, forming contact pressure and achieving a metal seal. The first rubber sleeve 220 and the second rubber sleeve 240 are identical annular rubber sleeves. The structural features of their contact parts with the metal sealing body 230 are consistent with those of the metal sealing body 230, namely, the design of a cylindrical surface, a conical surface, and an arc-shaped surface where the cylindrical and conical surfaces meet. The contact areas between the first rubber sleeve 220 and the first protective ring 210, and between the second rubber sleeve 240 and the second protective ring 250, are designed with cylindrical, conical, and straight surfaces consistent with the protective rings, with the cylindrical and straight surfaces connected by the conical surfaces. The first sealing element 260 has the same structure as the first mounting groove 234, with an external cylindrical structure; the second sealing element 270 is an annular sealing element with a rectangular cross-section. After the first sealing element 260 and the second sealing element 270 are compressed and deformed by the metal sealing body 230, they are completely enclosed within the metal sealing body 230, effectively protecting its sealing performance and extending its sealing life. The combined sealing assembly 200 combines a four-fold sealing combination of rubber sleeve sealing, metal ring sealing, first sealing element 260 sealing, and second sealing element 270 sealing. The external force that causes the rubber sleeve to expand and the metal sealing body 230 to deform is achieved by the feeding tool 40 axially pressing down on the return sleeve 32, causing the expansion sleeve 34 connected to the return sleeve 32 to shear the expansion sleeve shear pin 33 installed on the expansion sleeve 34 and the connecting sleeve 100, thereby axially compressing the combined sealing assembly 200. At the same time, the engagement of the anti-reverse teeth of the connecting sleeve 100 and the anti-reverse ring 39 can prevent springback and unsealing. The outer diameters of all parts of the combined sealing assembly 200 are consistent and are all smaller than the outer diameters of the first centralizer 35 and the second centralizer 36.

[0064] In this embodiment, the first straightener 35 is a rigid straightener with multiple straightening ridges, which is installed and fixed on the connecting sleeve 100 by a threaded connection. The first rubber sleeve 220, the second rubber sleeve 240, the first seal 260, and the second seal 270 are made of rubber, and the metal sealing body 230 is made of a highly ductile metal material, such as aluminum alloy or copper alloy.

[0065] In this embodiment, the seat cone sleeve 300, the slip assembly 400, the movable sleeve 500, and the drive assembly 600 are sequentially fitted onto the central tube 10; the seat cone sleeve 300 is connected to the connecting sleeve 100 and inserted into the slip assembly 400; the drive assembly 600 is used to push the movable sleeve 500; the movable sleeve 500 pushes the slip in the slip assembly 400 to move along the axial direction of the seat cone sleeve 300; under the action of the conical surface of the seat cone sleeve 300, the slip moves away from the seat cone sleeve 300 radially.

[0066] In this embodiment, the drive assembly 600 includes a cylinder liner 610, a cylinder body 620, a first sealing ring 630, and a second sealing ring 640, as shown below. Figure 4 As shown; the cylinder body 620 is connected to the slip assembly 400, and the cylinder liner 610 is fitted onto the cylinder body 620 and connected to the movable sleeve 500; the cylinder body 620 and the cylinder liner 610 form a driving space 601. During mounting, liquid enters the driving space 601 to push the cylinder liner 610 towards the slip assembly 400, thereby driving the movable sleeve 500 to move and push the slip, causing the slip to move radially under the action of the conical surface of the mounting cone sleeve 300 and engage with the inner wall of the wellbore; the first sealing ring 630 and the second sealing ring 640 are fitted onto the cylinder body 620 and inserted into the cylinder liner 610. The first sealing ring 630 and the second sealing ring 640 are respectively located on both sides of the driving space 601 along the axial direction of the cylinder body 620. The first sealing ring 630 and the second sealing ring 640 are set as O-rings.

[0067] Specifically, the cylinder body 620 is provided with a liquid injection hole 602, and the inner cavity of the central tube 10, the liquid passage hole 101, the annular space between the central tube 10 and the sealing mechanism, the liquid injection hole 602, and the drive space 601 are connected in sequence.

[0068] Furthermore, the drive assembly 600 also includes a first self-expanding seal 650 and a second self-expanding seal 660; the first self-expanding seal 650 and the second self-expanding seal 660 are sleeved on the cylinder body 620 and inserted into the cylinder liner 610. The first self-expanding seal 650 is located on the side of the first sealing ring 630 away from the drive space 601, and the second self-expanding seal 660 is located on the side of the second sealing ring 640 away from the drive space 601. The first self-expanding seal 650 and the second self-expanding seal 660 are made of oil- or water-swellable materials, such as liquid-swellable rubber. The first self-expanding seal 650 and the second self-expanding seal 660 are installed with a gap, so that the drive assembly 600 does not generate contact pressure with the cylinder liner 610 before starting, thus avoiding excessive axial movement friction of the cylinder liner 610. In the later stage of suspension setup, the first self-expanding seal 650 and the second self-expanding seal 660 react fully with the well fluid and then expand, and come into contact with the inner wall of the cylinder liner 610 to generate contact pressure, thereby achieving a seal. This is used for later sealing compensation of the first sealing ring 630 and the second sealing ring 640.

[0069] In this embodiment, the drive assembly 600 further includes a first spacer ring 670, a second spacer ring 680, a shear pin 690, and a guide pin 6110. The first spacer ring 670 and the second spacer ring 680 are sleeved on the cylinder body 620 and inserted into the cylinder liner 610, and are located on both sides of the first self-expanding seal 650 to limit the first self-expanding seal 650. The shear pin 690 is inserted into both the cylinder liner 610 and the cylinder body 620. When the drive assembly 600 is started, the cylinder liner 610 moves and shears the shear pin 690. The cylinder body 620 has a sliding groove extending axially. The guide pin 6110 is installed on the cylinder liner 610 and inserted into the sliding groove. When the cylinder liner 610 moves, it drives the guide pin 6110 to slide along the sliding groove, preventing relative rotation between the cylinder liner 610 and the cylinder body 620.

[0070] In this embodiment, the sealing mechanism further includes a self-expanding sealing assembly 700, which is sleeved on the connecting sleeve 100 and disposed between the combined sealing assembly 200 and the seat cone sleeve 300. The self-expanding sealing assembly 700 includes a self-expanding sealing ring 710, a first limiting ring 720, and a second limiting ring 730 arranged sequentially along the axial direction of the connecting sleeve 100; the second limiting ring 730 is disposed between the self-expanding sealing ring 710 and the seat cone sleeve 300. The structure of the first limiting ring 720 and the second limiting ring 730 is the same as that of the first protective ring 210 and the second protective ring 250. The self-expanding sealing ring 710 is made of a material that expands when exposed to oil or water, such as liquid-expanding rubber.

[0071] Specifically, the self-expanding sealing assembly 700 is disposed between the first stabilizer 35 and the seat cone sleeve 300, and the displacement distance is limited by both.

[0072] Based on the ball seat tailpipe hanger provided in this embodiment, a gas storage system is proposed, including the aforementioned ball seat tailpipe hanger.

[0073] The working process of the ball-mounted tailpipe hanger provided in this embodiment is as follows:

[0074] The insertion tool 40 is threadedly connected to the central tube 10 and the return sleeve 32. During setup, the setting ball 204 is first inserted to seal the ball seat 203, allowing liquid to enter the drive space 601 from the central tube 10. This drives the cylinder liner 610 to move, thereby engaging the slip assembly 400 and achieving slip engagement with the wellbore inner wall. Subsequently, the insertion tool 40 presses down to move the return sleeve 32 and the expansion sleeve 34, thereby compressing the combined sealing assembly 200. This causes the first rubber sleeve 220 and the second rubber sleeve 240 to expand, and the metal sealing body 230 to contact the well wall, achieving sealing. When released, the insertion tool 40 drives the hinge sleeve 201 to rotate, thereby separating the insertion tool 40 from the return sleeve 32.

[0075] The ball seat tailpipe hanger provided in this embodiment can lift the ball seat 203, avoiding the need to drill out the blind plate. After the hanger is seated, the ball seat 203 can be lifted out of the wellbore along with the feed tool 40 and the center tube 10. After the hanger is seated, the feed tool 40 and the center tube 10 are rotated by rotating the feed drill string, thus releasing the hanger. During the rotation of the center tube 10, the ball seat 203 does not rotate synchronously due to the hinge action of the hinge shaft 202, avoiding the impact of inconsistent coaxiality between the center tube 10 and the ball seat 203 on the release. The seating method is hydraulic seating, the release method is mechanical back-lock release, and the enhanced combined sealing expansion method is that the feed string is mechanically pressed down to expand and seal. The seating, expansion and sealing, and release do not interfere with each other.

[0076] The ball-mounted tailpipe hanger provided in this embodiment has an enhanced sealing function, achieved through a combined sealing assembly 200, a self-expanding sealing assembly 700, and sealing components disposed within the drive assembly 600. The combined sealing assembly 200 and the self-expanding sealing assembly 700 enhance annular sealing capability, while the sealing components within the drive assembly 600 enhance internal and external sealing capability, improving the tendency of conventional sealing systems to fail during later injection and production processes. This enhanced sealing structure is not only applicable to hangers with the structure shown in the illustration, but also to any tailpipe hanger. "Any" means that the hanger's suspension part can be a single-stage or multi-stage hydraulic cylinder, and it is also applicable to compression packer structures.

[0077] The ball seat tailpipe hanger provided in this embodiment enables drill-free pressure-locking and mounting systems for hangers during the completion of gas storage facilities and geothermal well screen pipes, and improves the sealing performance of the packer system, meeting the construction needs of gas storage facilities and geothermal wells, and improving construction efficiency and tool performance.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A ball-mounted tailpipe hanger, characterized in that, It includes a central tube (10), a seat-hanging pressure mechanism, and a sealing mechanism; one end of the central tube (10) is connected to the seat-hanging pressure mechanism, and the central tube (10) and the seat-hanging pressure mechanism are inserted into the sealing mechanism; The seat-holding pressure mechanism includes a hinge sleeve (201), a hinge shaft (202), a ball seat (203), and a seat sealing ball (204). The hinge sleeve (201) is connected to the central tube (10). One end of the hinge shaft (202) is connected to the ball seat (203), and the other end is inserted into the hinge sleeve (201) and rotatably connected to the hinge sleeve (201), configured to be able to rotate around the axis of the central tube (10). When the ball is seated, the seated ball (204) passes through the central tube (10), the hinge sleeve (201), and the hinge shaft (202) in sequence and sits into the ball seat (203). The sealing mechanism includes a connecting sleeve (100) and a combined sealing assembly (200); The combined sealing assembly (200) is sleeved on the connecting sleeve (100), and the central tube (10) is inserted into the connecting sleeve (100); the combined sealing assembly (200) includes a first protective ring (210), a first rubber sleeve (220), a metal sealing body (230), a second rubber sleeve (240), and a second protective ring (250) sequentially sleeved along the axial direction of the connecting sleeve (100); The first protective ring (210) and the second protective ring (250) are configured to approach each other to push the metal seal (230) and squeeze the first rubber cylinder (220) and the second rubber cylinder (240), thereby causing the first rubber cylinder (220) and the second rubber cylinder (240) to expand; The combined sealing assembly (200) further includes a first seal (260) and a second seal (270); the first seal (260) is fitted onto the metal sealing body (230), and the second seal (270) is inserted into the metal sealing body (230).

2. The ball-mounted tailpipe hanger according to claim 1, characterized in that, The central tube (10) has a liquid passage hole (101) on its side wall.

3. The ball-mounted tailpipe hanger according to claim 1, characterized in that, One end of the first rubber tube (220) is inserted into the first protective ring (210), and the other end is inserted into the metal sealing body (230); one end of the second rubber tube (240) is inserted into the second protective ring (250), and the other end is inserted into the metal sealing body (230).

4. The ball-mounted tailpipe hanger according to claim 3, characterized in that, The outer wall of the metal sealing body (230) is provided with a first mounting groove (234), and the inner wall is provided with a second mounting groove (235); the first sealing element (260) is installed in the first mounting groove (234); the second sealing element (270) is installed in the second mounting groove (235), and the second sealing element (270) is fitted onto the connecting sleeve (100).

5. The ball-mounted tailpipe hanger according to claim 4, characterized in that, The metal sealing body (230) includes a first wing-shaped sealing ring (231), a main sealing ring (232), and a second wing-shaped sealing ring (233) arranged sequentially along the axial direction of the connecting sleeve (100). The first rubber tube (220) is inserted into the first wing-shaped sealing ring (231), and the second rubber tube (240) is inserted into the second wing-shaped sealing ring (233). When the first rubber cylinder (220) is squeezed and expanded by the first protective ring (210) and the main sealing ring (232), the first rubber cylinder (220) pushes the first wing-shaped sealing ring (231) to flip over; When the second rubber cylinder (240) is squeezed and expanded by the second protective ring (250) and the main sealing ring (232), the second rubber cylinder (240) pushes the second wing-shaped sealing ring (233) to flip over.

6. The ball-mounted tailpipe hanger according to claim 3, characterized in that, The sealing mechanism also includes a seat cone sleeve (300), a slip assembly (400), a movable sleeve (500), and a drive assembly (600) sequentially fitted onto the central tube (10). The seat-mounted cone sleeve (300) is connected to the connecting sleeve (100) and inserted into the slip assembly (400). The drive assembly (600) is used to push the movable sleeve (500). The movable sleeve (500) pushes the slip in the slip assembly (400) to move along the axial direction of the seat-mounted cone sleeve (300). Under the action of the conical surface of the seat-mounted cone sleeve (300), the slip moves away from the seat-mounted cone sleeve (300) radially.

7. The ball-mounted tailpipe hanger according to claim 6, characterized in that, The drive assembly (600) includes a cylinder liner (610), a cylinder block (620), a first sealing ring (630), and a second sealing ring (640). The cylinder block (620) is connected to the slip assembly (400), and the cylinder liner (610) is fitted onto the cylinder block (620) and connected to the movable sleeve (500); The cylinder block (620) and the cylinder liner (610) form a drive space (601). When the cylinder is seated, liquid enters the drive space (601) to push the cylinder liner (610) toward the slip assembly (400). The first sealing ring (630) and the second sealing ring (640) are sleeved on the cylinder body (620) and inserted into the cylinder liner (610). The first sealing ring (630) and the second sealing ring (640) are respectively disposed on both sides of the drive space (601) along the axial direction of the cylinder body (620).

8. The ball-mounted tailpipe hanger according to claim 7, characterized in that, The drive assembly (600) further includes a first self-expanding seal (650) and a second self-expanding seal (660). The first self-expanding seal (650) and the second self-expanding seal (660) are sleeved on the cylinder body (620) and inserted into the cylinder liner (610). The first self-expanding seal (650) is located on the side of the first sealing ring (630) away from the drive space (601), and the second self-expanding seal (660) is located on the side of the second sealing ring (640) away from the drive space (601).

9. The ball-mounted tailpipe hanger according to claim 6, characterized in that, The sealing mechanism further includes a self-expanding sealing assembly (700), which is sleeved on the connecting sleeve (100) and disposed between the combined sealing assembly (200) and the seat cone sleeve (300); The self-expanding sealing assembly (700) includes a self-expanding sealing ring (710), a first limiting ring (720) and a second limiting ring (730) arranged sequentially along the axial direction of the connecting sleeve (100); the second limiting ring (730) is disposed between the self-expanding sealing ring (710) and the seat cone sleeve (300).

10. A gas storage system, characterized in that, Including the ball seat tailpipe hanger as described in any one of claims 1-9.

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