Downhole hanger and matched tool

Abstract

The underground hanger comprises a hanger body and a setting tool, the top end of the hanger body is in threaded connection with a threaded sleeve, the setting tool comprises a setting center pipe, the outer wall of the setting center pipe is sequentially sleeved with a setting claw, a setting upper shearing ring and a baffle ring, a groove is formed in the outer wall of the setting center pipe, and the setting claw is arranged in the groove. The setting claw is located in the groove and connected with the outer wall of the setting center pipe in a sliding mode, an emergency pin is arranged between the setting upper shearing ring and the setting center pipe, the baffle ring is fixedly connected with the outer wall of the setting center pipe, two releasing modes are formed through the setting claw, one releasing mode is that the setting claw is separated from the threaded sleeve through rotation, and the other releasing mode is that the setting claw is separated from the threaded sleeve through rotation. According to the other mode, the setting upper shearing ring abuts against the setting claw and is bent towards the groove to be separated from the threaded sleeve, and it is effectively ensured that releasing is completed.

Description

Technical Field

[0001] This utility model relates to the field of downhole tool technology, specifically to a downhole hanger and its supporting tools. Background Technology

[0002] Fracturing technology is increasingly being used in oil and gas wells. The commonly used fracturing tubing string is the hanger. During fracturing operations, it is generally carried out with the help of the hanger used to transport the liner and the delivery or setting tools used to attach the liner to the wellbore. For example, the utility model patent with authorization announcement number CN203362082U entitled "A Setting Tool for a Hanger for Gas Well Fracturing" is used in the field. The device is connected to the fracturing tubing at the top and lowered to a predetermined position in the well. The pre-placed sealing ball is placed on the sliding sleeve of the device. Hydraulic pressure is applied to the device from the surface to generate an axial downward load. Liquid is introduced from the hole in the upper central tube, pushing the upper and lower pistons downward, thereby driving the upper and lower piston sleeves downward, realizing the hydraulic setting of the packer. When hydraulic pressure is continued to be applied, it acts on the pre-placed sealing ball of the device. When the design pressure value is reached, the shear pin shears off, the sliding sleeve moves downward, the spring claw loses the internal support of the sliding sleeve, the spring claw retracts, and the hydraulic release of the setter is achieved.

[0003] However, the aforementioned setting tool has only one release method. In case of an emergency (such as getting stuck while rotating), it cannot release the tool, which will affect subsequent work. Utility Model Content

[0004] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and propose a downhole hanger and supporting tools to solve the technical problem that the existing technology has a single way of dropping the handle, and once the dropping fails, it will be impossible to continue dropping the handle.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a downhole hanger and supporting tools, including a hanger and a setting tool. The top of the hanger is threadedly connected to a threaded sleeve. The setting tool includes a setting center tube. The outer wall of the setting center tube is sequentially fitted with a setting claw, a setting upper shear ring, and a retaining ring. The outer wall of the setting center tube has a groove. The setting claw is located in the groove and is slidably connected to the outer wall of the setting center tube. An emergency pin is provided between the setting upper shear ring and the setting center tube. The retaining ring is fixedly connected to the outer wall of the setting center tube.

[0007] In some embodiments, the groove is provided with a protrusion.

[0008] In some embodiments, the hanger further includes a central tube, an upper cone, a slip member, a lower cone, a check valve, a piston member, a protective sleeve, and a lower connector. The upper cone, the slip member, the lower cone, the check valve, the piston member, and the protective sleeve are sequentially fitted onto the outer wall of the central tube. The two ends of the central tube are respectively connected to the threaded sleeve and the lower connector.

[0009] In some embodiments, a recycling shearing ring is provided between the lower connector and the protective sleeve, and an annular groove is provided on the outer wall of the lower connector, with the recycling shearing ring installed in the annular groove.

[0010] In some embodiments, a C-ring is further provided between the lower connector and the protective sleeve.

[0011] In some embodiments, the side wall of the central tube is provided with a first pressure transmission hole, the side wall of the seated central tube is provided with a second pressure transmission hole, and the piston, the first pressure transmission hole and the second pressure transmission hole are interconnected.

[0012] In some embodiments, a starting pin is provided between the lower cone and the check valve.

[0013] In some embodiments, a sliding hole is provided on the side wall of the central tube, and a slot is provided on the outer wall of the setting central tube. A key block is slidably fitted in the sliding hole, and the end of the key block facing the setting central tube is adapted to the slot.

[0014] In some embodiments, the setting tool further includes a setting cover, a ball seat, a ball, a lower setting shear ring, and a scoop basket. The setting cover is located at the top of the setting claw and is fixedly sleeved on the outer wall of the setting center tube. The lower setting shear ring and the scoop basket are sequentially connected to the bottom end of the setting center tube. The ball seat and the ball are sleeved inside the lower setting shear ring, and a release pin is provided between the ball seat and the lower setting shear ring. A third pressure transmission hole is provided on the side wall of the scoop basket.

[0015] In some embodiments, a recycling tool is also included, the recycling tool comprising a recycling center tube, a recycling cover, and a recycling claw, the recycling cover and the recycling claw being sequentially sleeved on the outer wall of the recycling center tube.

[0016] Compared with the prior art, the downhole hanger and matching tools provided by this utility model have two release methods through the setting of the setting claw. One is that the setting claw and the threaded sleeve are separated by rotation, and the other is that the setting claw is bent towards the groove by the shear ring on the setting claw and is separated from the threaded sleeve, which effectively ensures the completion of release. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the structure of the hanger in a downhole hanger and its supporting tools provided in an embodiment of the present utility model;

[0018] Figure 2 This is a schematic diagram illustrating the connection relationship between the hanger and the setting tool in a downhole hanger and its accessories provided in this utility model embodiment;

[0019] Figure 3 This is a schematic diagram showing the connection relationship between the hanger and the recovery tool in a downhole hanger and supporting tools provided in this utility model embodiment.

[0020] Explanation of reference numerals in the attached drawings: 1. Suspension device; 11. Threaded sleeve; 12. Central tube; 121. First pressure transmission hole; 122. Sliding hole; 123. Key block; 13. Upper cone; 131. Restricting pin; 132. Fixing screw; 14. Slip piece; 141. Slip sleeve; 142. Slip; 143. Spring; 15. Lower cone; 151. Starting pin; 16. Check valve; 161. Locking ring; 162. Locking ring sleeve; 163. Cylindrical head screw; 17. Piston piece; 171. Piston; 172. Piston sleeve; 18. Protective sleeve; 181. C-ring; 19. 1. Lower connector; 191. Ring groove; 192. Recovering shear ring; 2. Setting tool; 21. Setting center tube; 211. Groove; 212. Protrusion; 213. Second pressure transmission hole; 214. Slot; 22. Setting claw; 23. Setting upper shear ring; 231. Emergency pin; 232. Set screw; 24. Retaining ring; 25. Setting cover; 26. Ball seat; 27. Ball; 28. Setting lower shear ring; 281. Release pin; 29. ​​Retrieval basket; 291. Third pressure transmission hole; 3. Recovering tool; 31. Recovering center tube; 32. Recovering cover; 33. Recovering claw. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.

[0022] To address the technical problem of a single dropping method that prevents further dropping once a dropping attempt fails, this utility model provides a downhole hanger and its supporting tools, enabling continued dropping after a failed attempt.

[0023] It should be noted that the downhole hanger and supporting tools described in this utility model are used in, but not limited to, oil and gas wells. For ease of explanation, this utility model only uses the application of a downhole hanger and supporting tools in an oil and gas well as an example for illustration. The principle of the downhole hanger and supporting tools applied in other types of scenarios is essentially the same as the principle applied in an oil and gas well, and will not be described in detail here.

[0024] Please see Figure 1 - Figure 3 ,in Figure 1 This is a schematic diagram of the structure of a downhole hanger and its supporting tools in one embodiment of the present invention. The downhole hanger and its supporting tools include a hanger 1 and a setting tool 2. The top end of the hanger 1 is threadedly connected to a threaded sleeve 11. The setting tool 2 includes a setting center tube 21. The outer wall of the setting center tube 21 is sequentially fitted with a setting claw 22, a setting upper shear ring 23, and a retaining ring 24. The outer wall of the setting center tube 21 has a groove 211. The setting claw 22 is located in the groove 211 and is slidably connected to the outer wall of the setting center tube 21. An emergency pin 231 is provided between the setting upper shear ring 23 and the setting center tube 21. The retaining ring 24 is fixedly connected to the outer wall of the setting center tube 21.

[0025] In this embodiment, the setting of the setting claw 22 constitutes two release methods. One is that the setting claw 22 and the threaded sleeve 11 are separated by rotation, and the other is that the setting claw 22 is separated from the threaded sleeve 11 by the shear ring 23 on the setting claw bending towards the groove 211, which effectively ensures the completion of the release.

[0026] Furthermore, the shear ring 23 on the set seal and the emergency pin 231 are fixedly connected by the set screw 232. The emergency release design in the set seal tool 2 includes the shear ring 23 on the set seal, the set screw 232 and the emergency pin 231. When the release cannot be achieved by rotating and lifting, the emergency pin 231 is broken off. The shear ring 23 on the set seal abuts against the set seal claw 22, causing the set seal claw 22 to be embedded in the groove 211, thereby separating the set seal claw 22 from the threaded sleeve 11, which can also complete the release operation.

[0027] It should be noted that the threaded sleeve 11 and the setting claw 22 are connected by threads to prevent the hanger 1 from shifting during pressurization.

[0028] It should be noted that the seated claw 22 is elastic.

[0029] In one embodiment, please refer to Figure 2 The groove 211 has a protrusion 212.

[0030] In this embodiment, the protrusion 212 supports the seating claw 22 when it rotates, preventing the seating claw 22 from bending during rotation and affecting the connection between the seating tool 2 and the hanger 1.

[0031] In one embodiment, please refer to Figure 1 - Figure 3The suspension device 1 also includes a central tube 12, an upper cone 13, a slip 14, a lower cone 15, a check valve 16, a piston 17, a protective sleeve 18, and a lower connector 19. The upper cone 13, slip 14, lower cone 15, check valve 16, piston 17, and protective sleeve 18 are sequentially fitted onto the outer wall of the central tube 12. The two ends of the central tube 12 are respectively connected to the threaded sleeve 11 and the lower connector 19.

[0032] In this embodiment, the threaded sleeve 11 is threadedly connected to the upper cone 13, so that the hanger 1 is threadedly connected to the setting tool 2 or the recovery tool 3 through the threaded sleeve 11. The upper cone 13 is threadedly connected to the central tube 12, and the central tube 12 is threadedly connected to the lower connector 19. When the hanging force below the hanger 1 increases, the force will act on the protective sleeve 18 and be transmitted to the upper cone 13. The upper cone 13 will continue to assist in squeezing the clamping piece 14, making the hanger 1 more tightly engaged.

[0033] Furthermore, both the upper cone 13 and the lower cone 15 are provided with limiting pins 131 to prevent the slip 142 from setting prematurely.

[0034] Furthermore, the slip component 14 includes a slip sleeve 141, a slip 142, and a spring 143. A fixing screw 132 is provided between the slip sleeve 141 and the upper cone 13 for transmitting torque and guiding.

[0035] Furthermore, the check ring 16 includes a locking ring 161 and a locking ring sleeve 162. The locking ring 161 and the locking ring sleeve 162 prevent the piston 17 from having reverse displacement, which would lead to unstable setting. At the same time, the locking ring 161 is provided with a cylindrical head screw 163 to prevent the locking ring 161 from rotating relative to the locking ring sleeve 162 and the central tube 12.

[0036] Furthermore, the piston component 17 includes a piston 171 and a piston sleeve 172.

[0037] In one embodiment, please refer to Figure 1 A recycling shearing ring 192 is provided between the lower connector 19 and the protective sleeve 18, and an annular groove 191 is provided on the outer wall of the lower connector 19, and the recycling shearing ring 192 is installed in the annular groove 191.

[0038] In this embodiment, annular grooves 191 for setting and unsetting are designed on both the lower cone 15 and the lower connector 19, which avoids the cost and time problems caused by machining holes, and replaces the shear pin with a lower-cost recycling shear ring 192.

[0039] In one embodiment, please refer to Figure 1 and Figure 3 A C-ring 181 is also provided between the lower connector 19 and the protective sleeve 18.

[0040] In this embodiment, the function of the C-ring 181 is to prevent the protective sleeve 18 from driving the piston sleeve 172, the locking ring sleeve 162 and the lower cone 15 to move upward during the recovery process of the hanger 1, thus preventing secondary sealing.

[0041] In one embodiment, please refer to Figure 1 and Figure 2 The side wall of the central tube 12 is provided with a first pressure transmission hole 121, and the side wall of the seated central tube 21 is provided with a second pressure transmission hole 213. The piston 17, the first pressure transmission hole 121 and the second pressure transmission hole 213 are interconnected.

[0042] In one embodiment, please refer to Figure 1 and Figure 2 A starting pin 151 is provided between the lower cone 15 and the check valve 16.

[0043] In this embodiment, during the setting operation, the setting tool 2 is pressurized internally, and the pressure squeezes the ball 27 to fit against the ball seat 26. Then, the pressure acts on the piston 171 through the second pressure transmission hole 213 and the first pressure transmission hole 121. The starting pin 151 reaches the shear value and is cut off. The pressure pushes the piston 171 to move, which drives the lower cone 15 to squeeze the slip 142. The slip 142 is anchored in the wellbore under the action of pressure, thus achieving the purpose of setting.

[0044] In one embodiment, please refer to Figure 1 and Figure 2 The side wall of the central tube 12 is provided with a sliding hole 122, and the outer wall of the seated central tube 21 is provided with a slot 214. A key block 123 is slidably sleeved in the sliding hole 122, and the end of the key block 123 facing the seated central tube 21 is adapted to the slot 214.

[0045] In this embodiment, the key block 123 can transmit torque during the lowering of the hanger 1.

[0046] In one embodiment, please refer to Figure 1 and Figure 2 The setting tool 2 also includes a setting cover 25, a ball seat 26, a ball 27, a setting lower shear ring 28, and a scoop basket 29. The setting cover 25 is located at the top of the setting claw 22 and is fixedly sleeved on the outer wall of the setting center tube 21. The setting lower shear ring 28 and the scoop basket 29 are sequentially connected to the bottom end of the setting center tube 21. The ball seat 26 and the ball 27 are sleeved inside the setting lower shear ring 28, and a release pin 281 is provided between the ball seat 26 and the setting lower shear ring 28. A third pressure transmission hole 291 is opened on the side wall of the scoop basket 29.

[0047] In one embodiment, please refer to Figure 3It also includes a recycling tool 3, which includes a recycling center tube 31, a recycling cover 32, and a recycling claw 33. The recycling cover 32 and the recycling claw 33 are sequentially fitted onto the outer wall of the recycling center tube 31.

[0048] In this embodiment, after the sealing operation is completed, the recovery tool 3 can be lowered in, and the hanger 1 can be taken out from the well by lifting and unsealing. The recovery claw 33 is threadedly connected to the threaded sleeve 11, so that the recovery tool 3 and the hanger 1 are fixedly connected.

[0049] To better understand this utility model, the following is combined with... Figures 1 to 3 The technical solution of this utility model is described in detail below:

[0050] During startup, pressure is applied downwards from the ground. The pressure then enters the piston 17 through the second pressure transmission hole 213 and the first pressure transmission hole 121. Since the piston 171 is connected to the lower cone 15 by threads, the pressure is transmitted to the starting pin 151. When the pressure reaches the shear value of the starting pin 151, the starting pin 151 is sheared. The piston 171 drives the lower cone 15 to squeeze the slip 142. Under the compression of the lower cone 15 and the upper cone 13, the slip 142 anchors the wellbore and completes the setting operation.

[0051] When releasing the object, continue to press downwards to knock down the ball 27 and ball seat 26, causing them to fall into the basket 29. The third pressure transmission hole 291 connects the upper and lower parts, reducing the pressure difference and preparing for the release. Then, rotate and lift the setting tool 2 to release the threaded connection between the setting claw 22 and the threaded sleeve 11, causing the setting tool 2 to move upwards and disengage from the hanger 1, completing the release operation. The setting tool 2 is designed with an emergency release device. When rotation and lifting fail to release the object (for example, the setting claw 22 and the threaded sleeve 11 are stuck and cannot be separated by rotation), the emergency pin 231 is broken, causing the retaining ring 24 to move upwards and abut against the upper shear ring 23 of the setting tool. The upper shear ring 23, under the abutment of the retaining ring 24, abuts against the setting claw 22, causing the setting claw 22 to embed into the groove 211, thus separating the setting claw 22 from the threaded sleeve 11. The setting tool 2 continues to be lifted, completing the release operation.

[0052] During retrieval, the retrieval tool 3 is lowered into the upper part. The retrieval tool 3 is fixed to the hanger 1 through the threaded connection between the retrieval claw 33 and the threaded sleeve 11. The retrieval tool 3 is lifted up, and the retrieval shear ring 192 is cut off. The retrieval tool 3 pulls the upper cone 13 upward, and the slip 142 loses its support. Under the elastic force of the spring 143, it is retrieved. The hanger 1 is released from the anchoring state. After the anchoring state is released, the retrieval tool 3 can continue to drive the hanger 1 to continue to move upward, completing the retrieval operation.

[0053] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A downhole hanger and mating tool, characterized by, The application relates to a hanging device and a setting tool. The recess is provided with a protrusion. The hanging device further comprises a central pipe, an upper cone, a slip member, a lower cone, a check member, a piston member, a protective sleeve and a lower joint, the upper cone, the slip member, the lower cone, the check member, the piston member and the protective sleeve are sequentially sleeved on the outer wall of the central pipe, and the two ends of the central pipe are connected with the threaded sleeve and the lower joint respectively.

2. A downhole hanger and companion tools as defined in claim 1, wherein, A recovery shear ring is arranged between the lower joint and the protective sleeve, and a ring groove is formed in the outer wall of the lower joint, and the recovery shear ring is arranged in the ring groove.

3. A downhole hanger and companion tools as defined in claim 1, wherein, A C-shaped ring is further arranged between the lower joint and the protective sleeve.

4. A downhole hanger and companion tools as defined in claim 3, wherein, A first pressure transmission hole is formed in the side wall of the central pipe, a second pressure transmission hole is formed in the side wall of the setting central pipe, the piston member, the first pressure transmission hole and the second pressure transmission hole are communicated with each other.

5. A downhole hanger and completion tool as defined in claim 3, wherein, A starting pin is arranged between the lower cone and the check member.

6. A downhole hanger and completion tool as defined in claim 3, wherein, A sliding hole is formed in the side wall of the central pipe, a clamping groove is formed in the outer wall of the setting central pipe, a key block is slidably sleeved in the sliding hole, and the key block is matched with the clamping groove at the end of the setting central pipe.

7. A downhole hanger and completion tool as defined in claim 3, wherein, The setting tool further comprises a setting cover sleeve, a ball seat, a ball, a setting lower shear ring and a fishing basket, the setting cover sleeve is arranged at the top end of the setting pawl and is fixedly sleeved on the outer wall of the setting central pipe, the setting lower shear ring and the fishing basket are sequentially connected to the bottom end of the setting central pipe, the ball seat and the ball are sleeved in the setting lower shear ring, a release pin is arranged between the ball seat and the setting lower shear ring, and a third pressure transmission hole is formed in the side wall of the fishing basket.

8. A downhole hanger and completion tool as defined in claim 3, wherein, The application further relates to a recovery tool, which comprises a recovery central pipe, a recovery cover sleeve and a recovery pawl, and the recovery cover sleeve and the recovery pawl are sequentially sleeved on the outer wall of the recovery central pipe.

9. A downhole hanger and completion tool as defined in claim 1, wherein, ​ 10. A downhole hanger and completion tool as defined in claim 1, wherein, ​

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