Well plugging device core picking device

Abstract

The utility model relates to a blowout preventer core picking device, and relates to the technical field of well drilling. The blowout preventer core picking device comprises an inner pipe, an outer pipe, an upper connector, a lower connector, a lantern ring and an inhaul cable, one end of the inner pipe is arranged in the outer pipe and can move in the outer pipe, the upper connector is arranged at the other end of the inner pipe and located outside the outer pipe, and the lower connector is arranged at the end, away from the upper connector, of the outer pipe and can move in the outer pipe. The two ends of the inhaul cable are connected with the lantern ring and the lower connector respectively, the lantern ring comprises two semicircular rings and two fasteners, and the two semicircular rings are connected through the two fasteners. The upper connector is in threaded connection with the lower portion of a pipe column with a blowout preventer core, the lower connector is in threaded connection with a wellhead pipe column, after the lantern ring is installed on the upper portion of the blowout preventer core, the pipe column with the blowout preventer core is slowly lifted upwards, the inner pipe moves upwards, the lantern ring is pulled by the inhaul cable and cannot move upwards along with the lantern ring, and therefore the blowout preventer core is pulled down from the pipe column to the outside of the inner pipe. The working efficiency is improved; the labor intensity is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of drilling, and particularly relates to a device for removing a blowout preventer core. Background Art

[0002] The blowout preventer core is a tool used in conjunction with a rotary blowout preventer and is an important wellhead device in oilfield workover operations. Its function is to seal the annular space between the tubing and the casing, establish a workover fluid circulation channel, withstand a certain pressure, and complete operations such as sand washing, milling, grinding, and drilling. Since the core can withstand a certain pressure, has good sealing performance, and is made of relatively hard material, its inner diameter is slightly smaller than the outer diameter of the pipe string. When pulling out the pipe string after the construction is completed, due to its inner diameter being slightly smaller than the outer diameter of the pipe string and tightly adhering to the outer wall of the pipe string, it cannot pass through the pipe string coupling with a larger outer diameter and hangs on the pipe string. Currently, the removal of the blowout preventer core still adopts the method of manual hammering, which takes a long time and has a large labor intensity.

[0003] Although the Chinese patent with the publication number CN204195677U discloses a tool for removing a rotary self-sealing core, which can quickly remove the self-sealing core in a rotary self-sealing blowout preventer. However, the above patent is applicable to removing the core from a rotary self-sealing blowout preventer and is not applicable to removing the core of a rotary self-sealing blowout preventer from the pipe string. Summary of the Utility Model

[0004] The utility model provides a device for removing a blowout preventer core, which can conveniently remove the blowout preventer core from the work pipe string.

[0005] The utility model provides a device for removing a blowout preventer core, including an inner pipe, an outer pipe, an upper joint, a lower joint, a collar, and a cable. One end of the inner pipe is arranged inside the outer pipe and can move inside the outer pipe. The upper joint is arranged at the other end of the inner pipe and is located outside the outer pipe. The lower joint is arranged at the end of the outer pipe far from the upper joint. The two ends of the cable are respectively connected to the collar and the lower joint. The collar includes two semi-circular rings and two fasteners, and the two semi-circular rings are connected by the two fasteners.

[0006] In one embodiment, a limit seat is provided at the end of the inner pipe far from the upper joint, the edge of the limit seat abuts against the inner wall of the outer pipe, and a retaining ring is provided on the inner wall of the outer pipe at the end far from the lower joint.

[0007] In one embodiment, an external thread is provided at the end of the inner pipe far from the upper joint, an internal thread is provided on the limit seat, and the inner pipe is threadedly connected to the limit seat.

[0008] In one embodiment, two first connecting rings are provided on the surface of the lower joint, a second connecting ring is provided on the semicircular ring, and two ends of the cable are respectively connected to the first connecting ring and the second connecting ring.

[0009] In one embodiment, two of the first connecting rings are arranged on the lower joint at an interval of 180 degrees.

[0010] In one embodiment, the second connecting ring is arranged in the middle of the semicircular ring.

[0011] In one embodiment, the inner diameter of the collar is smaller than the outer diameter of the well plug core.

[0012] In one embodiment, the outer tube is threadedly connected to the lower joint.

[0013] In one embodiment, the fastener is a bolt, and the two ends of the semicircular ring are respectively provided with a first connecting seat and a second connecting seat, the first connecting seat is provided with a through hole, and the second connecting seat is provided with a threaded hole, and the fastener passes through the through hole and is screwed into the threaded hole.

[0014] In one embodiment, the cable is a steel wire rope.

[0015] Compared with the prior art, the utility model has the advantages that the operating pipe string brings the well sealer core up to the wellhead, the pipe string with the well sealer core is removed from the wellhead pipe string, the upper joint is threadedly connected to the lower part of the pipe string with the well sealer core, the lower joint is threadedly connected to the wellhead pipe string, the collar is installed on the upper part of the well sealer core, the pipe string with the well sealer core is slowly lifted up, the inner tube is moved up, and the collar is pulled by the cable and cannot move up with it, so that the well sealer core is pulled down from the pipe string to the outside of the inner tube. After that, the collar is removed, the upper joint and the lower joint are removed, and the inner tube is pulled out from the top of the outer tube, and the well sealer core can be removed. It avoids the use of manual hammering to remove the well sealer core, improves work efficiency and reduces labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0017] Figure 1 It is a structural schematic diagram of a well plugging core removing device in an embodiment of the utility model;

[0018] Figure 2 It is a schematic diagram of the top view of the semicircular ring in the embodiment of the utility model;

[0019] Figure 3 It is a side view structural schematic diagram of a semicircular ring in an embodiment of the utility model.

[0020] Reference numerals:

[0021] 1. Inner tube; 2. Outer tube; 3. Upper joint; 4. Lower joint; 41. First connecting ring; 5. Collar; 51. Semi-circular ring; 52. Second connecting ring; 53. First connecting seat; 531. Through hole; 54. Second connecting seat; 541. Threaded hole; 6. Cable; 7. Fastener; 8. Limit seat; 9. Retaining ring. Detailed implementation manners

[0022] The present utility model will be further described below in conjunction with the accompanying drawings.

[0023] As Figure 1 shown, the device for extracting the wellhead plug core of an embodiment of the present utility model includes an inner tube 1, an outer tube 2, an upper joint 3, a lower joint 4, a collar 5 and a cable 6. One end of the inner tube 1 is arranged inside the outer tube 2 and can move inside the outer tube 2. The upper joint 3 is arranged at the other end of the inner tube 1 and is located outside the outer tube 2. The lower joint 4 is arranged at one end of the outer tube 2 far from the upper joint 3. Two ends of the cable 6 are respectively connected to the collar 5 and the lower joint 4. The collar 5 includes two semi-circular rings 51 and two fasteners 7. The two semi-circular rings 51 are connected by the two fasteners 7.

[0024] The work string is lifted to the wellhead with the wellhead plug core. The string with the wellhead plug core is disconnected from the wellhead string. The upper joint 3 is threadedly connected to the lower part of the string with the wellhead plug core. The lower joint 4 is threadedly connected to the wellhead string. The two semi-circular rings 51 are assembled into a collar 5 through the two fasteners 7, so that the collar 5 is installed on the upper part of the wellhead plug core. The string with the wellhead plug core is slowly lifted, so that the inner tube 1 moves upward. The collar 5 is pulled by the cable 6 and cannot move upward accordingly, so as to pull the wellhead plug core from the string to the outside of the inner tube 1. Then the collar 5 is removed, the upper joint 3 and the lower joint 4 are disconnected, and the inner tube 1 is drawn out from above the outer tube 2, and the wellhead plug core can be taken off. The device for extracting the wellhead plug core of this embodiment avoids the method of manually hammering to extract the wellhead plug core, improves the work efficiency and reduces the labor intensity.

[0025] Further, a limit seat 8 is arranged at one end of the inner tube 1 far from the upper joint 3. The edge of the limit seat 8 abuts against the inner wall of the outer tube 2. A retaining ring 9 is arranged on the inner wall of one end of the outer tube 2 far from the lower joint 4. The limit seat 8 and the retaining ring 9 cooperate to prevent the inner tube 1 and the outer tube 2 from separating during the operation. Since the edge of the limit seat 8 abuts against the inner wall of the outer tube 2, it can play a certain guiding role, so that the inner tube 1 will not shake significantly when moving.

[0026] In order to further improve the stability of the inner tube 1 when moving, in this embodiment, the retaining ring 9 also abuts against the surface of the inner tube 1. In order to reduce the friction between the retaining ring 9 and the inner tube 1, the contact surface between the retaining ring 9 and the inner tube 1 can be set as an arc surface.

[0027] In addition, the limit seat 8 can also prevent objects from falling into the downhole string at the wellhead. After the blowout preventer core moves from the string to the inner pipe 1, the joint 4 needs to be disassembled first, and then the limit seat 8 is removed before the inner pipe 1 can be pulled out of the outer pipe 2 to remove the blowout preventer core from the inner pipe 1.

[0028] Furthermore, the end of the inner pipe 1 away from the upper joint 3 is provided with an external thread, and the limit seat 8 is provided with an internal thread. The inner pipe 1 is threadedly connected to the limit seat 8, enabling the limit seat 8 to be quickly installed and disassembled, thus improving the operation efficiency.

[0029] As Figure 1 and Figure 2 shown, two first connection rings 41 are provided on the surface of the lower joint 4, a second connection ring 52 is provided on the semi-circular ring 51, and both ends of the cable 6 are respectively connected to the first connection ring 41 and the second connection ring 52. By providing the first connection ring 41 and the second connection ring 52, both ends of the cable 6 can be conveniently fixed, ensuring the stability of the connection and preventing loosening after the cable 6 is tightened.

[0030] Furthermore, the two first connection rings 41 are arranged on the lower joint 4 with an interval of 180 degrees. After the two cables 6 are tightened, they can both remain vertical, and the cables 6 will not generate a deflecting moment on the lower joint 4, which is beneficial to maintaining the stability of the blowout preventer core removal device.

[0031] Correspondingly, the second connection ring 52 is arranged in the middle of the semi-circular ring 51.

[0032] In this embodiment, the inner diameter of the collar 5 is smaller than the outer diameter of the blowout preventer core. After the cable 6 is tightened, the collar 5 will not slip off the blowout preventer core. Therefore, the collar 5 also needs to be designed as two detachable semi-circular rings 51 so that the collar 5 can be smoothly arranged on the blowout preventer core.

[0033] In this embodiment, the outer pipe 2 is threadedly connected to the lower joint 4 to facilitate the installation and disassembly of the lower joint 4 and improve the operation efficiency.

[0034] In this embodiment set, the fastener 7 is a bolt. As Figure 2 and Figure 3 shown, the two ends of the semi-circular ring 51 are respectively provided with a first connection seat 53 and a second connection seat 54. A through hole 531 is provided on the first connection seat 53, and a threaded hole 541 is provided on the second connection seat 54. The fastener 7 passes through the through hole 531 and is screwed into the threaded hole 541. The first connection seat 53 on one semi-circular ring 51 is connected to the second connection seat 54 on the other semi-circular ring 51. By simply screwing the fastener 7, the installation and disassembly of the collar 5 can be achieved, and the operation is very simple.

[0035] In this embodiment, the cable 6 is a steel wire rope, which can withstand a large tensile force and ensure that it does not break during operation.

[0036] Although the present utility model has been described with reference to the preferred embodiments, various modifications can be made thereto and components thereof can be replaced with equivalents without departing from the scope of the present utility model. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present utility model is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A well plug core removal device, characterized in that: It includes an inner tube, an outer tube, an upper joint, a lower joint, a collar and a cable. One end of the inner tube is arranged inside the outer tube and can move inside the outer tube. The upper joint is arranged at the other end of the inner tube and is located outside the outer tube. The lower joint is arranged at one end of the outer tube away from the upper joint. Both ends of the cable are respectively connected to the collar and the lower joint. The collar includes two semicircular rings and two fasteners. The two semicircular rings are connected by the two fasteners.

2. The well plug core removal device according to claim 1, characterized in that: A limiting seat is provided at one end of the inner tube away from the upper joint, the edge of the limiting seat abuts against the inner wall of the outer tube, and a retaining ring is provided on the inner wall of one end of the outer tube away from the lower joint.

3. The well plug core removal device according to claim 2, characterized in that: An end of the inner tube away from the upper joint is provided with an external thread, the limiting seat is provided with an internal thread, and the inner tube is threadedly connected to the limiting seat.

4. The well plug core removal device according to claim 1, characterized in that: Two first connecting rings are arranged on the surface of the lower joint, a second connecting ring is arranged on the semicircular ring, and two ends of the cable are respectively connected to the first connecting ring and the second connecting ring.

5. The well plug core removal device according to claim 4, characterized in that: The two first connecting rings are arranged on the lower joint at an interval of 180 degrees.

6. The well plug core removal device according to claim 5, characterized in that: The second connecting ring is arranged in the middle of the semicircular ring.

7. The well plug core removal device according to claim 1, characterized in that: The inner diameter of the sleeve ring is smaller than the outer diameter of the well plug core.

8. The well plug core removal device according to claim 1, characterized in that: The outer tube is threadedly connected to the lower joint.

9. The well plug core removal device according to claim 1, characterized in that: The fastener is a bolt, and the two ends of the semicircular ring are respectively provided with a first connecting seat and a second connecting seat, the first connecting seat is provided with a through hole, and the second connecting seat is provided with a threaded hole, and the fastener passes through the through hole and is screwed into the threaded hole.

10. The well plug core removal device according to claim 1, characterized in that: The pull cable is a steel wire rope.

Images