A sealed overshot for fishing coiled tubing

Abstract

The utility model discloses a kind of sealing fishing barrel for fishing coiled tubing, including barrel, the tail of barrel is equipped with detachable upper joint, the head of barrel is equipped with detachable leading shoe, the joint of barrel and leading shoe is equipped with stop ring, the inner wall of barrel is equipped with wide sawtooth internal thread, the wide sawtooth internal thread is equipped with spiral slip, the leading shoe is equipped with sealing ring and compression ring.This sealing fishing barrel for fishing coiled tubing is reasonable in structure, convenient to operate, can be grabbed, trimmed fish head and sealed fish, etc. Operation, realize trimming coiled tubing fish head fly edge break and high pressure circulation, fish can also be released, the effect is obvious, and the practicality is strong.

Description

Technical Field

[0001] This utility model relates to a retrieval cylinder, or more precisely, a sealed retrieval cylinder for retrieving coiled tubing. Background Technology

[0002] A retrieval tube is a commonly used tool in oil drilling and well workover operations, primarily used for retrieving objects that have fallen into the well. Existing retrieval tubes generally only allow for retrieval and cannot achieve sealing; after retrieval, the well-washing fluid can only reach the bottom of the tool and cannot be transferred to the very bottom where the object fell. Utility Model Content

[0003] Therefore, it is necessary to provide a sealed retrieval cylinder for retrieving coiled tubing to address the aforementioned technical problems.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A sealed retrieval cylinder for retrieving coiled tubing, characterized in that the sealed retrieval cylinder comprises a cylinder body, a detachable upper connector at the tail end of the cylinder body, a detachable guide shoe at the head end of the cylinder body, a stop ring at the junction of the cylinder body and the guide shoe, a wide sawtooth internal thread on the inner wall of the cylinder body, a spiral slip on the wide sawtooth internal thread, and a sealing ring and a clamping ring inside the guide shoe.

[0005] In a preferred embodiment of the present invention, the guide shoe includes a cylindrical guide shoe tube, the head of the guide shoe tube is provided with a slope, the interior of the guide shoe tube is provided with a first limiting step and a second limiting step, the sealing ring cooperates with the first limiting step, the pressing ring cooperates with the second limiting step, and a sealing ring is provided on the inner wall of the sealing ring.

[0006] In a preferred embodiment of the present invention, the inner wall of the sealing ring is provided with a plurality of annular grooves, and the outer wall of the sealing ring is provided with a plurality of annular protrusions, the protrusions cooperating with the grooves.

[0007] In a preferred embodiment of this utility model, the sealing ring is made of high-temperature resistant vulcanized sealing rubber.

[0008] In a preferred embodiment of the present invention, the end face of the clamping ring is provided with a 30° chamfer.

[0009] In a preferred embodiment of this utility model, the ramp is set at a right-handed inward rotation of 9°.

[0010] In a preferred embodiment of this utility model, the upper connector is threadedly connected to the cylinder, and the guide shoe is threadedly connected to the cylinder.

[0011] Compared with the prior art, the present invention has the following beneficial effects: This utility model provides a sealed retrieval cylinder for retrieving coiled tubing. The sealed retrieval cylinder for retrieving coiled tubing has a reasonable structure and is easy to operate. It can perform operations such as grabbing, trimming the fish head, and sealing the fallen fish. It can also trim the broken edges of the coiled tubing fish head and perform high-pressure circulation, and can also release the fallen fish. The effect is obvious and the practicality is strong. Attached Figure Description

[0012] To more clearly illustrate the solutions in this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0013] Figure 1 This is a three-dimensional structural diagram of the sealed retrieval cylinder for retrieving coiled tubing according to the present invention. Figure 2 for Figure 1 A three-dimensional structural diagram of the sealed retrieval cylinder used for salvaging coiled tubing, shown from another perspective; Figure 3 for Figure 2 A cross-sectional view of the sealed scoop cylinder along line AA; Figure 4 for Figure 3 A magnified view of the details of region A in the diagram; Figure 5 for Figure 3 A three-dimensional structural diagram of the guide shoe of the sealed retrieval cylinder used for salvaging coiled tubing; Figure 6 for Figure 5 A cross-sectional view of the shoe along the BB line; Figure 7 for Figure 4 A three-dimensional structural diagram of the sealing ring in the middle; Figure 8 for Figure 7 A cross-sectional view of the sealing ring along the CC line; Figure 9 for Figure 4 A three-dimensional structural diagram of the sealing ring in the image; Figure 10 for Figure 9 A cross-sectional view of the sealing ring along line DD in the middle; The markings in the diagram are explained as follows: 1. Sealing cylinder; 2. Upper connector; 3. Cylinder body; 31. Wide sawtooth internal thread; 32. Spiral slip; 4. Guide shoe; 40. Guide shoe cylinder; 41. First limiting step; 42. Second limiting step; 411. Ramp; 5. Stop ring; 6. Sealing ring; 61. Groove; 7. Pressing ring; 71. Chamfered surface; 8. Sealing ring; 81. Protrusion. Detailed Implementation

[0014] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0015] like Figures 1 to 4 As shown, the sealing retrieval cylinder 1 for retrieving coiled tubing includes a cylinder body 3. The tail of the cylinder body 3 is provided with a detachable upper connector 2, and the head of the cylinder body 3 is provided with a detachable guide shoe 4. A stop ring 5 is provided at the junction of the cylinder body 3 and the guide shoe 4. A wide sawtooth internal thread 31 is provided on the inner wall of the cylinder body 3, and a spiral slip 32 is provided on the wide sawtooth internal thread 31. A sealing ring 6 and a clamping ring 7 are provided inside the guide shoe 4.

[0016] It should be noted that the end face of the clamping ring 7 has a 30° chamfered surface 71.

[0017] like Figure 5 and Figure 6 As shown, the shoe guide 4 includes a cylindrical shoe guide tube 40. The head of the shoe guide tube 40 is provided with a ramp 411, which is set at a right-hand inward rotation of 9°. The inside of the shoe guide tube 40 is provided with a first limiting step 41 and a second limiting step 42. The sealing ring 6 cooperates with the first limiting step 41, and the pressing ring 7 cooperates with the second limiting step 42. A sealing ring 8 is provided on the inner wall of the sealing ring 6.

[0018] like Figures 7 to 10 As shown, the inner wall of the sealing ring 6 is provided with several annular grooves 61, and the outer wall of the sealing ring 8 is provided with several annular protrusions 81, which cooperate with the grooves 61.

[0019] It should be noted that the upper connector 2 is connected to the cylinder 3 by a thread, and the guide shoe 4 is connected to the cylinder 3 by a thread.

[0020] In addition, the sealing ring 8 is made of high-temperature resistant vulcanized sealing rubber.

[0021] The following describes the working method of the sealed retrieval cylinder used for salvaging coiled tubing, including the steps: Step S1: Using the ramp 411 at the head of the guide shoe tube 40, the fish in the continuous tubing in the well enters the guide shoe 4 through the ramp 411. Step S2: After the continuous oil pipe for retrieving the fallen fish enters the guide shoe 4, it enters the interior of the sealing ring 8 along the chamfered surface 71 of the clamping ring 7. Step S3: Continue pressurizing and lowering the tubing string. The top of the coiled tubing enters the cylinder 3 and enters the spiral slip 32 for retrieval. At this time, the coiled tubing body at the lower end of the top of the fish and the sealing ring 8 form a seal. Step S4: When pumping is required, pump the medium from the retrieval string. Under the action of the sealing ring 8, the Φ29mm cutting tool or testing tool can be pumped to the predetermined position.

[0022] The sealed retrieval cylinder used for retrieving coiled tubing has a reasonable structure and is easy to operate. It can perform operations such as grabbing, trimming the fish head, and sealing the fallen fish. It can also trim the broken edges of the coiled tubing fish head and perform high-pressure circulation. It can also release the fallen fish. The effect is obvious and the practicality is strong.

[0023] Obviously, the embodiments described above are only some embodiments of this application, and not all embodiments. The accompanying drawings show preferred embodiments of this application, but do not limit the patent scope of this application.

Claims

1. A sealed retrieval cylinder for retrieving coiled tubing, characterized in that, The sealing retrieval cylinder (1) for retrieving coiled tubing includes a cylinder body (3), the tail of the cylinder body (3) is provided with a detachable upper connector (2), the head of the cylinder body (3) is provided with a detachable guide shoe (4), a stop ring (5) is provided at the junction of the cylinder body (3) and the guide shoe (4), a wide sawtooth internal thread (31) is provided on the inner wall of the cylinder body (3), a spiral slip (32) is provided on the wide sawtooth internal thread (31), and a sealing ring (6) and a clamping ring (7) are provided inside the guide shoe (4).

2. The sealed retrieval cylinder for retrieving coiled tubing according to claim 1, characterized in that, The shoe guide (4) includes a cylindrical shoe guide tube (40), the head of the shoe guide tube (40) is provided with a ramp (411), the inside of the shoe guide tube (40) is provided with a first limiting step (41) and a second limiting step (42), the sealing ring (6) cooperates with the first limiting step (41), the pressing ring (7) cooperates with the second limiting step (42), and the inner wall of the sealing ring (6) is provided with a sealing ring (8).

3. The sealed retrieval cylinder for retrieving coiled tubing according to claim 2, characterized in that, The inner wall of the sealing ring (6) is provided with several annular grooves (61), and the outer wall of the sealing ring (8) is provided with several annular protrusions (81), which cooperate with the grooves (61).

4. The sealed retrieval cylinder for retrieving coiled tubing according to claim 3, characterized in that, The sealing ring (8) is made of high-temperature resistant vulcanized sealing rubber.

5. The sealed retrieval cylinder for retrieving coiled tubing according to claim 1, characterized in that, The end face of the clamping ring (7) is provided with a 30° chamfered surface (71).

6. The sealed retrieval cylinder for retrieving coiled tubing according to claim 2, characterized in that, The slope (411) is set at a right-handed inward rotation of 9°.

7. The sealed retrieval cylinder for retrieving coiled tubing according to claim 1, characterized in that, The upper connector (2) is connected to the cylinder (3) by a thread, and the guide shoe (4) is connected to the cylinder (3) by a thread.

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