CO2-resistant multifunctional coiled tubing suspension sealing device
By designing a multi-functional continuous oil pipe suspension sealing device with a cutting continuous oil pipe and a variety of sealing structures, the problems of large joint tightening workload and many sealing points in traditional oil pipe suspension are solved, and the effect of reducing workers' labor intensity and improving safety is achieved.
Patent Information
- Application Number
- CN202311646205.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-04
- Publication Date
- 2025-06-06
AI Technical Summary
During the oil field gas injection and production process, when using ordinary oil pipe suspensions in traditional underground operations, a large number of joint tightening workloads and sealing points are required, resulting in high labor intensity and high safety risks for workers.
A CO2-resistant multifunctional continuous oil pipe suspension sealing device is designed. Through an integral joint-free continuous oil pipe with a length that can be cut at will, combined with a variety of sealing structures such as S-rings, O-rings, fillers, etc., it can achieve suspension and sealing without tightening the joints.
It effectively reduces the working intensity and number of contact sealing points of oil field workers, improves the safety of underground operations, and saves costs.
Smart Images
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Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of oil and gas production engineering, and specifically relates to a CO 2 Multifunctional coiled tubing suspension sealing device. Background Art
[0002] In the process of oilfield injection and gas production, conventional downhole operations can only use ordinary tubing when using ordinary tubing hangers. Since the length of ordinary tubing is between 9 and 10 meters, if the well depth is 2,000 meters, about 200 tubing connections are required, which requires 200 tightening workloads and 200 sealing points. This reduces the tightening workload and sealing points of joints, reduces the work intensity of oilfield workers, and increases safety.
[0003] When using ordinary tubing hangers, the tubing threads are mainly used for connection, which places high installation requirements on on-site workers. The torque when tightening the threads must meet standard specifications. If the torque does not meet the specifications, it may cause leakage in the sealing part of the tubing joint. In the actual production process, the labor intensity of workers who repeatedly tighten the tubing is high. Summary of the invention
[0004] In order to overcome the shortcomings of the prior art, the present invention provides a CO 2 The multifunctional coiled tubing hanging and sealing device can be cut to any length according to the well depth, and is an integral jointless coiled tubing. It can eliminate the need for ordinary tubing hangers to be used at the wellheads of oilfield gas production and injection, reduce the workload of joint tightening and sealing points during downhole operations, reduce the workload of oilfield workers and increase the safety factor of operations.
[0005] The above object of the present invention is achieved through the following technical solutions: a CO resistant 2 A multifunctional continuous tubing suspension sealing device comprises a body, a slip, a positioning ring, a hexagon socket head screw, an S sealing ring, a lower stop ring, a rectangular ring, a sealing box, a stuffing pad, a stuffing, an O-ring and a stuffing pressure cap, wherein the stuffing pressure cap, the stuffing, the stuffing pad, the sealing box, the rectangular ring, the lower stop ring and the slip are covered on the continuous tubing from top to bottom in order; the body is covered on the outside of the sealing box, the rectangular ring, the lower stop ring and the slip; the positioning ring is arranged on the upper part of the slip and is locked with a hexagon socket head screw; the S sealing ring is arranged on the outside of the body; and the O-ring is arranged on the outside of the sealing box.
[0006] Furthermore, the body is a metal hollow column, the outer wall of the body has six 60° evenly distributed through elliptical holes, the inner wall of the body has three steps of different diameters and a 7° tapered hole.
[0007] Furthermore, the slip is a metal cutting part with a tapered shape and a rectangular annular groove. The inner wall of the slip is serrated. The end face of the slip is cut vertically into 4 pieces, and 4 screw holes are respectively provided on the end faces of the 4 slips.
[0008] Furthermore, the positioning ring is a metal ring cut into two halves and internal threads are processed on both sides.
[0009] Furthermore, the S sealing ring is an annular non-metallic sealing ring.
[0010] Furthermore, the lower retaining ring is a circular metal ring with a hole, the outer shape of which has a step with a 45° slope, and the end face has two blind hole internal threads.
[0011] Furthermore, the rectangular ring is a customized annular rectangular non-metallic sealing ring.
[0012] Furthermore, the sealing box is in the shape of a metal hollow column, the inner wall of the sealing box has two steps of different diameters and an internal thread at the top, and the outer wall has two square ring grooves and one triangular ring groove.
[0013] Furthermore, the packing pad is a metal annular flat pad; the packing is a customized annular rectangular non-metallic sealing ring.
[0014] Furthermore, the O-ring is an annular O-shaped non-metallic sealing ring, the packing cap is a metal hollow cylinder, a smooth cylinder is processed at both ends of the outer wall, an external thread is processed in the middle, two holes of different diameters are processed on the inner wall, and there are 4 square grooves at 90° on the end face.
[0015] Compared with the prior art, the invention has the following beneficial effects: the coiled tubing hanger used in the patented gas injection wellhead can eliminate the need for using ordinary tubing hangers in oilfield gas production and gas injection wellheads, reduce the workload of joint tightening and sealing points during downhole operations, reduce the work intensity of oilfield workers and increase the safety factor of operations. The invention has been applied to the construction and suspension of coiled tubing in gas injection wells, realizing the suspension of coiled tubing wellheads, and has been promoted and applied to 8 wells in the Heilongjiang 125 gas injection block, saving costs of 4.8 million yuan. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0017] Figure 1 The present invention is resistant to CO 2 Schematic diagram of the structure of the multifunctional coiled tubing suspension sealing device;
[0018] Figure 2 The present invention is resistant to CO 2 Schematic diagram of the slip structure of the multifunctional coiled tubing suspension sealing device;
[0019] Figure 3 The present invention is resistant to CO 2 Schematic diagram of the main structure of the multifunctional continuous tubing suspension sealing device.
[0020] In the figure, 1. body; 2. slip; 3. positioning ring; 4. hexagon socket head screw; 5. S sealing ring; 6. lower stop ring; 7. rectangular ring; 8. sealing box; 9. packing pad; 10. packing; 11. O-ring; 12. packing pressure cap; 13. continuous oil pipe. DETAILED DESCRIPTION
[0021] The present invention is described in detail below by specific examples, but the protection scope of the present invention is not limited. Unless otherwise specified, the experimental methods used in the present invention are all conventional methods, and the experimental equipment, materials, reagents, etc. used can be obtained from commercial channels.
[0022] Example 1
[0023] A CO resistant 2 The multifunctional coiled tubing suspension sealing device comprises a body 1, a slip 2, a positioning ring 3, a hexagon socket head screw 4, an S sealing ring 5, a lower stop ring 6, a rectangular ring 7, a sealing box 8, a packing pad 9, a packing 10, an O-ring 11, and a packing pressure cap 12, wherein the packing pressure cap 12, the packing 10, the packing pad 9, the sealing box 8, the rectangular ring 7, the lower stop ring 6, and the slip 2 are covered on the coiled tubing 13 from top to bottom, and the body 1 is covered on the sealing box 8, the rectangular ring 7, the lower stop ring 6. Outside the slip 2, the positioning ring 3 is arranged on the upper part of the slip 2 and is locked with a hexagon socket head screw 4, the S sealing ring 5 is arranged on the outside of the body 1, and the O-ring 11 is arranged on the outside of the sealing box 8; the body 1 is a metal hollow column, the outer wall of the body 1 has six 60° uniformly distributed through elliptical holes, the inner wall of the body 1 has three steps of different diameters and a 7° tapered hole; the slip 2 is a metal cutting part, the outer shape has a taper, a rectangular ring groove, the inner wall of the slip 2 is a sawtooth shape, and the end face of the slip 2 It is cut into 4 pieces vertically in the center, and 4 screw holes are respectively provided on the end faces of the 4 slips 2; the positioning ring 3 is a metal ring cut into two halves and internal threads are processed on both sides; the S sealing ring 5 is a customized annular non-metallic sealing ring; the lower stop ring 6 is a circular metal ring with a hole, the outer shape has a step with a 45° slope, and the end face has 2 blind hole internal threads; the rectangular ring 7 is a customized annular rectangular non-metallic sealing ring; the sealing box 8 is a metal hollow column, the inner wall of the sealing box 8 has two steps of different diameters and an internal thread on the upper part, and the outer wall has two square ring grooves and a triangular ring groove; the packing pad 9 is a metal annular flat pad; the packing 10 is an annular rectangular non-metallic sealing ring; the O-ring 11 is an annular O-shaped non-metallic sealing ring, the packing pressure cap 12 is a metal hollow column, a section of smooth cylinder is processed at both ends of the outer wall, an external thread is processed in the middle, two holes of different diameters are processed on the inner wall, and the end face has 4 square grooves at 90°.
[0024] The above-described embodiments are only preferred embodiments of the present invention, but not all feasible embodiments of the present invention. For those skilled in the art, any obvious changes made thereto without departing from the principles and spirit of the present invention should be considered to be included in the scope of protection of the claims of the present invention.
Claims
1. A CO2-resistant 2 Multifunctional coiled tubing suspension sealing device, It is characterized in that The invention comprises a body (1), a slip (2), a positioning ring (3), a hexagon socket head screw (4), an S sealing ring (5), a lower stop ring (6), a rectangular ring (7), a sealing box (8), a packing pad (9), a packing (10), an O-ring (11), and a packing pressure cap (12), wherein the packing pressure cap (12), the packing (10), the packing pad (9), the sealing box (8), the rectangular ring (7), the lower stop ring (6), and the slip (2) are covered on the coiled tubing (13) from top to bottom in order; the body (1) is covered on the outside of the sealing box (8), the rectangular ring (7), the lower stop ring (6), and the slip (2); the positioning ring (3) is arranged on the upper part of the slip (2) and is provided with a hexagon socket head screw (4) for locking; the S sealing ring (5) is arranged on the outside of the body (1), and the O-ring (11) is arranged on the outside of the sealing box (8).
2. The CO resistant compound according to claim 1 2 Multifunctional coiled tubing suspension sealing device, It is characterized in that The body (1) is in the shape of a metal hollow column. The outer wall of the body (1) has six 60° evenly spaced through elliptical holes, and the inner wall of the body (1) has three steps of different diameters and a 7° conical hole.
3. The CO resistant compound according to claim 1 2 Multifunctional coiled tubing suspension sealing device, It is characterized in that The slip (2) is a metal cutting part with a tapered outer shape and a rectangular annular groove. The inner wall of the slip (2) is in a sawtooth shape. The end face of the slip (2) is cut into four pieces vertically in the center, and four screw holes are respectively provided on the end faces of the four slips (2).
4. The CO resistant compound according to claim 1 2 Multifunctional coiled tubing suspension sealing device, It is characterized in that The positioning ring (3) is a metal ring cut into two halves and internal threads are processed on both sides.
5. The CO resistant compound according to claim 1 2 Multifunctional coiled tubing suspension sealing device, It is characterized in that The S sealing ring (5) is a customized annular non-metallic sealing ring.
6. The CO resistant compound according to claim 1 2 Multifunctional coiled tubing suspension sealing device, It is characterized in that The lower stop ring (6) is a circular metal ring with a hole, the outer shape of which has a step with a 45° slope, and the end face has two blind hole internal threads.
7. The CO resistant compound according to claim 1 2 Multifunctional coiled tubing suspension sealing device, It is characterized in that The rectangular ring (7) is a customized annular rectangular non-metallic sealing ring.
8. The CO resistant compound according to claim 1 2 Multifunctional coiled tubing suspension sealing device, It is characterized in that The sealing box (8) is in the shape of a metal hollow column. The inner wall of the sealing box (8) has two steps of different diameters and an internal thread at the top, and the outer wall has two square ring grooves and one triangular ring groove.
9. The CO resistant compound according to claim 1 2 Multifunctional coiled tubing suspension sealing device, It is characterized in that The packing pad (9) is a metal annular flat pad; the packing (10) is an annular rectangular non-metallic sealing ring.
10. The CO resistant compound according to claim 1 2 Multifunctional coiled tubing suspension sealing device, It is characterized in that The O-ring (11) is an annular O-shaped non-metallic sealing ring, and the packing cap (12) is a metal hollow column, with a smooth cylindrical section processed at both ends of the outer wall, an external thread processed in the middle, two holes of different diameters processed on the inner wall, and four square grooves at 90 degrees on the end face.