Oil pipe buckling connector

Abstract

The utility model discloses an oil pipe buckling connector, which belongs to the technical field of workover treatment and comprises an upper oil pipe and an in-well oil pipe body, the in-well oil pipe body is positioned inside an oil well, the upper oil pipe is positioned above the in-well oil pipe body, an outer cylinder is mounted on the outer side of the upper oil pipe, and a fastening screw hole is formed in the surface of the outer cylinder. The inner portion of the outer cylinder is provided with an outer cylinder inner conical surface, the bottom of the outer cylinder is provided with a transition joint, the top of the transition joint is provided with an adjusting copper ring, the top of the adjusting copper ring is provided with a split type split slip, and the split type split slip is located in the inner conical surface of the outer cylinder. And a protection cylinder is mounted at the bottom of the transition joint. According to the utility model, the oil pipe left in the well and the coupling are introduced into the protection cylinder and are centered, and forward torque is applied through the turntable, so that the male buckle of the upper oil pipe is buckled with the screw thread of the coupling of the oil pipe left in the well, the buckling operation can be completed without multiple trials, and the buckling efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of workover operations, in particular to a tubing coupling connector. Background Technique

[0002] When conducting pressure-bearing construction operations in oil and gas fields, it is necessary to remove the original well tubing under pressure. The tubing coupling connector is used for coupling connection of the remaining tubing in the well. It is a thread coupling tool that can be docked with the upper tubing without removing the remaining tubing in the well, thereby restoring the production function or performing other workover operations.

[0003] When the applicant applied for the present utility model, after retrieval, it was found that a Chinese utility model patent disclosed a pressure-bearing operation tubing coupling device (application number: CN201921619132.7). This Chinese utility model patent includes a coupling joint. The upper end of the coupling joint is the upper tubing connection end, and the lower end is the lower tubing connection end. A centering sleeve is sleeved on the coupling joint. The lower tubing connection end is inside the centering sleeve, and the upper tubing connection end is outside the centering sleeve. The centering sleeve includes a sleeve body fixed to the coupling joint and a plurality of centering spring arms evenly distributed along the circumference at the lower part of the sleeve body. The centering spring arms have a guiding section and a centering section. The centering section is on the upper side of the guiding section, and the centering section is below the lower tubing connection end in the axial direction of the coupling joint. Another Chinese utility model patent disclosed a tubing pressure-bearing coupling device (application number: CN201120060191.2). This Chinese utility model patent includes a plug cock, a coupling, a sliding sleeve, a sliding short joint, a gasket, a spring, an extension short joint, a coupling short joint, and a guide shoe. The plug cock is sequentially connected to the coupling, the sliding short joint, the coupling, the extension short joint, the coupling, the coupling short joint, and the guide shoe. The sliding sleeve, the gasket, and the spring are sequentially installed outside the sliding short joint.

[0004] However, the above-mentioned tubing coupling devices have relatively cumbersome operation procedures, require a long operation time, and have a large operation difficulty, which is not convenient for use. Summary of the Utility Model

[0005] The purpose of the present utility model is to solve the shortcomings existing in the prior art, and to propose a tubing coupling connector.

[0006] To achieve the above object, the utility model adopts the following technical solutions: A tubing coupling connector, including an upper tubing and a tubing body in the well. The tubing body in the well is located inside the oil well, and the upper tubing is located above the tubing body in the well. An outer cylinder is installed on the outer side of the upper tubing. A plurality of fastening screw holes are provided on the surface of the outer cylinder, and an internal hexagonal fastening screw is threadedly connected inside the fastening screw hole. The end of the internal hexagonal fastening screw is in contact with the outer surface of the upper tubing. An outer cylinder inner conical surface is provided inside the outer cylinder. A transition joint is installed at the bottom of the outer cylinder. An adjusting copper ring is provided at the top of the transition joint. A split split collet is provided at the top of the adjusting copper ring. The split split collet is located inside the outer cylinder inner conical surface. A protection cylinder is installed at the bottom of the transition joint. The protection cylinder is located above the tubing body in the well.

[0007] As a further description of the above technical solution:

[0008] An outer cylinder connection thread is provided at the bottom of the outer cylinder, and a transition joint upper connection thread is provided at the top of the transition joint. The outer cylinder connection thread is threadedly connected to the transition joint upper connection thread.

[0009] As a further description of the above technical solution:

[0010] A jackscrew annular groove is provided on the outer surface of the transition joint. A plurality of jackscrew holes are provided on the surface of the outer cylinder, and an internal hexagonal jackscrew is threadedly connected inside the jackscrew hole. The end of the internal hexagonal jackscrew is located inside the jackscrew annular groove.

[0011] As a further description of the above technical solution:

[0012] A transition joint double-stage trapezoidal thread is provided at the bottom of the transition joint, and a protection cylinder double-stage trapezoidal thread is provided at the top of the protection cylinder. The transition joint double-stage trapezoidal thread is threadedly connected to the protection cylinder double-stage trapezoidal thread.

[0013] As a further description of the above technical solution:

[0014] A male end of the upper tubing is provided at the bottom of the upper tubing, and a tubing collar of the tubing body in the well is provided at the top of the tubing body in the well. The male end of the upper tubing is directly above the tubing collar of the tubing body in the well.

[0015] As a further description of the above technical solution:

[0016] An outer cylinder guide shoe is provided at the top of the outer cylinder, and a lower guide shoe of the protection cylinder is provided at the bottom of the protection cylinder.

[0017] As a further description of the above technical solution:

[0018] The top of the split slip has an upper split slip surface, the inner surface of the split slip has a split slip engaging surface, and the bottom of the split slip has a lower split slip surface.

[0019] The utility model has the following beneficial effects:

[0020] Compared with the prior art, in the utility model, after the male end of the upper tubing is inserted into the top of the outer cylinder through the split slip, adjusting copper ring, transition joint and centralizer, the transition head is slowly screwed in, so that the split slip bites the body of the upper tubing, and then the hexagon socket head cap screw and hexagon socket head fastening screw are installed to fix the upper tubing and the transition joint respectively. Then the centralizer is screwed in, the lower tubing string is connected to the upper tubing and sent into the well. The tubing coupling connector is slowly rotated forward, the tubing collar in the well is introduced through the guide shoe at the lower end of the centralizer and centered, and finally the tubing coupling connector is continuously rotated slowly forward to guide the male end of the upper tubing to be mated with the tubing collar in the well to complete the connection. It can be seen that compared with the conventional tubing coupling device, when the lower tubing string is sent into the well with the tubing coupling connector in the utility model, the remaining tubing collar in the well is introduced through the centralizer and centered, and then a positive torque is applied through the rotary table, so that the male thread of the upper tubing is mated with the thread of the remaining tubing collar in the well. The coupling operation can be completed without multiple attempts, the process is simple, the operation time is short, the operation difficulty is small, it is convenient to use, and the coupling efficiency is improved. Description of the Drawings

[0021] Figure 1 is a schematic view of the overall structure of a tubing coupling connector proposed by the utility model from the first perspective;

[0022] Figure 2 is a schematic view of the overall structure of a tubing coupling connector proposed by the utility model from the second perspective;

[0023] Figure 3 is a cross-sectional view of the internal structure of a tubing coupling connector proposed by the utility model;

[0024] Figure 4 is a tubing coupling connector proposed by the utility model Figure 3 enlarged view of the structure at A;

[0025] Figure 5 is a tubing coupling connector proposed by the utility model Figure 3 enlarged view of the structure at B.

[0026] Legend:

[0027] 1. Upper tubing; 2. Outer barrel guide shoe; 3. Outer barrel; 4. Fastening screw hole; 5. Hexagon socket head cap screw; 6. Inner conical surface of outer barrel; 7. Split slip; 8. Adjusting copper ring; 9. Connecting thread of outer barrel; 10. Connecting thread of upper part of transition joint; 11. Circumferential groove for setscrew; 12. Setscrew hole; 13. Hexagon socket head setscrew; 14. Transition joint; 15. Double-stage trapezoidal thread of transition joint; 16. Double-stage trapezoidal thread of centralizer; 17. Centralizer; 18. Male end of upper tubing; 19. Tubing coupling in well; 20. Tubing body in well; 21. Guide shoe at lower end of centralizer; 22. Upper end face of split slip; 23. Biting surface of split slip; 24. Lower end face of split slip. Detailed implementation mode

[0028] Refer to Figures 1-5, a tubing coupling connector provided by the utility model: includes an upper tubing 1 and an in-well tubing body 20. The in-well tubing body 20 is located inside the oil well and is the tubing string left in the oil well. The upper tubing 1 is located above the in-well tubing body 20. The tubing coupling connector is internally loaded with the upper tubing 1, and the well tubing string is connected thereto. An outer cylinder 3 is installed on the outer side of the upper tubing 1. Fastening screw holes 4 are provided on the surface of the outer cylinder 3, and the number of the fastening screw holes 4 is multiple. An internal hexagonal fastening screw 5 is threadedly connected inside the fastening screw hole 4, and the end of the internal hexagonal fastening screw 5 is in contact with the outer surface of the upper tubing 1. There are 8 uniformly distributed fastening screw holes 4 on the outer cylinder 3 body, which are staggered by 45° in two layers, for installing the internal hexagonal fastening screw holes 5 to fix the upper tubing 1. An outer cylinder inner conical surface 6 is provided inside the outer cylinder 3 for installing a split clamping jaw 7. A transition joint 14 is installed at the bottom of the outer cylinder 3. An adjusting copper ring 8 is provided at the top of the transition joint 14. There are various thicknesses or options available for the adjusting copper ring 8 to adjust the gap between the transition joint 14 and the adjusting copper ring 8. After the connection thread 10 on the transition joint of the transition joint 14 is tightened, it can press the adjusting copper ring 8 against the split clamping jaw 7 to prevent it from retreating. A split clamping jaw 7 is provided at the top of the adjusting copper ring 8. A split clamping jaw upper end surface 22 is provided at the top of the split clamping jaw 7. A split clamping jaw engaging surface 23 is provided on the inner surface of the split clamping jaw 7. A split clamping jaw lower end surface 24 is provided at the bottom of the split clamping jaw 7. The split clamping jaw 7 is located inside the outer cylinder inner conical surface 6. The split clamping jaw 7 is divided into left and right pieces, with the outer side closely attached to the outer cylinder inner conical surface 6 and the inner side being the split clamping jaw engaging tooth surface 23, which is closely attached to the outer wall of the upper tubing 1. As the lifting force of the upper tubing 1 increases, the radial clamping force between the outer side of the split clamping jaw 7 and the outer cylinder inner conical surface 6 increases, causing the split clamping jaw engaging tooth surface 23 to bite into the outer wall of the upper tubing 1 to complete the engagement, for bearing the lifting force and transmitting the rotation torque. The split clamping jaw engaging tooth surface 23 has two types: serrated engaging teeth and fine-grained alloy teeth. According to the different materials of the upper tubing 1, the corresponding type of alloy teeth is selected. A protection cylinder 17 is installed at the bottom of the transition joint 14. The protection cylinder 17 is located above the in-well tubing body 20. A male end of the upper tubing 18 is provided at the bottom of the upper tubing 1. An in-well tubing collar 19 is provided at the top of the in-well tubing body 20. The male end of the upper tubing 18 is directly above the in-well tubing collar 19.

[0029] The bottom of the outer cylinder 3 is provided with an outer cylinder connecting thread 9, and the top of the adapter 14 is provided with an upper connecting thread 10 on the adapter. The outer cylinder connecting thread 9 is threadedly connected to the upper connecting thread 10 on the adapter. After the upper connecting thread 10 on the adapter 14 is tightened, it can press the adjusting copper ring 8 against the split slip 7 to prevent it from retreating. The bottom of the adapter 14 is provided with a double-stage trapezoidal thread 15 of the adapter, and the top of the alignment cylinder 17 is provided with a double-stage trapezoidal thread 16 of the alignment cylinder. The double-stage trapezoidal thread 15 of the adapter is threadedly connected to the double-stage trapezoidal thread 16 of the alignment cylinder, and the alignment cylinder 17 is fixedly connected by the double-stage trapezoidal thread 16 of the alignment cylinder and the double-stage trapezoidal thread 15 of the adapter.

[0030] The outer surface of the adapter 14 is provided with a setscrew annular groove 11, and the surface of the outer cylinder 3 is provided with setscrew holes 12, and the number of setscrew holes 12 is multiple. An internal hexagonal setscrew 13 is threadedly connected inside the setscrew hole 12, and the end of the internal hexagonal setscrew 13 is located inside the setscrew annular groove 11. The roots of the outer cylinder connecting threads 9 are 4 setscrew holes 12 evenly distributed on the same plane for installing the internal hexagonal setscrews 13, and the bottom of the internal hexagonal setscrews 13 is pushed into the setscrew annular groove 11 in the middle of the adapter 14, so that the adapter 14 and the outer cylinder 3 can be adjusted within a fine range, and the outer cylinder connecting thread 9 and the upper connecting thread 10 on the adapter can still maintain the connection state without unthreading.

[0031] The top of the outer cylinder 3 is provided with an outer cylinder guide shoe 2. The top of the outer cylinder 3 is the outer cylinder guide shoe 2, which is conical, so that when the tubing coupling connector is lifted, it will not get stuck with the inner wall of the casing. The bottom of the alignment cylinder 17 is provided with a lower guide shoe 21 of the alignment cylinder.

[0032] Working principle: When using this tool, (1) First, load the split slip 7 and the adjusting copper ring 8 into the outer barrel 3, and then screw in the adapter sub 14, leaving a spacing of 20 - 30 mm from the end face of the outer barrel 3 to ensure that the slip has sufficient retraction and opening distance. (2) Then load the upper tubing 1, and insert the male end 18 of the upper tubing from the top of the outer barrel 3. Then slowly screw in the adapter sub 14 with a pipe wrench until the end faces of the split slip 7 are flush and centered synchronously when it is received into the inner conical surface 6 of the outer barrel. The manual make-up torque of the pipe wrench does not exceed 1000 N·m. At this time, an external force is needed to lift the upper tubing 1 by 50 - 80 kN to tighten the split slip 7 again and center it. (3) Then use a hydraulic tong to screw in the adapter sub 14 until it fits the end face of the outer barrel 3, and press the split slip 7 through the adjusting copper ring 8 to prevent it from retracting. The make-up torque is 6500 - 85000 N·m. If the torque parameter is not reached when the end faces are in contact, it needs to be withdrawn and replaced with a copper ring of the next larger thickness specification, and repeat the above steps. (4) After the outer barrel 3 and the adapter sub 14 are adjusted and connected in place, install the hexagon socket head screw 13 and the hexagon socket head fastening screw 5. (5) Screw in the guide barrel 17, and the make-up torque is 8000 - 10000 N·m. (6) Assemble the lower tubing string and connect it to the upper tubing 1, and lower it into the well. Slowly rotate the tubing coupling connector clockwise, introduce the tubing coupling 19 in the well through the guide shoe 21 at the lower end of the guide barrel and straighten it, and then continue to slowly rotate the tubing coupling connector clockwise to guide the male end 18 of the upper tubing to engage with the tubing coupling 19 in the well to complete the connection and resume production.

[0033] The above technical features constitute the best embodiment of the present utility model, which has strong adaptability and the best implementation effect. This tubing coupling connector has multiple models and can carry 2 3 / 8″, 2 7 / 8″, 3 1 / 2″ and other various tubing to engage with the tubing string left in the well to meet the requirements of different situations.

[0034] Finally, it should be noted that: The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An oil pipe buckle connector, comprising an upper oil pipe (1) and an in-well oil pipe body (20), wherein the in-well oil pipe body (20) is located inside an oil well, and the upper oil pipe (1) is located above the in-well oil pipe body (20), characterized in that: An outer cylinder (3) is installed on the outer side of the upper oil pipe (1), and a fastening screw hole (4) is provided on the surface of the outer cylinder (3), and the number of the fastening screw holes (4) is plural. The internal threads of the fastening screw holes (4) are connected with a hexagon socket fastening screw (5), and the end of the hexagon socket fastening screw (5) fits the outer surface of the upper oil pipe (1). The inner part of the outer cylinder (3) is provided with an outer cylinder inner cone surface (6). A transition joint (14) is installed at the bottom of the outer cylinder (3), and an adjustment copper ring (8) is provided at the top of the transition joint (14). A split-type split-flap slip (7) is provided at the top of the adjustment copper ring (8), and the split-type split-flap slip (7) is located inside the outer cylinder inner cone surface (6). A protection cylinder (17) is installed at the bottom of the transition joint (14), and the protection cylinder (17) is located above the oil pipe body (20) in the well. The outer surface of the transition joint (14) is provided with a top screw annular groove (11), the surface of the outer cylinder (3) is provided with a top screw screw hole (12), and the number of the top screw screw holes (12) is multiple, the internal threads of the top screw holes (12) are connected with a hexagon socket top screw screw (13), and the end of the hexagon socket top screw screw (13) is located inside the top screw annular groove (11).

2. The oil pipe buckle connector according to claim 1, characterized in that: The bottom of the outer cylinder (3) is provided with an outer cylinder connecting thread (9), the top of the transition joint (14) is provided with a transition joint upper connecting thread (10), and the outer cylinder connecting thread (9) is threadedly connected with the transition joint upper connecting thread (10).

3. The oil pipe buckle connector according to claim 1, characterized in that: The bottom of the transition joint (14) is provided with a transition joint double-stage trapezoidal thread (15), and the top of the protection tube (17) is provided with a protection tube double-stage trapezoidal thread (16). The transition joint double-stage trapezoidal thread (15) is threadedly connected with the protection tube double-stage trapezoidal thread (16).

4. The oil pipe buckle connector according to claim 1, characterized in that: An upper oil pipe male buckle end (18) is provided at the bottom of the upper oil pipe (1), an inner-hole oil pipe coupling (19) is provided at the top of the inner-hole oil pipe body (20), and the upper oil pipe male buckle end (18) is located directly above the inner-hole oil pipe coupling (19).

5. The oil pipe buckle connector according to claim 1, characterized in that: The top of the outer cylinder (3) is provided with an outer cylinder guide shoe (2), and the bottom of the protection cylinder (17) is provided with a protection cylinder lower end guide shoe (21).

6. The oil pipe buckle connector according to claim 1, characterized in that: The top of the split-type split-flap slip (7) is provided with a split-flap slip upper end surface (22), the inner surface of the split-type split-flap slip (7) is provided with a split-flap slip occlusal surface (23), and the bottom of the split-type split-flap slip (7) is provided with a split-flap slip lower end surface (24).

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