A tubing inner bore packer

Abstract

The utility model discloses an oil pipe hole plugging device, including mandrel, anchoring subassembly and sealing assembly, still be provided with adjusting assembly on the mandrel, anchoring subassembly includes slip seat and slip, and two pawls are symmetrically installed on the slip seat, sealing assembly includes connecting screw rod and the connection screw bush, tower type seal, sawtooth cover and first locating nut that are connected on the connecting screw rod in proper order, adjusting assembly includes the taper sleeve, sealing unit and the expansion taper sleeve that set up on the mandrel in proper order, the utility model discloses through utilizing slip and pawl combination in anchoring subassembly, can improve the success rate of setting, then through the sawtooth cover in sealing assembly, can guarantee in the pipe of serious fouling, and sawtooth cover can skive the scale of pipe wall, and the superposition tower type seal can guarantee under the premise of sealing, and the friction with pipe wall is reduced, finally utilize the sealing unit in adjusting assembly, can guarantee when the pressure in the well is big, and sealing is reliable, and the whole structure is simple, and easy processing.

Description

Technical Field

[0001] This utility model belongs to the technical field of auxiliary equipment for oilfield petroleum extraction, and in particular relates to an oil pipe borehole plug. Background Technology

[0002] Live pressure operation refers to controlling the annular pressure of the tubing and casing using a blowout preventer assembly and controlling the internal pressure of the tubing using an internal plug. Then, external force is applied to the tubing string to overcome the upward force within the well, thus completing the live tubing string setup and setup. For water injection wells, live pressure operation without blowout or overflow eliminates the need for depressurization in individual wells, solving the wastewater discharge problem and reducing water injection costs. For the entire injection-production network, it does not affect the injection operations of surrounding benefiting wells and injection stations, maintaining the formation pressure system of the entire injection-production network intact and eliminating the need to rebuild pressure balance, which is beneficial for improving water injection efficiency.

[0003] In oilfield water injection well pressurization equipment, the tubing borehole plugs currently used in oilfields have the following problems: ① Due to severe scaling in the tubing borehole during long-term water injection, the plug cannot be driven in; ② The water injection pressure in the tubing is high, sometimes exceeding 20 MPa, resulting in a low plugging success rate; ③ Conventional plugs use a two-slider structure, which creates a force couple under stress, leading to off-center plugging, poor sealing effect, and easy overflow. To address these issues, a new type of tubing borehole plug has been designed, which effectively solves the above problems. Utility Model Content

[0004] The technical problem to be solved by this utility model is to address the shortcomings of the prior art by providing an inner bore plug for oil tubing. By utilizing the combination of slips and pawls in the anchoring assembly, the success rate of setting the seal can be improved. Furthermore, the serrated sleeve in the sealing assembly can ensure that the scale on the pipe wall can be scraped off in pipes with severe scaling. The superimposed tower-type seal can reduce the friction with the pipe wall while ensuring a seal. Finally, the sealing unit in the adjusting assembly can ensure reliable sealing even under high well pressure. The overall structure is simple and easy to manufacture.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: an oil pipe inner hole plugger, including a mandrel, an anchoring component disposed at one end of the mandrel, and a sealing component disposed at the other end of the mandrel. The mandrel is also provided with an adjusting component for adjusting the position of the anchoring component, and the adjusting component is disposed between the anchoring component and the sealing component.

[0006] The anchoring assembly includes a slip seat disposed at one end of the mandrel and slips fitted on the mandrel with their ends installed in the slip seat. Two pawls are symmetrically mounted on the slip seat, and the pawls are rotatably mounted in the square groove of the slip seat.

[0007] The sealing assembly includes a connecting screw at the other end of the mandrel, and a connecting sleeve, a tower seal, a serrated sleeve, and a first positioning nut sequentially connected to the connecting screw; the first positioning nut is located at the end of the connecting screw away from the mandrel, the end of the connecting screw near the mandrel passes through the connecting sleeve, and the end of the connecting screw is connected to the connecting sleeve by a fixing nut;

[0008] The connecting threaded sleeve is connected to the mandrel via a connecting sleeve. The connecting sleeve is coaxially arranged at the other end of the mandrel and is connected between the adjusting component and the connecting threaded sleeve.

[0009] The adjusting assembly includes a tapered sleeve, a sealing unit, and a tightening tapered sleeve sequentially arranged on the mandrel. The tapered sleeve is arranged on the mandrel near the collet, the tightening tapered sleeve is arranged on the mandrel near the connecting screw, and the sealing unit is arranged between the tapered sleeve and the tightening tapered sleeve.

[0010] Furthermore, the end of the slip seat is provided with a circumferential hole for slip installation; the slip seat and the mandrel are connected by threads, the bottom of the circumferential hole is provided with an installation groove, the installation groove is provided with an internal thread, and the end of the mandrel is provided with an external thread that mates with the internal thread in the installation groove; the pawl is installed in the square groove by a pin.

[0011] Furthermore, one end of the connecting sleeve is connected to the connecting threaded sleeve by a thread, and the other end of the connecting sleeve is connected to the expansion tapered sleeve by a thread.

[0012] Furthermore, a second positioning nut is provided at the other end of the mandrel, and the second positioning nut is arranged inside the connecting sleeve; the second positioning nut and the mandrel are connected by threads, and the other end of the mandrel is provided with an external thread that mates with the internal thread of the second positioning nut.

[0013] Furthermore, the sealing unit includes a first cylindrical seal, a second cylindrical seal, and a skeleton cup seal sequentially arranged on the mandrel. The first cylindrical seal is arranged on the side close to the conical sleeve, and the skeleton cup seal is arranged on the side close to the tightening conical sleeve. A gasket is provided between the first cylindrical seal and the second cylindrical seal.

[0014] Furthermore, the end of the expansion conical sleeve that is sealed to the skeleton cup has a conical structure; the end of the expansion conical sleeve that is connected to the connecting sleeve has an external thread.

[0015] The beneficial effects of this utility model are that the combination of slips and pawls in the anchoring assembly can improve the success rate of setting the seal; the serrated sleeve in the sealing assembly can ensure that the scale on the pipe wall can be scraped off in pipes with severe scaling; the superimposed tower-type seal can reduce the friction with the pipe wall while ensuring a seal; finally, the sealing unit in the adjusting assembly can ensure reliable sealing when the pressure inside the well is high. The overall structure is simple and easy to process.

[0016] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1—Claw seat; 2—Claw claw; 3—Claw;

[0020] 4—Mandrel; 5—Conical sleeve; 6—First cylindrical seal;

[0021] 7—Gasket; 8—Second cylindrical seal; 9—Skeleton cup seal;

[0022] 10—Expansion tapered sleeve; 11—Second locating nut; 12—Connecting sleeve;

[0023] 13—Fixing nut; 14—Connecting sleeve; 15—Connecting screw;

[0024] 16—Tower-shaped seal; 17—Serrated sleeve; 18—First locating nut;

[0025] 19—Square groove. Detailed Implementation

[0026] like Figure 1 As shown, the present invention includes a mandrel 4, an anchoring component disposed at one end of the mandrel 4, and a sealing component disposed at the other end of the mandrel 4. The mandrel 4 is also provided with an adjusting component for adjusting the position of the anchoring component, and the adjusting component is disposed between the anchoring component and the sealing component.

[0027] The anchoring assembly includes a slip seat 1 disposed at one end of the mandrel 4 and a slip 3 fitted on the mandrel 4 with its end installed in the slip seat 1. Two pawls 2 are symmetrically mounted on the slip seat 1, and the pawls 2 are rotatably mounted in the square groove 19 of the slip seat 1.

[0028] The sealing assembly includes a connecting screw 15 disposed at the other end of the mandrel 4, and a connecting threaded sleeve 14, a tower-shaped seal 16, a serrated sleeve 17, and a first positioning nut 18 sequentially connected to the connecting screw 15; the first positioning nut 18 is disposed at the end of the connecting screw 15 away from the mandrel 4, the end of the connecting screw 15 near the mandrel 4 passes through the connecting threaded sleeve 14, and the end of the connecting screw 15 is connected to the connecting threaded sleeve 14 by a fixing nut 13;

[0029] The connecting screw sleeve 14 is connected to the mandrel 4 through the connecting sleeve 12. The connecting sleeve 12 is coaxially arranged at the other end of the mandrel 4, and the connecting sleeve 12 is connected between the adjusting component and the connecting screw sleeve 14.

[0030] The adjustment assembly includes a conical sleeve 5, a sealing unit, and an expansion conical sleeve 10 sequentially arranged on the mandrel 4. The conical sleeve 5 is arranged on the mandrel 4 near the slip 3, the expansion conical sleeve 10 is arranged on the mandrel 4 near the connecting screw 15, and the sealing unit is arranged between the conical sleeve 5 and the expansion conical sleeve 10.

[0031] In practical use, the combination of slips 3 and pawls 2 in the anchoring assembly can improve the success rate of setting the seal; the serrated sleeve 17 in the sealing assembly can scrape off the scale on the pipe wall in pipes with severe scaling; the superimposed tower-shaped seal 16 can reduce the friction with the pipe wall while ensuring a seal; finally, the sealing unit in the regulating assembly can ensure reliable sealing when the pressure inside the well is high. The overall structure is simple and easy to process.

[0032] like Figure 1 As shown, the left end of the spindle 4 is machined with an external thread to connect with the collet seat 1, and the right end of the spindle 4 is also machined with an external thread to cooperate with the second positioning nut 11.

[0033] like Figure 1 As shown, in this embodiment, the end of the slip seat 1 is provided with a circumferential hole for the slip 3 to be installed; the slip seat 1 and the mandrel 4 are connected by threads, the bottom of the circumferential hole is provided with an installation groove, the installation groove is provided with an internal thread, and the end of the mandrel 4 is provided with an external thread that mates with the internal thread in the installation groove; the pawl 2 is installed in the square groove 19 by a pin.

[0034] In actual use, the pawl 2 is installed in the square groove 19 and has a torsion spring effect, so that the two pawls 2 are always open to the sides.

[0035] In this embodiment, one end of the connecting sleeve 12 is connected to the connecting screw sleeve 14 by a thread, and the other end of the connecting sleeve 12 is connected to the expansion tapered sleeve 10 by a thread.

[0036] like Figure 1 As shown, in this embodiment, the other end of the mandrel 4 is provided with a second positioning nut 11, which is arranged inside the connecting sleeve 12; the second positioning nut 11 and the mandrel 4 are connected by threads, and the other end of the mandrel 4 is provided with an external thread that engages with the internal thread of the second positioning nut 11.

[0037] like Figure 1 As shown, in this embodiment, the sealing unit includes a first cylindrical seal 6, a second cylindrical seal 8, and a skeleton cup seal 9 sequentially arranged on the mandrel 4. The first cylindrical seal 6 is arranged on the side close to the conical sleeve 5, and the skeleton cup seal 9 is arranged on the side close to the tightening conical sleeve 10. A gasket 7 is provided between the first cylindrical seal 6 and the second cylindrical seal 8.

[0038] like Figure 1 As shown, in this embodiment, the end of the expansion conical sleeve 10 that connects to the skeleton cup seal 9 has a conical structure; the end of the expansion conical sleeve 10 that connects to the connecting sleeve 12 has an external thread.

[0039] In actual use, the end of the expansion tapered sleeve 10 connected to the skeleton cup seal 9 is machined with a tapered surface to open the skeleton cup seal 9, and the end of the expansion tapered sleeve 10 connected to the connecting sleeve 12 is machined with an external thread for installing the connecting sleeve 12.

[0040] When using this utility model, press [the following] before use. Figure 1 As shown, after assembling the parts, with the anchoring assembly facing upwards and the sealing assembly facing downwards, the tubing short section is placed inside the wellhead. The upper part of the tubing short section is connected to the outlet end of the large-displacement hydraulic pump truck, and the lower end is connected to the clamp head on the wellhead four-way valve. At this time, all valves are in the closed state.

[0041] Start the large-displacement hydraulic pump truck, open the valve on the four-way valve, and then open the valve on the pump opening valve. At this time, the tower-type seal 16 seals the inner wall of the oil pipe under the action of hydraulic pressure. The greater the hydraulic pressure, the better the sealing effect. When the pump pressure is greater than the well pressure, the hydraulic pressure pushes the entire plugger downward in the oil pipe.

[0042] By calculating the internal volume of the tubing string and comparing it with the pumped fluid discharge, the depth to which the plug should be inserted can be determined. Once the required depth is reached, the pump is stopped. At this point, the pressure inside the well will be greater than the fluid column pressure inside the tubing, and the plug will move upward. During the upward movement, the pawl 2 on the slip 3 is obstructed when it encounters the tubing step in the middle of the tubing coupling. At this time, the connecting sleeve 12 drives the expansion conical sleeve 10 to squeeze the skeleton cup seal 9, the first cylindrical seal 6, and the second cylindrical seal 8 upward, thereby driving the conical sleeve 5 to move upward. Under the action of the conical sleeve 5, the slip 3 opens, thereby achieving the anchoring and setting of the plug.

[0043] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the present utility model. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A pipe bore plugging device, characterized in that: It includes a mandrel (4), an anchoring assembly disposed at one end of the mandrel (4), and a sealing assembly disposed at the other end of the mandrel (4). The mandrel (4) is also provided with an adjusting assembly for adjusting the position of the anchoring assembly, and the adjusting assembly is disposed between the anchoring assembly and the sealing assembly. The anchoring assembly includes a slip seat (1) disposed at one end of the mandrel (4) and a slip (3) fitted on the mandrel (4) and the end of the slip seat (1) is installed inside the slip seat (1). Two pawls (2) are symmetrically installed on the slip seat (1), and the pawls (2) are rotatably installed in the square groove (19) of the slip seat (1). The sealing assembly includes a connecting screw (15) disposed at the other end of the mandrel (4), and a connecting threaded sleeve (14), a tower seal (16), a serrated sleeve (17), and a first positioning nut (18) sequentially connected to the connecting screw (15); the first positioning nut (18) is disposed at the end of the connecting screw (15) away from the mandrel (4), the end of the connecting screw (15) near the mandrel (4) passes through the connecting threaded sleeve (14), and the end of the connecting screw (15) is connected to the connecting threaded sleeve (14) by a fixing nut (13); The connecting screw sleeve (14) is connected to the mandrel (4) through the connecting sleeve (12). The connecting sleeve (12) is coaxially arranged at the other end of the mandrel (4), and the connecting sleeve (12) is connected between the adjusting component and the connecting screw sleeve (14). The adjustment assembly includes a conical sleeve (5), a sealing unit, and a tightening conical sleeve (10) sequentially arranged on the mandrel (4). The conical sleeve (5) is arranged on the mandrel (4) near the slip (3), the tightening conical sleeve (10) is arranged on the mandrel (4) near the connecting screw (15), and the sealing unit is arranged between the conical sleeve (5) and the tightening conical sleeve (10).

2. The tubing bore plug according to claim 1, characterized in that: The end of the slip seat (1) is provided with a circumferential hole for the slip (3) to be installed; the slip seat (1) and the mandrel (4) are connected by threads, the bottom of the circumferential hole is provided with an installation groove, the installation groove is provided with an internal thread, and the end of the mandrel (4) is provided with an external thread that mates with the internal thread in the installation groove; the pawl (2) is installed in the square groove (19) by a pin.

3. The tubing bore plug according to claim 2, characterized in that: One end of the connecting sleeve (12) is connected to the connecting threaded sleeve (14) by a thread, and the other end of the connecting sleeve (12) is connected to the expansion tapered sleeve (10) by a thread.

4. The tubing bore plugging device according to claim 1, characterized in that: The other end of the mandrel (4) is provided with a second positioning nut (11), which is arranged inside the connecting sleeve (12); the second positioning nut (11) and the mandrel (4) are connected by threads, and the other end of the mandrel (4) is provided with an external thread that engages with the internal thread of the second positioning nut (11).

5. The tubing bore plug according to claim 3, characterized in that: The sealing unit includes a first cylindrical seal (6), a second cylindrical seal (8), and a skeleton cup seal (9) arranged sequentially on the mandrel (4). The first cylindrical seal (6) is arranged on the side close to the conical sleeve (5), and the skeleton cup seal (9) is arranged on the side close to the expansion conical sleeve (10). A gasket (7) is provided between the first cylindrical seal (6) and the second cylindrical seal (8).

6. The tubing bore plug according to claim 5, characterized in that: The end of the expansion conical sleeve (10) connected to the skeleton cup seal (9) has a conical structure; the end of the expansion conical sleeve (10) connected to the connecting sleeve (12) has an external thread.

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