Concentric pipe gas lift working barrel

Abstract

The utility model discloses a concentric pipe gas lift working barrel in the technical field of working barrels, which comprises a working barrel body, a gas lift valve seat is mounted at the top end of the working barrel body through a fixing hoop, and a barrel head is assembled at the lower end of the working barrel body; fastening plates are mounted at the two ends of an opening of the fixing hoop, threaded holes are formed in the side walls of the fastening plates, and fasteners are in threaded connection with the interiors of the threaded holes; a limiting groove is formed in the fixing hoop, a limiting block is mounted on the outer wall of the working barrel, and the limiting block is clamped in the limiting groove; the fastener comprises a fastening screw rod and an anti-falling screw rod, and a fastening nut is in threaded connection with the outer part of the fastening screw rod; the bottom end of the fastening screw rod is provided with an anti-disengaging screw groove, and the anti-disengaging screw rod is connected into the anti-disengaging screw groove in a threaded mode. According to the concentric pipe gas lift working barrel, due to the arrangement of the concentric pipe gas lift working barrel, under the meshing of the limiting column and the fastening screw rod, the anti-disengaging screw rod and the fastening screw rod are kept in a stable connection limiting state, and the concentric pipe gas lift working barrel has a good tooth retreating prevention function and is high in connection strength and extremely high in connection stability.

Description

Technical Field

[0001] The utility model relates to the technical field of working cylinders, in particular to a concentric tube gas lift working cylinder. Background Art

[0002] Small oil pipes are often lowered into the production tubing of oilfield gas wells and hung on the original wellhead device. The newly lowered small oil pipes narrow the flow channel of the produced gas, making it a "velocity pipe string" and improving the drainage and gas production efficiency of the gas well; gas lift, as a type of mechanical oil (gas) production method, has the advantages of low cost, high reliability, no influence of sand, paraffin and salt, and easy maintenance. It lifts the well fluid to the ground by injecting high-pressure natural gas or nitrogen into the well. It can be used for gas lift oil production, drainage and gas production, acid fracturing (chemicalization) flowback, completion and blowout induction, drainage measures, and drainage to increase production.

[0003] However, the connection strength between the concentric tube gas lift working cylinder and the gas lift valve seat in the prior art is low and is easily affected by the bolts and falls off, so the prior art needs to be improved. Utility Model Content

[0004] The purpose of the utility model is to provide a concentric tube gas lift working cylinder to solve the problem in the prior art proposed in the above background technology that the connection strength between the concentric tube gas lift working cylinder and the gas lift valve seat is low and easily affected by the bolts and falls off.

[0005] To achieve the above object, the utility model provides the following technical solution: a concentric tube gas lift working cylinder, comprising a working cylinder body, a gas lift valve seat is mounted on the top end of the working cylinder body through a fixing hoop, and a cylinder head is assembled on the lower end of the working cylinder body;

[0006] A fastening plate is installed at both ends of the opening of the fixing hoop, and a threaded hole is opened on the side wall of the fastening plate, and a fastener is screwed inside the threaded hole;

[0007] A limiting groove is provided inside the fixing hoop, and a limiting block is installed on the outer wall of the working cylinder, and the limiting block is clamped in the limiting groove;

[0008] The fastener comprises a fastening screw and an anti-slip screw, and the outside of the fastening screw is threaded with a fastening nut;

[0009] The bottom end of the fastening screw is provided with an anti-slip groove, and the anti-slip screw is screwed into the anti-slip groove;

[0010] The outer portion of the anti-slip screw is sleeved with an anti-slip cylinder, and the outer wall of the anti-slip cylinder is equipped with three limiting columns, which are distributed in a triangular shape.

[0011] The inner wall of each of the limiting columns is provided with a spiral groove that matches the fastening screw.

[0012] As a preferred concentric tube gas lift working cylinder of the present invention, the inner wall of the anti-slip cylinder is provided with a reverse internal thread, the outer part of the anti-slip screw is provided with a reverse external thread at the joint with the anti-slip cylinder, and the reverse internal thread and the reverse external thread match each other.

[0013] As a preferred embodiment of the concentric tube air lift working cylinder of the present invention, a turntable is installed at the end of the anti-slip screw, and a cross groove is provided on the outer wall of the turntable.

[0014] As a preferred embodiment of the concentric tube gas lift working cylinder of the present invention, an annular rotation groove is provided on the outer wall of the fastening nut, and the end of the limiting column is arranged in the annular rotation groove.

[0015] As a preferred concentric tube gas lift working cylinder of the present invention, a fixing ring is fixedly installed on the outer upper end of the fastening screw, and the circumferential surface of the fastening screw is covered with an annular pressure plate, a spring and an annular rubber sheet.

[0016] As a preferred concentric tube air lift working cylinder of the present invention, the annular pressure plate is located on the upper side of the fixed ring, the spring is located on the upper side of the annular pressure plate, the annular rubber sheet is located on the lower side of the fixed ring, and an extrusion block is fixedly installed at the lower end edge of the annular pressure plate.

[0017] As a preferred embodiment of the concentric tube gas lift working cylinder of the present invention, a rubber cushion layer is installed on the inner wall of the fixing hoop.

[0018] Compared with the prior art, the beneficial effects of the present invention are: the setting of the concentric tube gas lift working cylinder is reasonable in structure design;

[0019] By setting a fixing hoop between the working cylinder body and the gas lift valve seat, and setting a fastener at the connection of the fixing hoop, the fastening nut is circumferentially limited to prevent the nut structure from rotating and causing tooth retreat. Under the engagement of the limiting column and the fastening screw, the anti-slip screw and the fastening screw are kept in a stable connection and limiting state, which has a good anti-tooth retreat function, high connection strength and extremely high connection stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the fixing hoop of the utility model;

[0022] Figure 3 This is a schematic diagram of the fastener of the utility model;

[0023] Figure 4 This is a schematic diagram of the anti-drop tube of the utility model.

[0024] In the figure: 1. Working cylinder; 2. Cylinder head; 3. Gas lift valve seat; 4. Fixing hoop; 5. Limit block; 6. Limit groove; 7. Rubber pad; 8. Fastening plate; 9. Threaded hole; 10. Fastener; 11. Annular groove; 12. Fixing ring; 13. Extrusion block; 14. Annular pressure plate; 15. Annular rubber sheet; 16. Spring; 17. Limit column; 18. Spiral groove; 19. Anti-slip screw; 20. Anti-slip cylinder; 21. Anti-slip screw groove; 22. Fastening nut; 23. Fastening screw. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] See also Figure 1-4 , the utility model provides a technical solution:

[0027] In this technical solution, a concentric tube gas lift working cylinder includes a working cylinder body 1, a gas lift valve seat 3 is installed on the top of the working cylinder body 1 through a fixing hoop 4, and a cylinder head 2 is assembled on the lower end of the working cylinder body 1; fastening plates 8 are installed at both ends of the opening of the fixing hoop 4, and the side walls of the fastening plates 8 are provided with threaded holes 9, and the inside of the threaded holes 9 is screwed with fasteners 10; a limiting groove 6 is provided inside the fixing hoop 4, and a limiting block 5 is installed on the outer wall of the working cylinder body 1, and the limiting block 5 is clamped in the limiting groove 6; The fastener 10 includes a fastening screw 233 and an anti-slip screw 19, and the outside of the fastening screw 19 is threaded with a fastening nut 22; the bottom end of the fastening screw 23 is provided with an anti-slip groove 21, and the anti-slip screw 19 is threaded in the anti-slip groove 21; the outside of the anti-slip screw 19 is sleeved with an anti-slip cylinder 20, and the outer wall of the anti-slip cylinder 20 is installed with three limiting columns 17, and the three limiting columns 17 are distributed in a triangular shape; the inner wall of each limiting column 17 is provided with a spiral groove 18 that cooperates with the fastening screw 23.

[0028] In this technical solution, the fastening screw 23 and the fastening nut 22 cooperate to realize the bolt in the prior art, and an anti-slip groove 21 is provided at the bottom end of the fastening screw 23, and the anti-slip screw 19 is screwed in. The three limiting columns 17 installed on the anti-slip cylinder 20 outside the anti-slip screw 19 support the fastening nut 22, thereby circumferentially limiting the fastening nut 22, and the spiral groove 18 on the limiting column 17 engages with the fastening screw 23, thereby limiting the anti-slip cylinder 20 and the anti-slip screw 19.

[0029] In some technical solutions, the inner wall of the anti-slip cylinder 20 is provided with a reverse internal thread 19, and the outer part of the anti-slip screw 19 is provided with a reverse external thread 20 at the joint with the anti-slip cylinder 20, and the reverse internal thread 19 and the reverse external thread 20 match each other.

[0030] In this technical solution, the external thread of the anti-slip screw 19 is divided into two parts. The front part cooperates with the internal thread of the anti-slip screw groove 21, and the rear part cooperates with the reverse internal thread 19 of the anti-slip cylinder 20, thereby installing the anti-slip cylinder 20 on the outside of the anti-slip screw 19.

[0031] In some technical solutions, a turntable is installed at the end of the anti-slip screw 19, and a cross groove is opened on the outer wall of the turntable.

[0032] In this technical solution, the anti-slip screw 19 is easily rotated by the turntable, and the cross slot is provided to facilitate operation with a screwdriver.

[0033] In some technical solutions, an annular rotation groove 11 is formed on the outer wall of the fastening nut 22 , and the end of the limiting column 17 is arranged in the annular rotation groove 11 .

[0034] In this technical solution, when the anti-slip screw 19 is screwed into the anti-slip groove 21, the anti-slip cylinder 20 will rotate accordingly, and when the limiting column 17 contacts the fastening nut 22, it can rotate in the annular groove 11 until it contacts the inner wall of the annular groove 11, thereby supporting the fastening nut 22 and performing circumferential limiting.

[0035] In some technical solutions, a fixing ring 12 is fixedly mounted on the outer upper end of the fastening screw 23 , and an annular pressing plate 14 , a spring 16 and an annular rubber sheet 15 are sheathed on the circumferential surface of the fastening screw 23 .

[0036] In this technical solution, when the fastening screw 23 is rotated, the annular rubber sheet 15 slides upward due to the action of the screw hole. As the screw is further twisted, the annular rubber sheet 15 contacts the fixing ring 12. The annular rubber sheet 15 is deformed due to the action of the fixing ring 12, sealing the screw hole. The spring 16 is located on the upper side of the annular pressure sheet 14, so that the annular pressure sheet 14 is squeezed downward due to the action of the spring 16. The extrusion block 13 is squeezed downward due to the action of the annular pressure sheet 14, so that the extrusion block 13 further squeezes the edge of the annular rubber sheet 15, thereby improving the sealing effect. The annular pressure sheet 14 is located on the upper side of the fixing ring 12, the spring 16 is located on the upper side of the annular pressure sheet 14, the annular rubber sheet 15 is located on the lower side of the fixing ring 12, and the extrusion block 13 is fixedly installed at the lower end edge of the annular pressure sheet 14.

[0037] In some technical solutions, a rubber cushion layer 7 is installed on the inner wall of the fixing hoop 4;

[0038] In this technical solution, the friction force can be improved by the rubber cushion layer 7.

[0039] Working principle:

[0040] During installation, the working cylinder 1 is connected to the gas lift valve seat 3 through the fixing hoop 4 , installed by the cooperation of the limiting block 5 and the limiting groove 6 , and then fastened by the fastener 10 .

[0041] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0042] While the present invention has been described above with reference to exemplary embodiments, various modifications may be made and equivalent components may be substituted without departing from the scope of the present invention. In particular, as long as no structural conflicts exist, the various features of the disclosed embodiments may be combined with one another in any manner. The omission of an exhaustive description of these combinations in this specification is solely for the sake of space and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A concentric tube gas lift mandrel, comprising a mandrel body (1), characterized in that: The top end of the working cylinder (1) is mounted with a gas lift valve seat (3) via a fixing hoop (4), and the lower end of the working cylinder (1) is equipped with a cylinder head (2); A fastening plate (8) is installed at both ends of the opening of the fixing hoop (4), a threaded hole (9) is opened on the side wall of the fastening plate (8), and a fastener (10) is screwed inside the threaded hole (9); A limiting groove (6) is provided inside the fixing hoop (4), a limiting block (5) is installed on the outer wall of the working cylinder (1), and the limiting block (5) is clamped in the limiting groove (6); The fastener (10) comprises a fastening screw (23) and an anti-slip screw (19), and the fastening screw (23) is externally threaded with a fastening nut (22); The bottom end of the fastening screw (23) is provided with an anti-slip groove (21), and the anti-slip screw (19) is screwed into the anti-slip groove (21); The outer portion of the anti-slip screw (19) is sleeved with an anti-slip cylinder (20), and the outer wall of the anti-slip cylinder (20) is provided with three limiting columns (17), and the three limiting columns (17) are distributed in a triangular shape; The inner wall of each of the limiting columns (17) is provided with a spiral groove (18) that matches the fastening screw (23).

2. The concentric tube gas lift mandrel according to claim 1, characterized in that: The inner wall of the anti-slip cylinder (20) is provided with a reverse internal thread, and the outer portion of the anti-slip screw (19) and the anti-slip cylinder (20) are provided with a reverse external thread, and the reverse internal thread and the reverse external thread are matched.

3. The concentric tube gas lift mandrel according to claim 2, characterized in that: A turntable is installed at the end of the anti-slip screw (19), and a cross groove is provided on the outer wall of the turntable.

4. The concentric tube gas lift mandrel according to claim 2, characterized in that: An annular rotation groove (11) is formed on the outer wall of the fastening nut (22), and the end of the limiting column (17) is arranged in the annular rotation groove (11).

5. The concentric tube gas lift mandrel according to claim 4, characterized in that: A fixing ring (12) is fixedly mounted on the outer upper end of the fastening screw (23), and an annular pressing sheet (14), a spring (16) and an annular rubber sheet (15) are sheathed on the circumferential surface of the fastening screw (23).

6. The concentric tube gas lift mandrel according to claim 5, characterized in that: The annular pressing plate (14) is located on the upper side of the fixing ring (12), the spring (16) is located on the upper side of the annular pressing plate (14), the annular rubber sheet (15) is located on the lower side of the fixing ring (12), and an extrusion block (13) is fixedly installed at the lower end edge of the annular pressing plate (14).

7. The concentric tube gas lift mandrel according to claim 1, characterized in that: A rubber cushion layer (7) is installed on the inner wall of the fixing hoop (4).

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