Tail pipe roller centralizing device for sand washing

Abstract

The utility model relates to the technical field of sand washing production, in particular to a tail pipe roller centralizing device for sand washing, which comprises a centralizing cylinder, a first limiting ring seat is arranged inside the top end of the centralizing cylinder, a limiting sleeve is arranged in the middle of the centralizing cylinder, and a connecting sleeve is arranged at the bottom of the centralizing cylinder. The bottom end of the centralizing cylinder is movably connected with a lower connector, and the surface of the lower connector is fixedly connected with a threaded pipe. Through the centralizing cylinder, the first limiting ring seat, the lower joint, the threaded pipe, the pressure spring, the roller frame, the limiting roller and the conical groove, the oil pipe can be effectively centralized and prevented from vibrating without influencing the movement of the small oil pipe, and in the actual use process, the tail pipe roller type centralizing device is connected to the bottom of the large oil pipe, so that the oil pipe can be effectively centralized along with the descending of a sand surface. The small oil pipe is limited to move in the centralizing device under the action of gravity, the rollers are located on a conical surface with a narrow upper portion and a wide lower portion, and the distance between the rollers changes along with movement of the inner wall of the conical surface.

Description

Technical Field

[0001] The utility model relates to the technical field of sand blasting production, in particular to a tail pipe roller straightening device for sand blasting. Background Art

[0002] Sand flushing refers to using high-speed flowing liquid to disperse the sand blockage at the bottom of the well, and using the circulation capacity of the liquid flow to circulate upward to bring the dispersed sand out to the ground, thereby clearing the accumulated sand at the bottom of the well, restoring and increasing the production of the well or the injection volume of the water injection well.

[0003] In the existing equipment, during the air negative pressure sand flushing process in coalbed methane wells, the Φ48mm small oil pipe is inside the Φ73mm large oil pipe. The small oil pipe automatically falls as the sand surface decreases, and the settled sand is continuously taken out from the small oil pipe under the action of pressure. In this process, it is necessary to ensure that the Φ48mm small oil pipe is in the center position of the Φ73mm large oil pipe and cannot vibrate. Only by effectively preventing the small oil pipe from vibrating and shaking during the sand flushing process can the construction safety and sand flushing efficiency be guaranteed. Therefore, it is urgent to design a tail pipe roller straightening device for sand flushing to solve the above problems. Summary of the invention

[0004] The utility model aims to provide a tail pipe roller straightening device for sand flushing, so as to solve the problem proposed in the above background technology that in the air negative pressure sand flushing process of coalbed methane wells, the existing equipment has a Φ48mm small oil pipe inside the Φ73mm large oil pipe, and the small oil pipe automatically falls down as the sand surface is lowered, and the settled sand is continuously brought out from the small oil pipe under the action of pressure. In this process, it is necessary to ensure that the Φ48mm small oil pipe is in the center position of the Φ73mm large oil pipe and cannot vibrate. Only by effectively preventing the small oil pipe from vibrating and shaking during the sand flushing process can the construction safety and sand flushing efficiency be guaranteed.

[0005] To achieve the above object, the utility model provides the following technical solutions: a tail pipe roller straightening device for sand blasting, comprising a straightening cylinder, a first limiting ring seat is arranged inside the top of the straightening cylinder, a limiting sleeve is arranged in the middle of the straightening cylinder, and a connecting sleeve is arranged at the bottom of the straightening cylinder;

[0006] A lower joint is movably connected to the bottom end of the straightening cylinder, and a threaded pipe is fixedly connected to the surface of the lower joint.

[0007] Preferably, a compression spring is provided at the top of the threaded tube, and a roller frame is fixedly connected to the top end of the compression spring.

[0008] Preferably, a roller hoop groove is provided inside the roller frame, and limiting rollers are provided at the four corners of the inner wall of the roller hoop groove.

[0009] Preferably, a conical groove is provided inside the limiting sleeve, and a damping inner pad is provided on the inner wall of the conical groove.

[0010] Preferably, a connecting groove is provided inside the connecting sleeve, and a connecting thread is provided on the inner wall of the connecting groove.

[0011] Preferably, the four bottom corners of the first limiting ring seat are fixedly connected to the limiting side plate, the bottom end of the limiting side plate is fixedly connected to the second limiting ring seat, and the inner wall of the limiting side plate is provided with a limiting rubber strip.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The tail pipe roller straightening device for sand flushing can effectively straighten the oil pipe and prevent vibration without affecting the movement of the small oil pipe through the straightening cylinder, the first limiting ring seat, the lower joint, the threaded pipe, the compression spring, the roller frame, the limiting roller and the tapered groove. In actual use, the tail pipe roller straightening device is connected to the bottom of the large oil pipe. As the sand surface drops, the small oil pipe is restricted to move inside the straightening device under the action of gravity. The roller is on a conical surface that is narrow at the top and wide at the bottom. The roller spacing changes with the movement of the inner wall of the conical surface. The minimum roller spacing is 48.5mm and the maximum is 57mm, ensuring that the oil pipe and its coupling can pass through. The straightening device is designed with a compression spring with an inner diameter greater than 57mm. The compression spring makes the roller always in a stressed state. The roller always rolls on the outer wall of the small oil pipe to ensure the straightening effect. The roller and the compression spring can be replaced after being worn, which is economical to use and reflects the practicality of the equipment design. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional schematic diagram of the structure of the utility model;

[0015] Figure 2 It is an overall schematic diagram of the lower joint structure of the utility model;

[0016] Figure 3 It is a schematic diagram of the structure of the centralizing cylinder of the utility model;

[0017] Figure 4 It is an overall schematic diagram of the first limiting ring seat structure of the utility model.

[0018] In the figure: 1. straightening cylinder; 2. first limiting ring seat; 3. limiting sleeve; 4. connecting sleeve; 5. lower joint; 6. threaded pipe; 7. compression spring; 8. roller frame; 9. roller hoop groove; 10. limiting roller; 11. conical groove; 12. damping inner pad; 13. connecting groove; 14. connecting thread; 15. limiting side plate; 16. second limiting ring seat; 17. limiting rubber strip. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figure 1-4 , an embodiment provided by the utility model:

[0021] A tail pipe roller straightening device for sand flushing comprises a straightening cylinder 1, a first limiting ring seat 2 is arranged inside the top of the straightening cylinder 1, a limiting sleeve 3 is arranged in the middle of the straightening cylinder 1, a connecting sleeve 4 is arranged at the bottom of the straightening cylinder 1, a conical groove 11 is opened inside the limiting sleeve 3, a damping inner pad 12 is arranged on the inner wall of the conical groove 11, a connecting groove 13 is opened inside the connecting sleeve 4, a connecting thread 14 is arranged on the inner wall of the connecting groove 13, the bottom four corners of the first limiting ring seat 2 are fixedly connected to limiting side plates 15, the bottom end of the limiting side plate 15 is fixedly connected to a second limiting ring seat 16, and a limiting rubber strip 17 is arranged on the inner wall of the limiting side plate 15.

[0022] The lower joint 5 is movably connected to the bottom end of the straightening cylinder 1, a threaded tube 6 is fixedly connected to the surface of the lower joint 5, a compression spring 7 is arranged on the top of the threaded tube 6, a roller frame 8 is fixedly connected to the top of the compression spring 7, a roller hoop groove 9 is opened inside the roller frame 8, and limiting rollers 10 are arranged at the four corners of the inner wall of the roller hoop groove 9.

[0023] Working principle: When in use, the user first assembles the roller frame 8, the limit roller 10, the compression spring 7, and the lower joint 5 with the bottom of the straightening cylinder 1. The threaded tube 6 on the surface of the lower joint 5 is tightened with the connecting thread 14 of the connecting groove 13. The straightening cylinder 1 is connected to the bottom of the Φ73mm oil pipe. When the Φ48mm small oil pipe moves to the right inside the straightening device, the limit roller 10 always rolls close to the outer wall of the small oil pipe. When the Φ48mm small oil pipe coupling is about to pass, the coupling squeezes the limit roller 10 and the roller frame 8 to move to the right. , the compression spring 7 is compressed, and at this time, in conjunction with the conical groove 11 and the damping inner pad 12 inside the limiting sleeve 3, the roller spacing naturally becomes larger, and the coupling passes smoothly under the straightening action of the limiting roller 10. At the same time, the small oil pipe can be limited by the first limiting ring seat 2 and the second limiting ring seat 16 inside the straightening cylinder 1. At this time, the first limiting ring seat 2 and the second limiting ring seat 16 perform protective limiting operations on the side of the oil pipe through the limiting rubber strip 17 on the inner wall of the limiting side plate 15, thereby improving the completeness of the normal adjustment of the equipment. The above is the entire working principle of the utility model.

[0024] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A tail pipe roller straightening device for sand flushing, comprising a straightening cylinder (1), characterized in that: A first limiting ring seat (2) is arranged inside the top end of the straightening cylinder (1), a limiting sleeve (3) is arranged in the middle of the straightening cylinder (1), and a connecting sleeve (4) is arranged at the bottom of the straightening cylinder (1); A lower joint (5), the bottom end of the straightening cylinder (1) is movably connected to the lower joint (5), and the surface of the lower joint (5) is fixedly connected to a threaded pipe (6).

2. The tail pipe roller straightening device for sand blasting according to claim 1, characterized in that: A compression spring (7) is provided at the top of the threaded tube (6), and a roller frame (8) is fixedly connected to the top end of the compression spring (7).

3. The tail pipe roller straightening device for sand blasting according to claim 2, characterized in that: A roller hoop groove (9) is provided inside the roller frame (8), and limiting rollers (10) are provided at four corners of the inner wall of the roller hoop groove (9).

4. The tail pipe roller straightening device for sand blasting according to claim 1, characterized in that: A conical groove (11) is provided inside the limiting sleeve (3), and a damping inner pad (12) is provided on the inner wall of the conical groove (11).

5. The tail pipe roller straightening device for sand blasting according to claim 1, characterized in that: A connecting groove (13) is provided inside the connecting sleeve (4), and a connecting thread (14) is provided on the inner wall of the connecting groove (13).

6. The tail pipe roller straightening device for sand blasting according to claim 1, characterized in that: The four bottom corners of the first limiting ring seat (2) are fixedly connected to the limiting side plate (15), the bottom end of the limiting side plate (15) is fixedly connected to the second limiting ring seat (16), and the inner wall of the limiting side plate (15) is provided with a limiting rubber strip (17).

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