Lining oil pipe

Abstract

The utility model discloses a lining oil pipe, which relates to the field of oil pipes and comprises a pipe body, a spiral recess is arranged on the outer surface of the pipe body, a connecting groove is arranged at the top end of the inner side of the pipe body, a connecting lantern ring is fixedly mounted at the bottom end of the pipe body, and the connecting lantern ring is matched with the connecting groove in a threaded manner. A spiral bulge is formed on the inner wall of the pipe body due to the spiral recess, and a wear-resistant coating is coated on the crest surface of the spiral bulge and is a silicon carbide ceramic coating. According to the lining oil pipe, the spiral recesses can increase the contact area with air and liquid in an oil well outside the lining oil pipe, so that the heat dissipation effect is improved by means of low temperature in the oil well, the spiral protrusions effectively reduce the contact area between the lining oil pipe and a sucker rod, the friction surface is reduced, and the service life of the lining oil pipe is prolonged. Therefore, the high temperature phenomenon caused by frequent friction between the lining oil pipe and the sucker rod is effectively avoided, and the protection effect is better.

Description

Technical Field

[0001] The utility model relates to the field of oil pipes, in particular to an inner-lined oil pipe. Background Art

[0002] The oil pipe liner is a device used to avoid direct friction between the sucker rod and the oil pipe, thereby preventing the inner wall of the oil pipe from wearing. When in use, it is sleeved on the outside of the sucker rod to play a protective role.

[0003] However, in the existing lined tubing inclined well section, the sucker rod needs to make a high-frequency reciprocating motion in the lined tubing, and high temperature will be generated during the reciprocating motion. On the one hand, the contact surface between the conventional lined tubing and the sucker rod is large, and the friction area is large, which makes the high temperature phenomenon more serious. On the other hand, the conventional lined tubing has poor temperature diffusion capacity, so that the conventional lined tubing is prone to damage to the lined tubing and the sucker rod due to high-frequency friction during use, and the service life is reduced.

[0004] To this end, this case proposes a lined oil pipe, which solves the above technical problems by reducing the contact area between the inner wall of the lined oil pipe and the pumping rod, and increasing the contact area between the outer wall of the lined oil pipe and the liquid. Utility Model Content

[0005] The main purpose of the utility model is to provide a lined oil pipe, which can effectively solve the technical problems in the background technology.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A lined oil pipe comprises a pipe body, wherein the outer surface of the pipe body is provided with a spiral depression, the inner top end of the pipe body is provided with a connecting groove, and the bottom end of the pipe body is fixedly installed with a connecting ring, and the connecting ring is threadably matched with the connecting groove.

[0008] As a further solution of the utility model, the inner wall of the tube body is formed with a spiral protrusion due to the spiral depression.

[0009] As a further solution of the utility model, the top surface of the spiral protrusion is coated with a wear-resistant coating, and the wear-resistant coating is a silicon carbide ceramic coating.

[0010] As a further solution of the utility model, a limiting ring is fixedly installed at the bottom end of the connecting groove inside the tube body, and the distance between the top of the limiting ring and the top surface of the tube body is equal to the length of the connecting ring.

[0011] As a further solution of the utility model, the arc of the spiral depression is 1 / 2 circle.

[0012] The beneficial effects of the utility model are as follows:

[0013] By arranging the spiral depression in conjunction with the spiral protrusion, the spiral depression can increase the contact area with the air and the liquid in the oil well on the outside of the lining oil pipe, thereby increasing the heat dissipation effect by taking advantage of the low temperature in the oil well, and the spiral protrusion effectively reduces the contact surface between the lining oil pipe and the sucker rod, reduces the friction surface, and further reduces the heat generation, thereby effectively avoiding the high temperature phenomenon caused by frequent friction between the lining oil pipe and the sucker rod, and the protection effect is better. In addition, the spiral depression is arranged in a spiral shape, which can prevent the liquid in the oil well from accumulating on the inside of the spiral depression, and continuously keep the low-temperature liquid in contact with the pipe body;

[0014] By providing a connecting ring in conjunction with the connecting groove, every two adjacent pipe bodies can be connected together through the connecting groove and the connecting ring, thereby realizing a splicing function and facilitating installation and later maintenance and removal. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of an inner-lined oil pipe with a sucker rod according to the utility model;

[0016] Figure 2 This is a cross-sectional view of a tube body with a sucker rod of an inner-lined oil tube of the utility model;

[0017] Figure 3 This is a cross-sectional view of a tube body of an inner-lined oil tube without a sucker rod according to the utility model;

[0018] Figure 4 This is a front view of a cross-section of a lined oil pipe of the utility model;

[0019] Figure 5 This is a demonstration diagram of the connection of two pipe bodies with a sucker rod of an inner-lined oil pipe of the utility model;

[0020] Figure 6 This is a cross-sectional view of the connection of two pipe bodies with a sucker rod of an inner-lined oil pipe of the utility model;

[0021] Figure 7 This is a cross-sectional view of two tube bodies of an inner-lined oil pipe without a sucker rod according to the utility model.

[0022] In the figure: 1. pipe body; 2. spiral depression; 3. connecting groove; 4. connecting ring; 5. spiral protrusion; 6. limiting ring; 7. wear-resistant coating. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0024] like Figure 1-Figure 7As shown, a lined oil pipe includes a pipe body 1, the outer surface of the pipe body 1 is provided with a spiral depression 2, the inner top end of the pipe body 1 is provided with a connecting groove 3, and the bottom end of the pipe body 1 is fixedly installed with a connecting ring 4, and the connecting ring 4 is threadably matched with the connecting groove 3.

[0025] In this embodiment, the inner wall of the tube body 1 is formed with a spiral protrusion 5 due to the spiral depression 2;

[0026] The spiral depression 2 can increase the contact area between the inner lining tubing and the liquid in the oil well, thereby increasing the heat dissipation effect by taking advantage of the low temperature in the oil well. The spiral protrusion 5 effectively reduces the contact area between the inner lining tubing and the sucker rod, reduces the friction area, and further reduces the heat generation.

[0027] In this embodiment, the top surface of the spiral protrusion 5 is coated with a wear-resistant coating 7, and the wear-resistant coating 7 is a silicon carbide ceramic coating;

[0028] The wear-resistant coating 7 can increase the wear resistance and prolong the service life of the inner lining oil pipe.

[0029] In this embodiment, a limit ring 6 is fixedly installed at the bottom end of the connecting groove 3 inside the tube body 1, and the distance between the top of the limit ring 6 and the top surface of the tube body 1 is equal to the length of the connecting ring 4;

[0030] The limiting ring 6 can play a limiting role.

[0031] In this embodiment, the arc of the spiral depression 2 is 1 / 2 circle;

[0032] The 1 / 2 circle arc surface has a larger contact area and better heat dissipation effect.

[0033] It should be noted that the utility model is a lined oil pipe. When in use, a number of pipe bodies 1 are sequentially sleeved on the outside of the sucker rod. Two adjacent pipe bodies 1 are threadedly connected through a connecting groove 3 and a connecting collar 4, so that protection can be formed on the outside of the sucker rod. During use, the sucker rod and the spiral protrusion 5 generate friction, and the friction generates heat energy. The air in the oil well also exchanges heat with the entire lined oil pipe through the outer wall of the pipe body 1 and the spiral depression 2, thereby achieving the effect of continuously cooling the lined oil pipe. Moreover, since the spiral depression 2 is spiral, there will be no problem of liquid accumulation, ensuring that low-temperature liquid is in continuous contact with the pipe body 1.

[0034] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A lined oil pipe, comprising a pipe body (1), characterized in that: The outer surface of the tube body (1) is provided with a spiral depression (2), the inner top end of the tube body (1) is provided with a connection groove (3), and the bottom end of the tube body (1) is fixedly mounted with a connection ring (4), the connection ring (4) being threadably matched with the connection groove (3).

2. The oil lined pipe according to claim 1, characterized in that: The inner wall of the tube body (1) is formed with a spiral protrusion (5) due to the spiral depression (2).

3. The oil lined pipe according to claim 2, characterized in that: The tooth top surface of the spiral protrusion (5) is coated with a wear-resistant coating (7), and the wear-resistant coating (7) is a silicon carbide ceramic coating.

4. The oil lined pipe according to claim 1, characterized in that: A limiting ring (6) is fixedly installed at the bottom end of the connecting groove (3) inside the tube body (1), and the distance between the top of the limiting ring (6) and the top surface of the tube body (1) is equal to the length of the connecting ring (4).

5. The oil lined pipe according to claim 1, characterized in that: The arc of the spiral depression (2) is 1 / 2 of a circle.

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