Casing pipe structure for oil and gas well

Abstract

The utility model relates to the technical field of oil-gas well casing pipes, and discloses a casing pipe structure for oil-gas wells, which comprises a pipe body and flanges, the flanges are fixed on the outer ring surface of the lateral side of the tail end of the pipe body in a surrounding manner, the flanges of the pipe body are connected and locked through bolts, and the outer side of the surface of one end face of the pipe body is uniformly and integrally connected with three first arc plates. Three first arc grooves are evenly formed in the outer side of the other end face of the pipe body, three second arc plates are evenly and integrally connected to the surface of the inner side of the pipe body at one ends of the first arc grooves, and three second arc grooves are evenly formed in the inner side of the other end face of the pipe body. According to the technical scheme, one end face of the joint of the pipe bodies is provided with the first arc groove and the second arc plate, the other end face of the joint of the pipe bodies is provided with the first arc plate and the second arc groove, during connection, the first arc plate is inserted into the first arc groove, the second arc plate is inserted into the second arc groove and then locked, and the effect of improving the connection strength of the joint of the pipe bodies is achieved; and the problem of bending or leakage is not easy to occur when the connecting part of the pipe body is stressed.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas well casings, in particular to a casing structure for oil and gas wells. Background Art

[0002] Oil and gas wells, also known as "production wells", are holes drilled in the formation according to a certain well layout system specifically for the extraction of underground oil or natural gas; or wells converted from other drilling wells for oil and gas extraction. Casing is generally run into the well, and cement is injected between the outer wall of the casing and the well wall to protect the well wall and seal the aquifer, isolating different oil layers; oil and gas pipes are also run into the casing. When used for oil extraction, it is called an "oil well"; when used for natural gas extraction, it is called a "natural gas well" or "gas well".

[0003] The connection of the casing is usually connected by flanges and bolts. When the connection is subjected to external force, the bolts and other connecting parts are easily stressed, thereby affecting the strength of the connection and easily causing leakage problems. Therefore, we propose a casing structure for oil and gas wells. Utility Model Content

[0004] The utility model aims to provide a casing structure for oil and gas wells, in which a first arc groove and a second arc plate are provided on one end face of a pipe body connection, and a first arc plate and a second arc groove are provided on the other end face. When connected, the first arc plate is inserted into the first arc groove, and the second arc plate is inserted into the second arc groove and then locked. This has the effect of increasing the connection strength of the pipe body connection, making it less likely for the pipe body connection to bend or leak when subjected to force, thereby solving the problems raised in the background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a casing structure for oil and gas wells, comprising a pipe body and a flange, wherein the flange is fixed around the outer ring surface on the side of the end of the pipe body, and the flanges at the connection of the pipe body are locked by bolt connection; three first arc plates are evenly connected to the outer side of the surface of one end face of the pipe body, three first arc grooves are evenly opened on the outer side of the other end face of the pipe body, and the first arc grooves are aligned with the first arc plates; three second arc plates are evenly connected to the inner side surface of the pipe body at one end of the first arc groove, and three second arc grooves are evenly opened on the inner side of the other end face of the pipe body, and the second arc plates are aligned with the second arc grooves.

[0006] By adopting the above technical solution, the tube bodies are connected and locked by flanges with long bolts. The first arc plate after connection is inserted into the first arc groove on the end face of the other tube body, and the second arc plate is inserted into the second arc groove, thereby achieving structural reinforcement of the tube body connection and avoiding bending or leakage when the connection is subjected to force.

[0007] Optionally, an annular groove is provided on the end surface of the tube body, and a sealing ring is fixed in the annular groove of one of the tube bodies.

[0008] By adopting the above technical solution, the sealing ring is pressed tightly between the annular grooves on the end faces of the tube body, thereby achieving a sealing effect on the connection between the tube body.

[0009] Optionally, the annular grooves on the two end faces of the tube body have the same size, and the annular grooves are circumferentially arranged in the middle of the end faces of the tube body.

[0010] By adopting the above technical solution, the annular groove can be smoothly pressed against the inner wall of the annular groove and sealed.

[0011] Optionally, a first rubber pad is fitted and fixed to the inner surface of the first arc groove, and the first arc plate is inserted into the first arc groove and pressed against the surface of the first rubber pad.

[0012] By adopting the above technical solution, the first arc plate is inserted into the first arc groove and pressed against the surface of the first rubber pad, thereby achieving a better anti-slip locking effect.

[0013] Optionally, a second rubber pad is fitted and fixed to the inner surface of the second arc groove, and the second arc plate is inserted into the second arc groove and pressed against the surface of the second rubber pad.

[0014] By adopting the above technical solution, the second arc plate is inserted into the second arc groove and pressed against the surface of the second rubber pad, thereby achieving a better anti-slip locking effect.

[0015] Optionally, a plurality of through holes are evenly formed on the surface of the flange, and the bolts pass through the flange through the through holes.

[0016] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0017] 1. The technical solution of the present application is to provide a first arc groove and a second arc plate on one end face of the connection of the tube body, and to provide a first arc plate and a second arc groove on the other end face. When connected, the first arc plate is inserted into the first arc groove, and the second arc plate is inserted into the second arc groove and then locked. This has the effect of increasing the connection strength of the connection of the tube body, so that the connection of the tube body is not prone to bending or leakage when subjected to force.

[0018] 2. The technical solution of the present application fixes the first rubber pad and the second rubber pad on the inner surfaces of the first arc groove and the second arc groove respectively. The first arc plate and the second arc plate are pressed against the inner surfaces of the first arc groove and the second arc groove through the first rubber pad and the second rubber pad, which can be locked more anti-slip. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0020] Figure 1 This is a schematic diagram of the overall structure of the casing structure for oil and gas wells of the utility model;

[0021] Figure 2 The utility model is a schematic diagram of the pipe body end surface structure of the casing structure for oil and gas wells.

[0022] In the figure: 1, tube body; 11, ring groove; 111, sealing ring; 2, flange; 21, through hole; 3, bolt; 4, first arc plate; 41, first arc groove; 411, first rubber pad; 5, second arc plate; 51, second arc groove; 511, second rubber pad. DETAILED DESCRIPTION

[0023] See also Figure 1-2 The utility model provides a technical solution: a casing structure for oil and gas wells, including a pipe body 1 and a flange 2. The flange 2 is fixed around the outer ring surface of the end side of the pipe body 1. A plurality of through holes 21 are evenly opened on the surface of the flange 2, so that the end faces of the pipe body 1 are aligned and tightly attached, and then bolts 3 are used to pass through the flange 2 through the through holes 21, and nuts are screwed on the ends of the bolts 3 and locked, which will pull the flange 2 and make the end face of the pipe body 1 tightly connected and locked.

[0024] The end surfaces of the tube body 1 are both provided with annular grooves 11. The annular grooves 11 on the two end surfaces of the tube body 1 are of the same size. The annular grooves 11 are arranged around the middle position of the end surfaces of the tube body 1. A sealing ring 111 is fixed in the annular groove 11 of one of the tube bodies 1. When the end surfaces of the tube body 1 are aligned and pressed tightly, the sealing ring 111 will press tightly against the inner wall of the annular groove 11 to achieve a sealing effect on the connecting end surfaces of the tube body 1.

[0025] Three first arc plates 4 are evenly connected to the outer side of the surface of one end surface of the tube body 1, and three first arc grooves 41 are evenly opened on the outer side of the other end surface of the tube body 1. The size of the first arc groove 41 is slightly larger than the size of the first arc plate 4, and a first rubber pad 411 is fitted and fixed on the inner surface of the first arc groove 41. The first arc groove 41 is aligned with the first arc plate 4, so that the first arc plate 4 can be inserted into the first arc groove 41 and pressed against the surface of the first rubber pad 411 after the tube body 1 is connected and locked, thereby obtaining an increased locking effect on the connection of the tube body 1.

[0026] The inner surface of the tube body 1 at one end of the first arc groove 41 is evenly connected with three second arc plates 5, and the inner side of the other end surface of the tube body 1 is evenly opened with three second arc grooves 51. The size of the first arc groove 41 is slightly larger than the size of the first arc plate 4, and a second rubber pad 511 is fitted and fixed on the inner surface of the second arc groove 51. The second arc plate 5 is aligned with the second arc groove 51, so that the second arc plate 5 can be inserted into the second arc groove 51 and pressed against the surface of the second rubber pad 511 after the tube body 1 is connected and locked, thereby increasing the locking effect on the connection of the tube body 1.

[0027] During use, when the tube bodies 1 are connected, the first arc plates 4 of the tube bodies 1 on both sides are aligned with the first arc groove 41, the second arc plates 5 are aligned with the second arc groove 51, and then they are brought close to each other, so that the first arc plate 4 is inserted into the first arc groove 41 and contacts the surface of the first rubber pad 411, and the second arc plate 5 is inserted into the second arc groove 51 and contacts the surface of the second rubber pad 511, and then the bolts 3 pass through the flanges 2 of the two tube bodies 1 through the through holes 21. After the nuts are tightened at the ends of the bolts 3, the end faces of the tube bodies 1 are aligned and locked, and the sealing rings 111 are pressed between the annular grooves 11 on the end faces of the two tube bodies 1 to achieve sealing of the connection of the tube bodies 1. In subsequent use, the first arc plate 4 and the second arc plate 5 are inserted into the first arc groove 41 and the second arc groove 51, which can share the force acting on the connection of the tube bodies 1 and increase the connection strength of the connection.

Claims

1. A casing structure for oil and gas wells, comprising a casing body (1) and a flange (2), characterized in that: The flange (2) is fixed around the outer ring surface of the side edge of the end of the pipe body (1), and the flanges (2) at the connection of the pipe body (1) are connected and locked by bolts (3); The outer side of one end surface of the tube body (1) is uniformly connected with three first arc plates (4), the outer side of the other end surface of the tube body (1) is uniformly provided with three first arc grooves (41), the first arc grooves (41) are aligned with the first arc plates (4), the inner side surface of the tube body (1) at one end of the first arc groove (41) is uniformly connected with three second arc plates (5), the inner side of the other end surface of the tube body (1) is uniformly provided with three second arc grooves (51), the second arc plates (5) are aligned with the second arc grooves (51).

2. The casing structure for oil and gas wells according to claim 1, characterized in that: An annular groove (11) is provided on the end surface of the tube body (1), wherein a sealing ring (111) is fixed in the annular groove (11) of the tube body (1).

3. The casing structure for oil and gas wells according to claim 2, characterized in that: The annular grooves (11) on the two end surfaces of the tube body (1) have the same size, and the annular groove (11) is arranged around the middle position of the end surface of the tube body (1).

4. The casing structure for oil and gas wells according to claim 1, characterized in that: A first rubber pad (411) is fitted and fixed to the inner surface of the first arc groove (41), and the first arc plate (4) is inserted into the first arc groove (41) and pressed against the surface of the first rubber pad (411).

5. The casing structure for oil and gas wells according to claim 1, characterized in that: A second rubber pad (511) is fitted and fixed to the inner surface of the second arc groove (51), and the second arc plate (5) is inserted into the second arc groove (51) and pressed against the surface of the second rubber pad (511).

6. The casing structure for oil and gas wells according to claim 1, characterized in that: The surface of the flange (2) is evenly provided with a plurality of through holes (21), and the bolts (3) pass through the flange (2) through the through holes (21).

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