Lining oil well pipe

Abstract

The utility model relates to the technical field of pipe manufacturing, in particular to a lining oil well pipe. The coupling comprises a coupling body, a first oil pipe, a second oil pipe, a first lining pipe, a second lining pipe and a lining ring, the lining ring is embedded in the coupling body, the first oil pipe and the second oil pipe are arranged at the two ends of the lining ring respectively and are in threaded connection with the coupling body, the first lining pipe is arranged in the first oil pipe, and the second lining pipe is arranged in the second oil pipe. The first lining pipe is arranged in the first oil pipe, the second lining pipe is arranged in the second oil pipe, the first lining pipe extends out of the first oil pipe, the second lining pipe extends out of the second oil pipe, and the outer wall of the extending first lining pipe, the outer wall of the first oil pipe, the outer wall of the extending second lining pipe and the outer wall of the second oil pipe are all attached to the inner wall of the lining ring; when the first oil pipe and the second oil pipe which are adjacent are in butt joint, a good sealing effect can be achieved, and oil leakage is prevented.

Description

Technical Field

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

[0002] As the exploitation depth of oil and gas fields continues to increase, higher exploitation temperatures are required, as well as high H2S, CO2, and Cl - The harsh corrosive environment makes the corrosion problem of oil pipes increasingly serious.

[0003] Non-metallic lined composite pipes have good anti-corrosion properties, but their main problem is that their temperature resistance level is usually low. In order to improve the temperature resistance of oil pipes, polyethylene lined composite pipes are widely used. However, the operating temperature of polyethylene lined composite pipes usually does not exceed 100 degrees Celsius, and the operating temperature of oil pipes needs to be improved.

[0004] Prior art CN205244639U discloses a high temperature resistant ultra-high molecular polyethylene oil pipe, comprising an ultra-high molecular polyethylene pipe substrate, a PI polyimide film is provided on the inner wall of the ultra-high molecular polyethylene pipe substrate, and a glass fiber film is provided on the outer wall of the ultra-high molecular polyethylene pipe substrate. However, when adjacent oil pipes are butt-jointed, the polyethylene oil pipe disclosed in the prior art has poor sealing performance and is prone to oil leakage.

[0005] Therefore, there is an urgent need to provide a lined oil well pipe that can improve the sealing performance of adjacent oil pipes when connected together compared to the prior art. Utility Model Content

[0006] The utility model solves the technical problems existing in the prior art and provides an inner-lined oil well pipe.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0008] A lined oil well pipe comprises a coupling body, a first oil pipe, a second oil pipe, a first liner pipe, a second liner pipe and a liner ring, wherein the liner ring is embedded in the coupling body, the first oil pipe and the second oil pipe are respectively arranged at two ends of the liner ring, the first oil pipe and the second oil pipe are both threadedly connected to the coupling body, the first liner pipe is arranged in the first oil pipe, the second liner pipe is arranged in the second oil pipe, the first liner pipe extends out of the first oil pipe, and the second liner pipe extends out of the second oil pipe, and the outer wall of the extended first liner pipe, the outer wall of the first oil pipe, the outer wall of the extended second liner pipe, and the outer wall of the second oil pipe are all in contact with the inner wall of the liner ring.

[0009] Furthermore, the portion of the first liner tube extending out of the first oil pipe is configured as a first flange, the first flange is truncated cone-shaped, and the outer wall of the first flange is in contact with the inner wall of the liner ring; the first liner tube and the second liner tube are made of perfluorinated material.

[0010] Furthermore, the portion of the second liner pipe extending out of the second oil pipe is configured as a second flange, the second flange is truncated cone-shaped, and the outer wall of the second flange is in contact with the inner wall of the liner ring.

[0011] Furthermore, the inner wall of the lining ring is integrally connected to the convex ring, and frustum surfaces are provided on both sides of the convex ring, one of the frustum surfaces is fitted with the outer wall of the first flange, and the other frustum surface is fitted with the outer wall of the second flange.

[0012] Furthermore, the first oil pipe includes a first cylindrical portion, a first conical portion and a second cylindrical portion which are integrally connected in sequence, the outer wall of the first conical portion close to the first cylindrical portion is threadedly connected to the coupling body, the outer wall of the first conical portion close to the second cylindrical portion is fitted with the inner wall of the inner liner ring, and the outer wall of the second cylindrical portion is fitted with the inner wall of the inner liner ring.

[0013] Furthermore, the second oil pipe includes a third cylindrical portion, a second conical portion and a fourth cylindrical portion which are integrally connected in sequence, the outer wall of the second conical portion close to the third cylindrical portion is threadedly connected to the coupling body, the outer wall of the second conical portion close to the fourth cylindrical portion is fitted with the inner wall of the liner ring, and the outer wall of the fourth cylindrical portion is fitted with the inner wall of the liner ring.

[0014] Furthermore, the inner wall of the inner lining ring is provided with two first arcuate surfaces and two second arcuate surfaces, the two first arcuate surfaces are respectively arranged at the two ends of the convex ring, and the two second arcuate surfaces are also respectively arranged at the two ends of the convex ring, the two first arcuate surfaces are respectively fitted with the outer wall of the second cylindrical part and the outer wall of the fourth cylindrical part, and the two second arcuate surfaces are respectively fitted with the outer wall of the first frustum part close to the second cylindrical part and the outer wall of the second frustum part close to the fourth cylindrical part; the inner lining ring is made of rubber or plastic material.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] (1) In the utility model, the outer wall of the first inner liner tube extending out of the first oil pipe, the outer wall of the first oil pipe, the outer wall of the second inner liner tube extending out of the second oil pipe, and the outer wall of the second oil pipe are all arranged in close contact with the inner wall of the inner liner ring. The inner liner ring can play a good sealing role when the adjacent first oil pipe and second oil pipe are connected to each other to prevent oil leakage.

[0017] (2) The first inner liner tube and the second inner liner tube of the utility model are made of perfluorinated material and have stronger temperature resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0019] Description of reference numerals:

[0020] 1. Coupling body; 11. Internal threaded portion; 12. Groove; 2. First oil pipe; 21. First cylindrical portion; 22. First truncated cone portion; 23. Second cylindrical portion; 3. Second oil pipe; 31. Third cylindrical portion; 32. Second truncated cone portion 32; 33. Fourth cylindrical portion; 4. Inner liner ring; 41. Convex ring; 42. First arcuate surface; 43. Second arcuate surface; 5. First inner liner pipe; 6. Second inner liner pipe; 7. First flange; 8. Second flange. DETAILED DESCRIPTION

[0021] The technical solution of the utility model will be clearly described below in conjunction with the accompanying drawings. Obviously, the described embodiments are not all embodiments of the utility model. All other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the utility model. It should be noted that the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", etc. is based on the orientation or position relationship shown in the accompanying drawings. It is only for the convenience of describing the utility model and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0022] like Figure 1 As shown, the utility model provides a lined oil well pipe, including a coupling body 1, a first oil pipe 2, a second oil pipe 3, a first liner pipe 5, a second liner pipe 6 and a liner ring 4, the liner ring 4 is embedded in the coupling body 1, the first oil pipe 2 and the second oil pipe 3 are threadedly connected inside the coupling body 1, the first oil pipe 2 and the second oil pipe 3 are arranged at both ends of the liner ring 4, the first liner pipe 5 is arranged inside the first oil pipe 2, the second liner pipe 6 is arranged inside the second oil pipe 3, the first liner pipe 5 extends out of the first oil pipe 2, the second liner pipe 6 extends out of the second oil pipe 3, the outer wall of the first liner pipe 5 extending out of the first oil pipe 2, the outer wall of the first oil pipe 2 close to the second oil pipe 3, the second liner pipe 6 extends out of the second oil pipe 3, and the outer wall of the second oil pipe 3 close to the first oil pipe 2 are all fitted with the liner ring 4, and the first liner pipe 5 and the second liner pipe 6 are made of perfluorinated material.

[0023] The inner wall of the coupling body 1 is provided with two internal threaded parts 11 and a groove 12. The two internal threaded parts 11 are arranged at both ends of the groove 12. The inner diameters of the two internal threaded parts 11 gradually increase from the end close to the groove 12 to the end away from the groove 12. The first oil pipe 2 is threadedly connected with an internal threaded part 11 arranged in the coupling body 1, and the second oil pipe 3 is threadedly connected with another internal threaded part 11 arranged inside the coupling body 1. The inner lining ring 4 is embedded in the groove 12, and the inner lining ring 4 is made of rubber material or plastic material.

[0024] The first oil pipe 2 includes a first cylindrical portion 21, a first truncated cone portion 22 and a second cylindrical portion 23 which are connected in sequence as a whole. The outer diameter of the first cylindrical portion 21 is the same as the outer diameter of the large diameter end of the first truncated cone portion 22, and the outer diameter of the second cylindrical portion 23 is the same as the outer diameter of the small diameter end of the first truncated cone portion 22; the second oil pipe 3 includes a third cylindrical portion 31, a second truncated cone portion 32 and a fourth cylindrical portion 33 which are connected in sequence as a whole. The third cylindrical portion 31 is the same as the outer diameter of the large diameter end of the second truncated cone portion 32, and the fourth cylindrical portion 33 is the same as the outer diameter of the small diameter end of the second truncated cone portion 32; the second cylindrical portion 23 and the fourth cylindrical portion 33 are arranged opposite to each other; the outer wall of the first truncated cone portion 22 close to the first cylindrical portion 21 is threadedly connected to an internal threaded portion 11 arranged inside the coupling body 1, and the outer wall of the second truncated cone portion 32 close to the third cylindrical portion 31 is threadedly connected to another internal threaded portion 11 arranged inside the coupling body 1.

[0025] The portion of the first inner liner tube 5 extending out of the first oil pipe 2 is set as a first flange 7, the first flange 7 is arranged close to the second oil pipe 3, the first flange 7 is integrally connected to the first inner liner tube 5, and the first flange 7 is extended toward the outside of the first inner liner tube 5 along the radial direction of the first inner liner tube 5; the portion of the second inner liner tube 6 extending out of the second oil pipe 3 is set as a second flange 8, the second flange 8 is arranged close to the first oil pipe 2, the second flange 8 is integrally connected to the second inner liner tube 6, and the second flange 8 is extended toward the outside of the second inner liner tube 6 along the radial direction of the second inner liner tube 6; the first flange 7 and the second flange 8 are both frustoconical, and the small diameter end of the first flange 7 and the small diameter end of the second flange 8 are arranged opposite to each other; the first inner liner tube 5 and the first oil pipe 2 are connected by interference fit, and the second inner liner tube 6 and the second oil pipe 3 are also connected by interference fit.

[0026] The inner wall of the inner liner ring 4 is integrally connected to the convex ring 41, and the convex ring 41 is arranged in the middle position of the inner wall of the inner liner ring 4. The cross-section of the convex ring 41 along the axial direction is trapezoidal. Conical surfaces are arranged on both sides of the convex ring 41, and the inner diameters of the conical surfaces gradually decrease from one end close to the convex ring 41 to the end away from the convex ring 41. The inner wall of the inner liner ring 4 is also provided with two first arc surfaces 42 and two second arc surfaces 43. The two first arc surfaces 42 are respectively arranged at both ends of the convex ring 41, and the two second arc surfaces 43 are also respectively arranged at both ends of the convex ring 41. The two first arc surfaces 42 are arranged between the two second arc surfaces 43. The first arc surface 42 is a cylindrical surface, and the second arc surface 43 is a conical surface. The inner diameter of the second arc surface 43 gradually decreases from one end close to the convex ring 41 to the end away from the convex ring 41.

[0027] The outer wall of the first flange 7 is in contact with the conical surface on one side of the convex ring 41, the outer wall of the second flange 8 is in contact with the conical surface on the other side of the convex ring 41, the outer wall of the second cylindrical portion 23 of the first oil pipe 2 is in contact with the first arcuate surface 42 on one side of the convex ring 41, the outer wall of the fourth cylindrical portion 33 of the second oil pipe 3 is in contact with the second arcuate surface 43 on the other side of the convex ring 41, the outer wall of the first conical portion 22 of the first oil pipe 2 close to the second cylindrical portion 23 is in contact with the second arcuate surface 43 on one side of the convex ring 41, and the outer wall of the second conical portion 32 of the second oil pipe 3 close to the fourth cylindrical portion 33 is in contact with the second arcuate surface 43 on the other side of the convex ring 41.

[0028] The utility model provides a lined oil well pipe, in which the outer wall of the first flange 7, the outer wall of the first oil pipe 2 close to the first flange 7, the outer wall of the second flange 8, and the outer wall of the second oil pipe 3 close to the second flange 8 are all fitted with the inner wall of the lining ring 4. The lining ring can play a good sealing role to prevent oil leakage when the adjacent first oil pipes 2 and second oil pipes 3 are connected. At the same time, the first lining pipe 5 and the second lining pipe 6 are made of perfluorinated material and have stronger temperature resistance.

[0029] Finally, it should be noted that the above content is only used to illustrate the technical solution of the utility model, rather than to limit the protection scope of the utility model. Simple modifications or equivalent substitutions of the technical solution of the utility model by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the utility model.

Claims

1. A lined oil well pipe, characterized in that: It includes a coupling body, a first oil pipe, a second oil pipe, a first inner liner pipe, a second inner liner pipe and an inner liner ring, the inner liner ring is embedded in the coupling body, the first oil pipe and the second oil pipe are respectively arranged at two ends of the inner liner ring, the first oil pipe and the second oil pipe are both threadedly connected to the coupling body, the first inner liner pipe is arranged in the first oil pipe, the second inner liner pipe is arranged in the second oil pipe, the first inner liner pipe extends out of the first oil pipe, and the second inner liner pipe extends out of the second oil pipe, and the outer wall of the extended first inner liner pipe, the outer wall of the first oil pipe, the outer wall of the extended second inner liner pipe, and the outer wall of the second oil pipe are all in contact with the inner wall of the inner liner ring.

2. The lined oil well pipe according to claim 1, characterized in that: The portion of the first liner tube extending out of the first oil pipe is configured as a first flange, the first flange is truncated cone-shaped, and the outer wall of the first flange is in contact with the inner wall of the liner ring; the first liner tube and the second liner tube are made of perfluorinated material.

3. The lined oil well pipe according to claim 2, characterized in that: The portion of the second liner tube extending out of the second oil pipe is configured as a second flange, the second flange is truncated cone-shaped, and the outer wall of the second flange is in contact with the inner wall of the liner ring.

4. The lined oil well pipe according to claim 3, characterized in that: The inner wall of the lining ring is integrally connected to the convex ring, and frustum surfaces are provided on both sides of the convex ring, one of the frustum surfaces is in contact with the outer wall of the first flange, and the other frustum surface is in contact with the outer wall of the second flange.

5. The lined oil well pipe according to claim 4, characterized in that: The first oil pipe includes a first cylindrical portion, a first conical portion and a second cylindrical portion which are integrally connected in sequence, the outer wall of the first conical portion close to the first cylindrical portion is threadedly connected to the coupling body, the outer wall of the first conical portion close to the second cylindrical portion is fitted with the inner wall of the inner liner ring, and the outer wall of the second cylindrical portion is fitted with the inner wall of the inner liner ring.

6. The lined oil well pipe according to claim 5, characterized in that: The second oil pipe includes a third cylindrical portion, a second conical portion and a fourth cylindrical portion which are integrally connected in sequence, the outer wall of the second conical portion close to the third cylindrical portion is threadedly connected to the coupling body, the outer wall of the second conical portion close to the fourth cylindrical portion is fitted with the inner wall of the inner liner ring, and the outer wall of the fourth cylindrical portion is fitted with the inner wall of the inner liner ring.

7. The lined oil well pipe according to claim 6, characterized in that: The inner wall of the inner lining ring is provided with two first arcuate surfaces and two second arcuate surfaces, the two first arcuate surfaces are respectively arranged at the two ends of the convex ring, and the two second arcuate surfaces are also respectively arranged at the two ends of the convex ring, the two first arcuate surfaces are respectively fitted with the outer wall of the second cylindrical part and the outer wall of the fourth cylindrical part, and the two second arcuate surfaces are respectively fitted with the outer wall of the first frustum part close to the second cylindrical part and the outer wall of the second frustum part close to the fourth cylindrical part; the inner lining ring is made of rubber or plastic material.

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