Tubing coupling structure

Abstract

The utility model relates to the technical field of tubing couplings, in particular to a tubing coupling structure which is characterized in that conical barrels are fixedly connected to the inner walls of sleeves, and sealing rings are embedded in sliding grooves machined in the surfaces of the conical barrels. Then an operator inserts bolts into through holes machined in the two limiting blocks correspondingly, then a plurality of nuts are installed on the bolts, and when the surfaces of the nuts and the surfaces of the bolts are tightly attached to the surfaces of the limiting blocks on the two sides correspondingly, the two sleeves can be fixed through the limiting rings, so that the oil pipe and the connecting pipe can be disassembled at a high speed; and the two conical barrels are inserted into the two oil pipes, so that the surfaces of the two sealing rings abut against the inner walls in the two oil pipes, the conical barrels can be more conveniently subjected to center positioning, the situation that alignment cannot be conducted easily when an operator connects the conical barrels is not prone to occurring, and the conical barrels are more convenient to connect.

Description

Technical Field

[0001] The utility model relates to the technical field of oil pipe couplings, in particular to an oil pipe coupling structure. Background Art

[0002] The tubing coupling is a kind of oilfield drilling tool, mainly used for connecting tubing, mainly to solve the problem that existing couplings are prone to fatigue fracture due to stress concentration. The tubing coupling structure is: the tubing end is connected to the inner wall of the coupling body by a tapered thread, and the end of the coupling body is connected to the tubing by a flat thread with the same thread and pitch; it has the characteristics of alleviating the stress concentration at the root of the external thread of the tubing connected by a single tapered thread, is not prone to fatigue fracture, and has a good connection effect. It effectively prevents the occurrence of oil well tubing string breakage accidents.

[0003] For example, an anti-scaling oil pipe coupling structure with the authorization announcement number "CN204175198U" is made of a material with anti-fouling adsorption and retention, reducing the probability of crude oil impurities adsorbing and retaining; the anti-scaling bushing has two conical inner holes, and the special oil pipe is provided with a flange, and the inner and outer circles at the flanged pipe mouth are provided with chamfers: so that during the installation process of the bushing and the equipped special oil pipe, it can ensure that the inner lining oil pipe and the coupling are tightly matched, and if the inner lining oil pipe is deformed at the end after long-term use, it can still be well matched to avoid oil leakage. However, the anti-scaling oil pipe coupling structure is connected to the oil pipe through a conical internal thread, and the oil pipe needs to be rotated, making it difficult to quickly disassemble the oil pipe and the coupling, thereby reducing work efficiency. At the same time, the anti-scaling oil pipe coupling structure is not convenient for center positioning, which makes it easy for operators to be unable to align during connection, resulting in inconvenient connection. Utility Model Content

[0004] The utility model aims to solve the problem that when connecting with an oil pipe through a tapered internal thread, the oil pipe needs to be rotated, making it difficult to quickly disassemble the oil pipe and the coupling, thereby reducing work efficiency. At the same time, the anti-scaling oil pipe coupling structure is not convenient for center positioning, which makes it easy for operators to be unable to align during connection, resulting in inconvenient connection. A kind of oil pipe coupling structure is proposed.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A tubing coupling structure is designed, comprising an tubing. Auxiliary sealing mechanisms are provided on the surfaces of both tubings. A coupling mechanism is provided on the surface of the auxiliary sealing mechanism. The auxiliary sealing mechanism comprises a sleeve. A conical cylinder is fixedly connected to the inner wall of the sleeve. Sealing rings are embedded in sliding grooves processed on the surface of the conical cylinder.

[0007] Preferably, the inner wall of the sleeve fits with the surface of the oil pipe, and the surface of the tapered cylinder fits with the inner wall of the oil pipe.

[0008] Preferably, the coupling mechanism comprises a limiting ring and bolts, a plurality of limiting blocks are mounted on the surface of the limiting ring, and the bolts pass through the limiting blocks through through holes.

[0009] Preferably, the two sleeve surfaces are pressed tightly against each other, and the sealing ring surface is pressed tightly against the inner wall of the oil pipe.

[0010] Preferably, the bolt and the nut are connected by threads, and the surface of the limit ring is tightly pressed against the surfaces of the two sleeves.

[0011] The utility model proposes an oil pipe coupling structure, which has the beneficial effect of: through the cooperation of the oil pipe and the coupling mechanism, a limit ring is sleeved on the surfaces of two sleeves, and then the operator inserts the bolts into the through holes processed on the two limit blocks respectively, and when a plurality of nuts are installed on the bolts, when the nut surface and the bolt surface are respectively tightly fitted with the limit block surfaces on both sides, the limit ring can fix the two sleeves, so that the oil pipe and the connecting pipe can be disassembled quickly, thereby improving work efficiency.

[0012] Through the cooperation of the oil pipe and the sealing mechanism, the two tapered cylinders are inserted into the two oil pipes, so that the surfaces of the two sealing rings are pressed tightly against the inner walls of the two oil pipes. When the ends of the two oil pipes are tightly fitted with the surface of the strip sleeve, the pushing of the two sleeves is stopped to make it easier to center the tapered cylinder, so that the operator is not prone to misalignment during connection, making it more convenient to connect the tapered cylinders. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Figure 2 for Figure 1 A front cross-sectional view of

[0015] Figure 3 for Figure 1 A front view of the middle coupling mechanism;

[0016] Figure 4 for Figure 1 The right side view of the middle coupling mechanism in the relaxed state;

[0017] Figure 5 for Figure 2 A front view of the auxiliary sealing mechanism;

[0018] Figure 6 for Figure 2 Schematic diagram of the sealing mechanism in the middle.

[0019] In the figure: 1. oil pipe, 2. auxiliary sealing mechanism, 201. sleeve, 202. tapered cylinder, 203. sealing ring, 3. coupling mechanism, 301. limiting ring, 302. bolt, 303. limiting block, 304. nut. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings:

[0021] See attached Figure 1-6 In the present embodiment, a tubing coupling structure includes an tubing 1. Auxiliary sealing mechanisms 2 are provided on the surfaces of the two tubings 1. A coupling mechanism 3 is provided on the surface of the auxiliary sealing mechanisms 2. The auxiliary sealing mechanism 2 includes a sleeve 201. A conical cylinder 202 is fixedly connected to the inner wall of the sleeve 201. The conical cylinder 202 is hollow. The sliding grooves processed on the surface of the conical cylinder 202 are embedded with sealing rings 203. The sealing rings 203 can prevent oil leakage in the tubing 1. The inner wall of the sleeve 201 fits with the surface of the tubing 1, and the surface of the conical cylinder 202 fits with the inner wall of the tubing 1.

[0022] The coupling mechanism 3 includes a limit ring 301 and a bolt 302. A plurality of limit blocks 303 are installed on the surface of the limit ring 301. The bolt 302 passes through the limit block 303 through a through hole. The surfaces of the two sleeves 201 are pressed tightly, the surface of the sealing ring 203 is pressed tightly against the inner wall of the oil pipe 1, the bolt 302 and the nut 304 are connected by threads, the surface of the limit ring 301 is pressed tightly against the surfaces of the two sleeves 201, the limit ring 301 has a certain deformation ability and can form sufficient friction with the surface of the sleeve 201 to limit the position of the sleeve 201.

[0023] Working principle:

[0024] When coupling the tubing:

[0025] Sealing process:

[0026] First, insert the two tapered cylinders 202 into the two oil pipes 1 so that the surfaces of the two sealing rings 203 are pressed against the inner walls of the two oil pipes 1. When the ends of the two oil pipes 1 are tightly fitted with the surface of the sleeve 201, stop pushing the two sleeves 201 to prevent the oil in the oil pipe 1 from leaking out through the sealing ring 203, which makes it easier to center the tapered cylinder 202 and makes it less likely for the operator to misalign during connection, making it more convenient to connect the tapered cylinders.

[0027] Coupling process:

[0028] After the two sleeves 201 are installed, the two sleeves 201 are tightly fitted, and then the limit ring 301 is put on the surface of the two sleeves 201. Then the operator inserts the bolts into the through holes processed on the two limit blocks 303 respectively, and installs multiple nuts 304 on the bolts. When the surface of the nut 304 and the surface of the bolt 302 are tightly fitted with the surface of the limit blocks 303 on both sides respectively, the limit ring 301 can fix the two sleeves 201 and complete the coupling work. Through the cooperation of the bolt 302 and the nut 304, the sleeve 201 and the limit ring 301 can be quickly disassembled, thereby improving work efficiency.

[0029] Although the present invention has been shown and described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. An oil pipe coupling structure, comprising an oil pipe (1), characterized in that: The surfaces of the two oil pipes (1) are both provided with auxiliary sealing mechanisms (2), the surfaces of the auxiliary sealing mechanisms (2) are provided with coupling mechanisms (3), the auxiliary sealing mechanisms (2) comprise a sleeve (201), the inner wall of the sleeve (201) is fixedly connected with a conical cylinder (202), and the sliding grooves processed on the surface of the conical cylinder (202) are both embedded with sealing rings (203).

2. The oil pipe coupling structure according to claim 1, characterized in that: The inner wall of the sleeve (201) fits the surface of the oil pipe (1), and the surface of the conical cylinder (202) fits the inner wall of the oil pipe (1).

3. The oil pipe coupling structure according to claim 1, characterized in that: The coupling mechanism (3) comprises a limiting ring (301) and bolts (302); a plurality of limiting blocks (303) are mounted on the surface of the limiting ring (301); and the bolts (302) penetrate the limiting blocks (303) through through holes.

4. The oil pipe coupling structure according to claim 1, characterized in that: The surfaces of the two sleeves (201) are in close contact with each other, and the surface of the sealing ring (203) is in close contact with the inner wall of the oil pipe (1).

5. The oil pipe coupling structure according to claim 3, characterized in that: The bolt (302) and the nut (304) are connected via threads, and the surface of the limiting ring (301) is tightly pressed against the surfaces of the two sleeves (201).

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