Heat insulation oil pipe with special buckle

Abstract

The utility model relates to a heat insulation oil pipe with a special buckle. According to the technical scheme, a heat insulation layer of an annular cavity is formed between an outer-layer pipe and an inner-layer pipe, the outer ends of the heat insulation layer are connected through a coupling, an anti-torque table is arranged in the center of the inner wall of a coupling body of the coupling, second coupling internal threads are arranged on the two sides of the anti-torque table respectively, and the anti-torque table is connected and matched with the outer threads of the inner-layer pipe through the second coupling internal threads; the outer sides of the second coupling internal threads are provided with first coupling internal threads respectively, and the first coupling internal threads are connected and matched with outer-layer pipe external threads on the outer-layer pipe. The utility model has the beneficial effects that the outer-layer pipe and the inner-layer pipe are welded together, the heat insulation layer of the annular cavity is formed by the outer-layer pipe and the inner-layer pipe to realize heat insulation, the internal threads are processed on the inner wall of the coupling, the thread form adopts a buttress buckle shape, and the anti-torsion table of the coupling is tightly matched with the end surface of the inner-layer pipe, so that the anti-torsion effect is good. The first retaining slope is tightly matched with the end face of the outer-layer pipe, so that the sealing device has the advantages of being good in sealing effect, high in connecting strength, anti-sticking, high in well descending speed and the like.

Description

Technical Field

[0001] This utility model relates to the field of petroleum machinery technology, and in particular to a special type of heat-insulating oil pipe. Background Technology

[0002] In oil extraction technology, insulated tubing is one of the essential downhole tools for steam injection. Insulated tubing offers excellent insulation, reducing heat loss from the well. It typically consists of a double-layer concentric tubing string structure, with the annular space between the two layers filled with insulating material, inert gas, or a vacuum. However, the interface between the insulated tubing layers can easily affect the insulation effect. Current technology usually connects the outer layer of the insulated tubing with an insulated coupling, generally using API standard threads. API standard threads have disadvantages such as low connection strength, poor sealing performance, slow downhole speed, and a tendency for threads to stick. Utility Model Content

[0003] The purpose of this utility model is to address the aforementioned deficiencies in the existing technology by providing a special heat-insulating oil pipe with advantages such as good sealing effect, high torsion resistance, anti-sticking, and fast downhole speed.

[0004] The present invention discloses a special heat-insulating oil pipe, the technical solution of which is as follows: it includes an outer tube (1) and an inner tube (2). The outer tube (1) is fitted on the outer wall of the inner tube (2), and the outer end of the outer tube (1) is welded and fixed to the outer wall of the inner tube (2). A heat-insulating layer (6) with an annular cavity is formed between the outer tube (1) and the inner tube (2). The outer ends of the outer tube (1) and the inner tube (2) are connected by a coupling (3). The coupling (3) includes a coupling body (3.1), an anti-torsion platform (3.2), and a coupling first... The coupling body (3.1) has an internal thread (3.3) and a second internal thread (3.4). The center of the inner wall of the coupling body (3.1) is provided with an anti-torsion platform (3.2). The two sides of the anti-torsion platform (3.2) are respectively provided with the second internal thread (3.4). The second internal thread (3.4) is connected and engaged with the outer thread (2.1) of the inner tube. The outer side of the second internal thread (3.4) is provided with a first internal thread (3.3). The first internal thread (3.3) is connected and engaged with the outer thread (4.2) of the outer tube (1).

[0005] Preferably, the inner diameter of the first internal thread (3.3) of the coupling is larger than the inner diameter of the second internal thread (3.4) of the coupling, and a first retaining slope (3.6) is provided between the first internal thread (3.3) and the second internal thread (3.4) of the coupling, so as to block the welded part (5) at the end of the outer tube (1).

[0006] Preferably, the inner diameter of the anti-twist platform (3.2) is smaller than the inner diameter of the second inner thread (3.4) of the coupling, and the two ends of the anti-twist platform (3.2) are in contact with the inner layer pipe end face (2.2) of the end of the inner layer pipe (2).

[0007] Preferably, the outer end of the outer layer pipe (1) is provided with an outer layer pipe thickened end (4), the outer end of the outer layer pipe thickened end (4) is provided with an outer layer pipe outer thread (4.2), the inner side of the outer layer pipe outer thread (4.2) forms an outer layer pipe step face (4.1) for being in contact with a coupling end face (3.5) formed at the outer end of the first inner thread (3.3) of the coupling (3).

[0008] Preferably, the outer end of the outer layer pipe thickened end (4) is provided with an outer layer pipe end face (4.3), and the outer layer pipe thickened end (4) is welded and fixed with the outer wall of the inner layer pipe (2).

[0009] Preferably, the outer end of the inner layer pipe (2) is provided with an inner layer pipe end face (2.2), and the outer wall of the inner layer pipe (2) is provided with an inner layer pipe outer thread (2.1) in the shape of a buttress thread.

[0010] Preferably, the first inner thread (3.3), the second inner thread (3.4) and the outer layer pipe outer thread (4.2) are all in the shape of a buttress thread.

[0011] The outer layer pipe and the inner layer pipe are welded together, the outer layer pipe and the inner layer pipe form a heat insulation layer of an annular cavity to realize heat insulation and form a heat insulation oil pipe. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a connection schematic diagram of the utility model;

[0013] Figure 2 is a schematic diagram of the inner layer pipe and the outer layer pipe after welding;

[0014] Figure 3 is a structural schematic diagram of the coupling;

[0015] Figure 4 is a local enlarged schematic diagram of the connection of the inner layer pipe and the outer layer pipe;

[0016] Figure 5 is a local enlarged schematic diagram of the coupling;

[0017] Figure 6is a magnified schematic view of the tooth profile of the coupling first internal thread and the coupling second internal thread;

[0018] Figure 7 is a magnified schematic view of the tooth profile of the inner layer pipe external thread and the outer layer pipe external thread;

[0019] In the above figure: outer layer pipe 1, inner layer pipe 2, coupling 3, outer layer pipe thickened end 4, welding part 5, heat insulation layer 6, inner layer pipe external thread 2.1, inner layer pipe end face 2.2, outer layer pipe step face 4.1, outer layer pipe external thread 4.2, outer layer pipe end face 4.3, coupling body 3.1, anti-torsion platform 3.2, coupling first internal thread 3.3, coupling second internal thread 3.4, coupling end face 3.5, first slope blocking part 3.6. DETAILED DESCRIPTION

[0020] The preferred embodiments of the utility model will be described below in conjunction with the accompanying drawings, and it should be understood that the preferred embodiments described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model.

[0021] Embodiment 1, refer to Figures 1-7 The utility model discloses a special buckle heat insulation oil pipe, including outer layer pipe 1 and inner layer pipe 2, the outer wall of inner layer pipe 2 is equipped with outer layer pipe 1, and the outer end of outer layer pipe 1 is welded and fixed with the outer wall of inner layer pipe 2, the heat insulation layer 6 of annular cavity is formed between outer layer pipe 1 and inner layer pipe 2, wherein, the outer end of outer layer pipe 1 and inner layer pipe 2 is connected through coupling 3, the coupling 3 includes coupling body 3.1, anti-torsion platform 3.2, coupling first internal thread 3.3, coupling second internal thread 3.4, the inner wall center of coupling body 3.1 is equipped with anti-torsion platform 3.2, and the two sides of anti-torsion platform 3.2 are equipped with coupling second internal thread 3.4 respectively, and are connected and cooperate through coupling second internal thread 3.4 and inner layer pipe external thread 2.1;The outer side of coupling second internal thread 3.4 is equipped with coupling first internal thread 3.3 respectively, and is connected and cooperates through coupling first internal thread 3.3 and outer layer pipe external thread 4.2 on outer layer pipe 1.

[0022] Refer to Figure 3 The inner diameter of the coupling first internal thread 3.3 mentioned in the utility model is greater than the inner diameter of the coupling second internal thread 3.4, and the first slope blocking part 3.6 is arranged between the coupling first internal thread 3.3 and the coupling second internal thread 3.4, and the welding part 5 of the end of the outer layer pipe 1 is blocked through the first slope blocking part 3.6.

[0023] The inner diameter of the anti-torsion platform 3.2 is less than the inner diameter of the coupling second internal thread 3.4, and the two ends of the anti-torsion platform 3.2 contact the inner layer pipe end face 2.2 of the end of the inner layer pipe 2.

[0024] Refer to Figure 4The outer end of the outer layer pipe 1 is provided with an outer layer pipe thickened end 4, and the outer end of the outer layer pipe thickened end 4 is provided with an outer layer pipe outer thread 4.2.

[0025] The outer end of the outer layer pipe thickened end 4 is provided with an outer layer pipe end face 4.3, and the outer layer pipe thickened end 4 is welded and fixed with the outer wall of the inner layer pipe 2.

[0026] Referring to Figure 4 The outer end of the inner layer pipe 2 is provided with an inner layer pipe end face 2.2, and the outer wall of the inner layer pipe 2 is provided with an inner layer pipe outer thread 2.1 in the shape of a bias trapezoidal buckle.

[0027] The outer layer pipe outer thread 4.2, the inner layer pipe outer thread 2.1 and the bias trapezoidal buckle-shaped first inner thread 3.3 and second inner thread 3.4 of the coupling 3 are respectively in the shape of a bias trapezoidal buckle.

[0028] The pipe end of the outer layer pipe 1 is thickened, the outer layer pipe 1 and the inner layer pipe 2 are welded together, and the heat insulation layer 6 formed by the two in the shape of a ring cavity can be used to realize heat insulation by vacuumizing to form a heat insulation oil pipe. The outer surface of the outer layer pipe 1 is provided with the outer layer pipe outer thread 4.2, the outer surface of the inner layer pipe 2 is provided with the inner layer pipe outer thread 2.1, the inner wall of the coupling 3 is provided with the first inner thread 3.3 and the second inner thread 3.4, the inner diameter of the first inner thread 3.3 is larger than that of the second inner thread 3.4, the first inner thread 3.3 and the second inner thread 3.4 are provided with the first slope 3.6, the thread of the above-mentioned thread is in the shape of a non-standard bias trapezoidal buckle, is used to connect and cooperate with the outer layer pipe outer thread 4.2 and the inner layer pipe outer thread 2.1, and is tightly matched with the end face of the inner layer pipe 2 through the anti-torsion table 3.2 of the coupling 3 and is tightly matched with the end face of the outer layer pipe 1 through the first slope 3.6, so that the effective and rapid connection of the heat insulation oil pipe is realized, and the heat insulation oil pipe has the advantages of good sealing effect, high connection strength, anti-sticking buckle, fast downhole speed and the like.

[0029] The utility model discloses a special buckle heat -insulating oil pipe, including outer tube 1 and inner tube 2, the outer wall of inner tube 2 is equipped with outer tube 1, and the outer end of outer tube 1 is welded with the outer wall of inner tube 2 and fixes, the heat -insulating layer 6 of annular cavity is formed between outer tube 1 and inner tube 2, wherein, the outer end of outer tube 1 and inner tube 2 is connected through coupling 3, coupling 3 includes coupling body 3.1, anti -twist platform 3.2, coupling first internal thread 3.3, coupling second internal thread 3.4, the inner wall center of coupling body 3.1 is equipped with anti -twist platform 3.2, and both sides of anti -twist platform 3.2 are equipped with coupling second internal thread 3.4 respectively, and are connected with the cooperation of coupling second internal thread 3.4 and inner tube outer thread 2.1, the outside of coupling second internal thread 3.4 is equipped with coupling first internal thread 3.3 respectively, and is connected with the cooperation of coupling first internal thread 3.3 and the outer layer pipe outer thread 4.2 on outer tube 1.

[0030] The difference from example 1 is:

[0031] The inert gas is placed in the heat -insulating layer 6 of annular cavity between outer tube 1 and inner tube 2 to realize heat -insulation, in addition, inner tube outer thread 2.1, outer layer pipe outer thread 4.2 and coupling first internal thread 3.3, coupling second internal thread 3.4 can also adopt other shapes of tooth shape, and the connecting purpose of the utility model can also be realized.

[0032] The above, only is the preferred embodiment of the utility model, and any familiar with the technical personnel in the art can utilize the technical scheme of the above -mentioned to modify the utility model or modify it as equivalent technical scheme. Therefore, any simple modification or equivalent transformation according to the technical scheme of the utility model is within the scope of the utility model claimed.

Claims

1. A special buckle heat insulation oil pipe, comprising an outer layer pipe (1) and an inner layer pipe (2), the outer layer pipe (1) is sleeved on the outer wall of the inner layer pipe (2), and the outer end of the outer layer pipe (1) is welded and fixed with the outer wall of the inner layer pipe (2), a heat insulation layer (6) of annular cavity is formed between the outer layer pipe (1) and the inner layer pipe (2), characterized in that: The outer layer pipe (1) and the outer end of the inner layer pipe (2) are connected through a coupling (3), the coupling (3) comprises a coupling body (3.1), an anti-torque platform (3.2), a coupling first internal thread (3.3), and a coupling second internal thread (3.4), the inner wall center of the coupling body (3.1) is provided with the anti-torque platform (3.2), the two sides of the anti-torque platform (3.2) are respectively provided with the coupling second internal thread (3.4), and the coupling second internal thread (3.4) is connected and matched with the inner layer pipe external thread (2.1); the outer side of the coupling second internal thread (3.4) is respectively provided with the coupling first internal thread (3.3), and the coupling first internal thread (3.3) is connected and matched with the outer layer pipe external thread (4.2) on the outer layer pipe (1). ​ 2. The special buckle heat-insulated oil pipe according to claim 1, characterized in that: The inner diameter of the coupling first internal thread (3.3) is greater than the inner diameter of the coupling second internal thread (3.4), and a first slope blocking portion (3.6) is arranged between the coupling first internal thread (3.3) and the coupling second internal thread (3.4), so as to block the welding portion (5) of the end portion of the outer layer pipe (1).

3. The special bucking insulated tubing as claimed in claim 2, characterized in that: The inner diameter of the anti-torque platform (3.2) is smaller than the inner diameter of the coupling second internal thread (3.4), and the two ends of the anti-torque platform (3.2) are in contact with the inner layer pipe end face (2.2) of the end portion of the inner layer pipe (2).

4. The special bucking insulated tubing as claimed in claim 3, characterized in that: The outer end portion of the outer layer pipe (1) is provided with an outer layer pipe thickened end (4), the outer end of the outer layer pipe thickened end (4) is provided with an outer layer pipe external thread (4.2), the inner side of the outer layer pipe external thread (4.2) forms an outer layer pipe step surface (4.1), which is used for being in contact with a coupling end surface (3.5) formed by the outer end portion of the coupling first internal thread (3.3) of the coupling (3).

5. The special bucking insulated tubing as claimed in claim 4, characterized in that: The outer end of the outer layer pipe thickened end (4) is provided with an outer layer pipe end surface (4.3), and the outer layer pipe thickened end (4) is welded and fixed with the outer wall of the inner layer pipe (2).

6. The special buckle insulated oil pipe according to claim 1, characterized in that: The outer end of the inner layer pipe (2) is provided with an inner layer pipe end surface (2.2), and the outer wall of the inner layer pipe (2) is provided with an inner layer pipe external thread (2.1) in the shape of a buttress thread.

7. The special bucking insulated tubing as claimed in claim 1, characterized in that: The coupling first internal thread (3.3), the coupling second internal thread (3.4), and the outer layer pipe external thread (4.2) are respectively in the shape of a buttress thread.

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