Novel underground oil pipe heating device

Abstract

The utility model relates to the technical field of oil extraction equipment, in particular to a novel underground oil pipe heating device which comprises a sleeve sleeved on the outer side of an oil pipe, a heating coil is arranged in the sleeve, the heating coil is sleeved on the outer side of the oil pipe, the sleeve is as long as the oil pipe, and an internal thread is arranged at one end of the sleeve. Internal threads are arranged at one end of the sleeve, external threads are arranged at the other end of the sleeve, the internal threads are matched with the external threads, limiting holes are formed in the side wall of the sleeve in the direction perpendicular to the axis, the limiting holes are evenly distributed in the axial direction, limiting pieces are arranged in the limiting holes, and the limiting pieces penetrate into the limiting holes and can be blocked at the joint of an oil pipe and an oil pipe coupling. Compared with the prior art, when parts such as the heating coil or the sleeve in the technical scheme need to be disassembled and replaced, the sleeve can be pulled out from one end of the oil pipe only by taking the limiting piece out of the limiting hole, disassembly and maintenance are convenient, and the maintenance efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil production equipment, in particular to a novel downhole oil pipe heating device. Background Art

[0002] Petroleum is a fluid mineral buried deep underground. At present, in the actual exploitation process of oil wells in special oil and gas reservoirs such as heavy oil, high-viscosity oil and condensate gas, the sucker rods are often stuck or broken due to thick oil, wax deposition and excessive load, which seriously affects the output and recovery rate. Heating the oil pipe can improve the fluidity of crude oil and increase production.

[0003] The oil pipe is divided into the above-the-hole oil pipe and the downhole oil pipe. The heating of the downhole oil pipe is mainly to wrap the electric heating wire on the oil pipe, and indirectly heat the crude oil in the oil pipe by heating the oil pipe. In order to ensure that the electric heating wire is not corroded and aged underground, this electric heating wire heating method needs to wrap a layer of protective shell on the outside of the electric heating wire and seal the electric heating wire inside. In order to improve the protection ability of the protective shell to the electric heating wire, the protective shell and the oil pipe are usually welded and sealed. However, this method is not convenient for disassembly. When the electric heating wire is damaged and needs to be repaired, the maintenance personnel need to spend a lot of time to disassemble the oil pipe, which greatly reduces the maintenance efficiency of the electric heating wire.

[0004] Therefore, it is necessary to propose a new downhole oil pipe heating device to strengthen the protection of the heating wire while facilitating the disassembly and replacement of the heating wire and the protective shell, thereby improving the maintenance efficiency of the heating wire. Utility Model Content

[0005] The utility model aims to solve the problem that the existing downhole oil pipe electric heating wire is not easy to disassemble and replace, resulting in low maintenance efficiency, and now provides a new downhole oil pipe heating device.

[0006] The technical solution of the utility model is:

[0007] A novel downhole oil pipe heating device comprises a sleeve sleeved on the outside of the oil pipe, a heating coil is arranged in the sleeve, the heating coil is sleeved on the outside of the oil pipe, the length of the sleeve is the same as the length of the oil pipe, one end of the sleeve is provided with an internal thread, the other end of the sleeve is provided with an external thread, the internal thread and the external thread match each other, a limiting hole is provided on the side wall of the sleeve in a direction perpendicular to the axis, the limiting holes are evenly distributed axially, a limiting member is provided in the limiting hole, the limiting member penetrates into the limiting hole and can be blocked at the junction of the oil pipe and the oil pipe coupling.

[0008] Furthermore, a fixing frame is fixedly connected inside the sleeve, the fixing frame is arranged along the axial direction of the oil pipe, a fixing hole is provided on the fixing frame, and the heating coil is fixed in the fixing hole.

[0009] Furthermore, locking holes are provided around the fixing hole, and the heating coil is also provided with a locking hole. A locking piece is provided in the locking hole, and the locking piece fixes the heating coil in the fixing hole.

[0010] Furthermore, four limiting holes are respectively arranged at both ends of the sleeve, and a limiting member is correspondingly arranged in each limiting hole.

[0011] Furthermore, a fixing groove for accommodating the cable is fixedly connected to the inner wall of the sleeve, and the fixing groove is placed along the axial direction of the sleeve.

[0012] Furthermore, the two sleeves can be threadedly connected through internal threads and external threads thereon, and the coupling of the oil pipe is located at one end of the sleeve where the internal threads are located.

[0013] Furthermore, when the two sleeves are threadedly connected, the two oil pipes therein can also be connected via a coupling.

[0014] Furthermore, the diameter of one end of the sleeve where the internal thread is located is larger than the diameter of the oil pipe coupling.

[0015] Furthermore, a thread is provided in the limiting hole, and the limiting member is a screw.

[0016] The utility model discloses a novel downhole oil pipe heating device, in which the sleeve and the oil pipe have the same length. When the oil pipes are butt-jointed through the couplings thereon, the sleeve on the outside of the oil pipe can also be butt-jointed through the internal thread and external thread thereon, so that the oil pipe can be wrapped in the sleeve, thereby protecting the oil pipe. The limiting hole can accommodate a limiting member, and when the limiting member is inserted into the limiting hole, it can block the junction between the oil pipe and the oil pipe coupling to prevent the oil pipe from axially moving in an upright state. The limiting hole and the limiting member are provided at both ends of the sleeve, so both ends of the sleeve have a limiting function, thereby ensuring the limiting effect. Compared with the traditional technology, when the heating coil or sleeve and other components in the technical solution need to be disassembled and replaced, it is only necessary to take out the limiting member from the limiting hole to pull the sleeve out from one end of the oil pipe, which is convenient for disassembly and maintenance and improves the maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a three-dimensional diagram of the sleeve of the utility model;

[0018] Figure 2 This is the front view of the sleeve of the utility model;

[0019] Figure 3 For this utility model Figure 2 Sectional view at AA;

[0020] Figure 4 This is a three-dimensional diagram of the heating coil of the utility model;

[0021] Figure 5 This is a three-dimensional diagram of the fixing frame of the utility model;

[0022] Figure 6 This is a three-dimensional diagram of the combination of the fixing frame and the heating coil of the utility model;

[0023] Figure 7 This is a combined view of the sleeve of the utility model;

[0024] Figure 8 This is a reference diagram of the oil pipe structure of the utility model;

[0025] Fig. 9 For this utility model Figure 7 Cross-sectional view at BB in the middle.

[0026] Figure numerals: 1. sleeve; 2. heating coil; 3. fixing groove; 4. limiting hole; 5. oil pipe; 6. fixing frame; 7. fixing hole; 8. locking hole; 9. internal thread; 10. external thread; 11. limiting piece; 12. coupling. DETAILED DESCRIPTION

[0027] In order to make the technical means, technical features, utility model objectives and technical effects achieved by the utility model easy to understand, the utility model is further explained below with reference to specific illustrations.

[0028] Embodiment 1:

[0029] like Figure 1 and Figure 2 As shown, this embodiment provides a novel downhole oil pipe heating device, including a sleeve 1 sleeved on the outside of the oil pipe 5, a heating coil 2 is arranged in the sleeve 1, and the heating coil 2 is sleeved on the outside of the oil pipe 5, the length of the sleeve 1 is the same as the length of the oil pipe 5, one end of the sleeve 1 is provided with an internal thread 9, and the other end of the sleeve 1 is provided with an external thread 10, the internal thread 9 and the external thread 10 match each other, and a limiting hole 4 is opened on the side wall of the sleeve 1 in a direction perpendicular to the axis, the limiting holes 4 are evenly distributed axially, and a limiting member 11 is arranged in the limiting hole 4, and the limiting member 11 penetrates into the limiting hole 4 and can be blocked at the junction of the oil pipe 5 and the oil pipe 5 coupling 12.

[0030] Preferably, Figure 4 and Figure 5 As shown, a fixing frame 6 is screwed or welded inside the sleeve 1 , and the fixing frame 6 is arranged axially along the oil pipe 5 . A fixing hole 7 is provided on the fixing frame 6 , and the heating coil 2 is fixed in the fixing hole 7 .

[0031] Preferably, the fixing hole 7 is surrounded by locking holes 8. Figure 6As shown, the heating coil 2 is also provided with a locking hole 8, in which a locking piece is provided. The locking piece fixes the heating coil 2 in the fixing hole 7. Preferably, four locking holes 8 are provided on each fixing frame 6, and are axially distributed around the fixing hole 7. Preferably, the locking piece is a screw.

[0032] Preferably, four limiting holes 4 are respectively arranged at both ends of the sleeve 1, a limiting member 11 is correspondingly arranged in each limiting hole 4, and the limiting holes 4 are evenly distributed in the axial direction.

[0033] Preferably, Figure 3 As shown, a fixing groove 3 for accommodating a cable is welded or screwed on the inner wall of the sleeve 1 , and the fixing groove 3 is placed along the axial direction of the sleeve 1 .

[0034] Preferably, Figure 7 As shown, the two sleeves 1 can be threadedly connected through the internal threads 9 and the external threads 10 thereon, and the coupling 12 of the oil pipe 5 is located at one end of the sleeve 1 where the internal threads 9 are located.

[0035] Preferably, when the two sleeves 1 are threadedly connected, the two oil pipes 5 therein can also be connected via a coupling 12 .

[0036] Preferably, the diameter of one end of the sleeve 1 where the internal thread 9 is located is larger than the diameter of the coupling 12 of the oil pipe 5 .

[0037] Preferably, the limiting hole 4 is provided with a thread, and the limiting member 11 is a screw.

[0038] When working, Figure 8 and Fig. 9As shown, the sleeve 1 and the oil pipe 5 have the same length, and both the sleeve 1 and the oil pipe 5 are provided with threads. One end of the sleeve 1 with external threads 10 is also provided with external threads 10, and one end of the sleeve 1 with internal threads 9 is provided with internal threads 9 on the coupling 12 of the oil pipe 5. When the oil pipe 5 is threadedly connected, the sleeve 1 is also threadedly connected synchronously, so that the connection between the sleeves 1 and the connection between the oil pipes 5 are realized synchronously. When the oil pipes 5 are butt-jointed through the coupling 12 thereon, the sleeve 1 on the outside of the oil pipe 5 can also be butt-jointed through the internal threads 9 and the external threads 10 thereon, so that the oil pipe 5 can be wrapped in the sleeve 1, realizing For the protection of the oil pipe 5, the limit hole 4 can accommodate the limit member 11. When the limit member 11 is inserted into the limit hole 4, it can block the junction between the oil pipe 5 and the oil pipe 5 coupling 12 to prevent the oil pipe 5 from axial movement in the upright state. The limit hole 4 and the limit member 11 are arranged at both ends of the sleeve 1, so both ends of the sleeve 1 have a limiting function, which ensures the limiting effect. Compared with the traditional technology, when the heating coil 2 or sleeve 1 and other components in the technical solution need to be disassembled and replaced, it is only necessary to remove the limit member 11 from the limit hole 4, and the sleeve 1 can be pulled out from one end of the oil pipe 5, which is convenient for disassembly and maintenance, and improves the maintenance efficiency.

[0039] The above description is only a preferred embodiment of the utility model, and is not intended to limit the scope of implementation of the utility model. That is, all equivalent changes and modifications made according to the content of the patent application scope of the utility model should belong to the technical scope of the utility model.

Claims

1. A novel downhole oil pipe heating device, comprising a sleeve (1) sleeved on the outside of the oil pipe (5), a heating coil (2) being arranged in the sleeve (1), and the heating coil (2) being sleeved on the outside of the oil pipe (5), characterized in that: The length of the sleeve (1) is the same as that of the oil pipe (5); one end of the sleeve (1) is provided with an internal thread (9); the other end of the sleeve (1) is provided with an external thread (10); the internal thread (9) and the external thread (10) match each other; a limiting hole (4) is provided on the side wall of the sleeve (1) in a direction perpendicular to the axis; the limiting holes (4) are evenly distributed axially; a limiting member (11) is provided in the limiting hole (4); the limiting member (11) penetrates into the limiting hole (4) and can block the junction between the oil pipe (5) and the oil pipe (5) coupling (12).

2. A novel downhole oil pipe heating device according to claim 1, characterized in that: A fixing frame (6) is fixedly connected inside the sleeve (1), the fixing frame (6) is arranged axially along the oil pipe (5), a fixing hole (7) is provided on the fixing frame (6), and the heating coil (2) is fixed in the fixing hole (7).

3. A novel downhole oil pipe heating device according to claim 2, characterized in that: The fixing hole (7) is provided with locking holes (8) around it, and the heating coil (2) is also provided with a locking hole (8). A locking piece is provided in the locking hole (8), and the locking piece fixes the heating coil (2) in the fixing hole (7).

4. A novel downhole oil pipe heating device according to claim 1, characterized in that: Four limiting holes (4) are respectively arranged at two ends of the sleeve (1), and a limiting member (11) is correspondingly arranged in each limiting hole (4).

5. A novel downhole oil pipe heating device according to claim 1, characterized in that: A fixing groove (3) for accommodating a cable is fixedly connected to the inner wall of the sleeve (1), and the fixing groove (3) is placed along the axial direction of the sleeve (1).

6. A novel downhole oil pipe heating device according to claim 1, characterized in that: The two sleeves (1) can be threadedly connected via internal threads (9) and external threads (10) thereon, and the coupling (12) of the oil pipe (5) is located at one end of the sleeve (1) where the internal threads (9) are located.

7. A novel downhole oil pipe heating device according to claim 6, characterized in that: When the two sleeves (1) are threadedly connected, the two oil pipes (5) therein can also be connected via a coupling (12).

8. A novel downhole oil pipe heating device according to claim 6, characterized in that: The diameter of one end of the sleeve (1) where the internal thread (9) is located is greater than the diameter of the coupling (12) of the oil pipe (5).

9. The novel downhole oil pipe heating device according to claim 1 is characterized in that: The limiting hole (4) is provided with a thread, and the limiting member (11) is a screw.

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