New energy oil and gas field downhole eddy current heater

Abstract

The utility model discloses a new energy oil and gas field downhole magnetic eddy current heater, comprising an oil pipe and a sucker rod, wherein the sucker rod is located in the oil pipe and reciprocates in the oil pipe, and relatively movable permanent magnets and magnetic eddy current heating copper tubes are arranged between the oil pipe and the sucker rod for generating magnetic eddy currents to generate heat. The new energy oil and gas field downhole magnetic eddy current heater can safely heat the produced fluid without any additional electric energy or thermal energy equipment, is safe and reliable, has low investment cost, does not require complicated operation and maintenance, and greatly improves the convenience of use.

Description

Technical Field

[0001] The utility model relates to the technical field of underground mining of oil and gas fields, in particular to an underground magnetic eddy current heater for new energy oil and gas fields. Background Art

[0002] The produced fluid from oilfield production wells contains oil, gas, water, sand, and a mixture that are extracted from the oil wells at the same time, transported to the metering room through pipelines, and then transferred to the transfer station and joint station for separation and treatment. A heating hot water pipeline is installed from the transfer station to each wellhead. The hot water in the heating pipeline is mixed with the produced material at the wellhead to increase the temperature, and then transported to the metering room and then to the transfer station for separation.

[0003] Due to the large investment in the construction of heat tracing pipelines and the difficulty of subsequent maintenance, the heat tracing pipelines next to the produced fluid transportation pipelines between some production wells in the oil field and the transfer station have been cancelled, and electric heating devices are used at the wellhead to directly heat or heat the produced fluid for transportation. The heating method mostly uses electrical energy or thermal energy for heating, but both electrical energy and thermal energy require related equipment, occupy a large space, have low safety, and are relatively costly. Summary of the invention

[0004] The technical problem to be solved by the utility model is to overcome the existing defects and provide a new energy oil and gas field downhole magnetic eddy current heater, which can safely heat the produced fluid without the need for any additional electrical or thermal energy equipment, and can effectively solve the problems in the background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a new energy oil and gas field downhole magnetic eddy current heater, comprising an oil pipe and a sucker rod, the sucker rod is located in the oil pipe and reciprocates in the oil pipe, and a relatively movable permanent magnet and a magnetic eddy current heating copper tube are arranged between the oil pipe and the sucker rod to generate magnetic eddy currents and generate heat.

[0006] As a preferred technical solution of the utility model, the permanent magnets are fixed in sequence in the oil pipe, and the magnetic eddy current heating copper tube is sleeved on the outside of the sucker rod.

[0007] As a preferred technical solution of the utility model, the permanent magnets are fixed in sequence on the outside of the sucker rod, and the magnetic eddy current heating copper tube is fixed in the oil pipe.

[0008] As a preferred technical solution of the utility model, the permanent magnet is installed in the blind hole of the magnet fixing frame according to the NS pole sequence.

[0009] As a preferred technical solution of the utility model, a first centralizer and a second centralizer are respectively provided at both ends of the sucker rod.

[0010] As a preferred technical solution of the utility model, the outer side surface of the oil pipe and the inner side surface of the oil pipe coupling are connected by crimping.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows: the new energy oil and gas field downhole eddy current heater is reasonably designed and ingeniously conceived. It uses a permanent magnet as a magnetic field and utilizes the excess load of the oil pump as power. The eddy current heating copper tube and the permanent magnet magnetic field undergo relative movement to generate a changing magnetic field, which in turn causes the eddy current heating copper tube to generate a magnetic field force under the action of the changing magnetic field, thereby generating eddy current heat to heat the produced fluid. It is safe and reliable, has a low investment cost, does not require complicated operation and maintenance, and greatly improves the convenience of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the external eddy current heating structure in Example 1;

[0013] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure;

[0014] Figure 3 This is a schematic diagram of the built-in eddy current heating structure in Example 2;

[0015] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure.

[0016] In the figure: 1 oil pipe coupling, 2 oil pipe, 3 permanent magnet, 4 magnet fixing frame, 5 first centralizer, 6 sucker rod, 7 magnetic eddy current heating copper tube, 8 second centralizer. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] Example 1: Please refer to Figure 1-2The utility model provides a technical solution: a new energy oil and gas field downhole magnetic eddy current heater, including an oil pipe 2 and a sucker rod 6, the outer side of the oil pipe 2 is connected to the inner side of the oil pipe coupling 1 by crimping, the sucker rod 6 is located in the oil pipe 2 and reciprocates in the oil pipe 2, the permanent magnets 3 are fixed in sequence in the oil pipe 2, the magnetic eddy current heating copper tube 7 is sleeved on the outer side of the sucker rod 6, and the reciprocating motion of the sucker rod 6 in the oil pipe 2 drives the magnetic eddy current heating copper tube 7 and the permanent magnet 3 embedded on the inner wall of the oil pipe 2 to move relative to each other to generate a changing magnetic field. Due to the change of the magnetic field outside the magnetic eddy current heating copper tube 7, magnetic eddy currents are generated inside the magnetic eddy current heating copper tube 7. This installation structure is called an external magnetic eddy current heater.

[0019] Furthermore, in order to facilitate the sequential installation of the permanent magnets 3 and ensure the installation stability, the permanent magnets 3 are installed into the blind holes of the magnet fixing frame 4 in the NS pole sequence. The magnet fixing frame 4 is fixed in the oil pipe 2 with a heat-resistant and corrosion-resistant adhesive.

[0020] Furthermore, in order to prevent the sucker rod 6 and the eddy current heating copper tube 7 from scratching the magnet fixing frame 4, a first centralizer 5 and a second centralizer 8 are respectively provided at both ends of the sucker rod 6 to ensure that the sucker rod 6 reciprocates in a straight line without deflection.

[0021] Example 2: Figure 3-4 The difference from Example 1 is that the permanent magnet 3 is embedded in the sucker rod 6 through the magnet fixing frame 4, the magnetic eddy current heating copper tube 7 is fixed on the inner wall of the oil pipe 2, the permanent magnet 3 embedded in the sucker rod 6 through the magnet fixing frame 4 and the sucker rod 6 reciprocate synchronously, and the magnetic eddy current structure that generates a magnetic field change inside the magnetic eddy current heating copper tube 7 fixed on the inner wall of the oil pipe 2 is called a built-in magnetic eddy current heater.

[0022] The utility model uses the permanent magnet 3 as the magnetic field and the excess load of the oil pump as the power. The eddy current heating copper tube 7 and the magnetic field of the permanent magnet 3 move relative to each other to generate a changing magnetic field. The eddy current heating copper tube 7 generates a magnetic field force under the action of the changing magnetic field, thereby generating eddy currents and generating heat. Not only does it not require larger equipment for heating, but it is also low in cost, energy-saving and environmentally friendly, and highly safe, greatly improving the convenience of use.

[0023] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A new energy oil and gas field downhole magnetic eddy current heater, comprising an oil pipe (2) and a sucker rod (6), wherein the sucker rod (6) is located in the oil pipe (2) and reciprocates in the oil pipe (2), characterized in that: A relatively movable permanent magnet (3) and a magnetic eddy current heating copper tube (7) are arranged between the oil pipe (2) and the pumping rod (6) to generate magnetic eddy currents and generate heat.

2. The new energy oil and gas field downhole magnetic eddy current heater according to claim 1, characterized in that: The permanent magnets (3) are fixed in sequence in the oil pipe (2), and the magnetic eddy current heating copper tube (7) is sleeved on the outside of the pumping rod (6).

3. The new energy oil and gas field downhole magnetic eddy current heater according to claim 1, characterized in that: The permanent magnets (3) are fixed in sequence on the outside of the pumping rod (6), and the magnetic eddy current heating copper tube (7) is fixed inside the oil pipe (2).

4. A new energy oil and gas field downhole magnetic eddy current heater according to any one of claims 1-3, characterized in that: The permanent magnet (3) is installed in the blind hole of the magnet fixing frame (4) in the N-S pole sequence.

5. A new energy oil and gas field downhole magnetic eddy current heater according to any one of claims 1-3, characterized in that: A first centralizer (5) and a second centralizer (8) are respectively provided at both ends of the sucker rod (6).

6. The new energy oil and gas field downhole magnetic eddy current heater according to claim 1, characterized in that: The outer side surface of the oil pipe (2) and the inner side surface of the oil pipe coupling (1) are connected by crimping.

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