Electric heating device for reducing viscosity of thick oil

Abstract

The utility model relates to the technical field of petroleum processing, in particular to an electric heating device for reducing viscosity of thickened oil. The thick oil viscosity reduction electric heating device comprises multiple oil pipes and a heating cable, each oil pipe is composed of an outer pipe and an inner pipe, and multiple sets of connecting plates are fixedly installed between the outer pipes and the inner pipes. Each set of connecting plates comprises two connecting plates, inserting grooves are formed in the opposite faces of the two connecting plates, and a mounting frame is inserted between the two inserting grooves in the same set of connecting plates. According to the heavy oil viscosity reduction electric heating device, when the heating cable needs to be disassembled, the heating cable in the heating cable can be driven to move synchronously by extracting the mounting frame, so that the heating cable can be quickly extracted from the oil pipe to be disassembled, and the whole disassembling process is very convenient and quick; therefore, the difficulty of later maintenance of the heating cable by workers can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of petroleum processing technology, and in particular to an electric heating device for reducing the viscosity of heavy oil. Background Technology

[0002] Currently, SAGD (Super Aerated Diffusion) technology is commonly used for heavy oil extraction. However, this technology is not feasible in the fractured geological conditions of the Chong 5 well area because the well-developed fractures prevent the effective formation of gas cavities. Core analysis by technicians indicates that the block is rich in heavy oil resources. To effectively utilize these resources, an electrically heated viscosity-reducing development technology is being tested in this block, where SAGD development is unsuitable. This technology offers advantages such as high thermal efficiency and strong controllability.

[0003] The existing Chinese patent publication number CN107605447B discloses a heavy oil viscosity-reducing heating device. According to its description, the device mainly uses a fixing clip to fix the cable to the oil pipe during use. This fixing method requires that the oil pipe be removed together when the cable needs to be disassembled for maintenance. The cable cannot be disassembled independently, which increases the difficulty of later maintenance and repair.

[0004] Therefore, it is necessary to provide a new electric heating device for reducing the viscosity of heavy oil to solve the above-mentioned technical problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a heavy oil viscosity-reducing electric heating device.

[0006] The heavy oil viscosity reducing electric heating device provided by this utility model includes: an oil pipe and a heating cable. The oil pipe is provided with multiple pipes and is composed of an outer pipe and an inner pipe. Multiple sets of connecting plates are fixedly installed between the outer pipe and the inner pipe.

[0007] Each set of connecting plates includes two, and slots are provided on the opposite sides of the two connecting plates. An installation frame is inserted between the two slots in the same set of connecting plates. The interior of the installation frame is fixedly connected to the heating cable. The heating cable has uniformly distributed cable cores fixedly installed inside, and the outer wall of the heating cable abuts against the outer wall of the inner tube.

[0008] Preferably, the top and bottom of the cavity formed between two adjacent sets of connecting plates between the outer tube and the inner tube are both fixedly connected with arc-shaped pieces, and a fixedly connected partition plate is installed between two arc-shaped pieces in the same cavity.

[0009] Preferably, each oil pipe has two symmetrically distributed docking holes inside the upper arc-shaped plate, with the two docking holes located on both sides of the partition plate, and a through hole is provided inside the partition plate of the lowermost oil pipe.

[0010] Preferably, the top end of the outer tube is fitted with a fixed connector, and the inner wall of the connector is threadedly connected to the outer wall of another outer tube.

[0011] Preferably, a connecting ring is fixedly connected to the outer wall of the outer tube, and the connecting ring is fixedly connected to the connector in another mating outer tube by bolts.

[0012] Preferably, the mounting frame is provided with multiple mounting frames, and the top and bottom ends of the mounting frame are each provided with a fixed connecting lug, and a bolt is installed between two adjacent connecting lugs to fix them.

[0013] Compared with related technologies, the heavy oil viscosity-reducing electric heating device provided by this utility model has the following beneficial effects:

[0014] 1. When the heating cable needs to be disassembled, the heating cable inside can be moved synchronously by pulling out the mounting frame, so that the heating cable can be quickly pulled out of the oil pipe and disassembled. The whole disassembly process is very convenient and quick, which can reduce the difficulty of subsequent inspection and maintenance of the heating cable by the staff.

[0015] 2. This utility model can form multiple independent flow cavities between the outer tube and the inner tube, so that when in use, the operator can inject steam into the cavity to achieve auxiliary heating of the inner tube, thus helping to improve the heating effect of this device on heavy oil. Attached Figure Description

[0016] Figure 1 A schematic diagram of a preferred embodiment of the heavy oil viscosity-reducing electric heating device provided by this utility model;

[0017] Figure 2 for Figure 1 A schematic diagram of the oil pipe and its components is shown.

[0018] Figure 3 for Figure 1 The diagram shows the structure of the mounting frame and its components.

[0019] Figure 4 for Figure 1 The diagram shows the structure of the arc-shaped piece and its components.

[0020] The following are the labels in the diagram: 1. Oil pipe; 11. Outer pipe; 111. Connector; 12. Inner pipe; 13. Connecting plate; 131. Slot; 14. Connecting ring; 2. Mounting frame; 21. Connecting ear; 22. Heating cable; 221. Cable core; 3. Arc-shaped piece; 31. Separator plate; 32. Butt hole; 33. Through hole. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0022] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0023] Please see Figures 1 to 4 The present invention provides a heavy oil viscosity reducing electric heating device, which includes an oil pipe 1 and a heating cable 22.

[0024] In the embodiments of this utility model, please refer to Figures 1 to 4 The oil pipe 1 has multiple pipes and consists of an outer pipe 11 and an inner pipe 12. Multiple sets of connecting plates 13 are fixedly installed between the outer pipe 11 and the inner pipe 12. Each set of connecting plates 13 includes two plates, and slots 131 are opened on the opposite sides of the two connecting plates 13. A mounting frame 2 is inserted between the two slots 131 in the same set of connecting plates 13. The interior of the mounting frame 2 is fixedly connected to the heating cable 22. The heating cable 22 has evenly distributed cable cores 221 fixedly installed inside, and the outer wall of the heating cable 22 abuts against the outer wall of the inner pipe 12. Multiple mounting frames 2 are provided. Connecting ears 21 are fixedly connected at the top and bottom of the mounting frame 2, and bolts are installed between two adjacent connecting ears 21 to fix them.

[0025] It should be noted that by using the mounting frame 2 to install the heating cable 22, when it is necessary to disassemble and repair the heating cable 22 during use, the staff can pull the mounting frame 2 inserted between the outer tube 11 and the inner tube 12 upward from the top. During the extraction process, the mounting frame 2 will drive the internal heating cable 22 to move synchronously, which can quickly achieve the disassembly of the heating cable 22, thereby reducing the difficulty of the staff to inspect and maintain the heating cable 22 in the later stage.

[0026] In the embodiments of this utility model, please refer to Figures 1 to 4 The top and bottom of the cavity formed between the two adjacent sets of connecting plates 13 between the outer tube 11 and the inner tube 12 are both fixedly connected with arc-shaped pieces 3, and the two arc-shaped pieces 3 in the same cavity are fixedly connected with partition plates 31. The upper arc-shaped piece 3 in each oil pipe 1 has two symmetrically distributed docking holes 32, which are located on both sides of the partition plate 31. The partition plate 31 in the lowermost oil pipe 1 has through holes 33.

[0027] It should be noted that by designing the oil pipe 1 as a double-layer structure and installing the heating cable 22 between the two, the inner wall of the oil pipe 1 can be made more regular during subsequent use, reducing the impact of protruding parts inside the oil pipe 1 on later operations. Furthermore, by installing the partition plate 31 between the outer pipe 11 and the inner pipe 12, multiple independent flow cavities can be formed between the two. During use, the operator can also inject steam into the cavity to achieve auxiliary heating of the inner pipe 12, thus helping to improve the heating effect of this device on heavy oil.

[0028] In the embodiments of this utility model, please refer to Figures 1 to 4 The top end of the outer tube 11 is fitted with a connector 111 for fixed connection, and the inner wall of the connector 111 is threadedly connected to the outer wall of another outer tube 11. A connecting ring 14 for fixed connection is fitted on the outer wall of the outer tube 11, and the connecting ring 14 is fixedly connected to the connector 111 in another mating outer tube 11 by bolts.

[0029] It should be noted that: by setting the connector 111 and the connecting ring 14, multiple oil pipes 1 can be assembled together when inserting and installing the oil pipe 1, so that multiple oil pipes 1 can form a whole.

[0030] The working principle of the heavy oil viscosity-reducing electric heating device provided by this utility model is as follows:

[0031] When using this device, the operator can first assemble and connect multiple independent oil pipes 1 through connectors 111 and bolts, and then insert them into the oil well in sequence to complete the installation of the oil pipes 1;

[0032] Workers can then fix the heating cable 22 for electric heating in the mounting frame 2, and then insert the mounting frame 2 into the slot 131 in the connecting plate 13 of the same group. After a group of connecting plates 13 is inserted, the next group of mounting frames 2 can be assembled with the previous mounting frame 2, and so on. By repeating the above steps, multiple groups of heating cables 22 required for heating can be installed downwards in the oil pipe 1 one by one. Then, the heating cable 22 can be controlled to work through the transformer and power control cabinet (not shown in the figure) on the ground, so as to realize the electric heating of heavy oil.

[0033] When the installation of oil pipe 1 is completed, the arc-shaped pieces 3 at the top and bottom of oil pipe 1 will be smoothly connected, so that the cavities formed by the arc-shaped pieces 3 in multiple oil pipes 1 can be smoothly connected through the docking holes 32 in the arc-shaped pieces 3.

[0034] Then, the operator can connect the docking holes 32 on one side of the uppermost arc of the exhaust pipe of the external steam generator (not shown in the figure). In subsequent use, when the external steam generator is working, steam can be injected into the oil pipe 1, so that the steam flows downward inside the oil pipe 1. When the steam flows into the cavity inside the lowermost oil pipe 1, it will flow into the other side through the through hole 33 inside the lowermost partition plate 31, so that it can flow back upward. Therefore, the steam can circulate smoothly, realize the auxiliary heating of the heavy oil inside the oil pipe 1, and thus improve the heating effect of the device on the heavy oil.

[0035] When the heating cable 22 needs to be disassembled and repaired later, the staff can pull the mounting frame 2 inserted between the outer tube 11 and the inner tube 12 upward from the top. During the extraction process, the mounting frame 2 will drive the heating cable 22 inside to move synchronously, so that the heating cable 22 can be taken out from the oil pipe 1, realizing the quick disassembly of the heating cable 22, thereby reducing the difficulty of the staff to inspect and maintain the heating cable 22 later.

[0036] The circuits and controls involved in this utility model are all existing technologies, and will not be described in detail here.

[0037] The above are merely embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A thick oil viscosity reducing electric heating device, characterized by, Include: Oil pipe (1) and heating cable (22), the oil pipe (1) is provided with a plurality of and is composed of outer tube (11) and inner tube (12), a plurality of groups of connecting plates (13) are fixedly installed between the outer tube (11) and the inner tube (12); Each group of connecting plates (13) includes two, and the opposite surfaces of the two connecting plates (13) are provided with insertion slots (131), and the two insertion slots (131) in the same group of connecting plates (13) are provided with mounting frames (2), the inside of the mounting frame (2) is fixedly connected with the heating cable (22), the inside of the heating cable (22) is fixedly installed with evenly distributed cable cores (221), and the outer wall of the heating cable (22) is in contact with the outer wall of the inner tube (12).

2. The heavy oil viscosity reducing electric heating device according to claim 1, characterized in that, The top and bottom of the cavity formed between the two adjacent groups of connecting plates (13) between the outer tube (11) and the inner tube (12) are provided with fixedly connected arc-shaped sheets (3), and the two arc-shaped sheets (3) in the same cavity are provided with fixedly connected partition plates (31).

3. The heavy oil viscosity reducing electric heating device according to claim 2, characterized in that, The inside of the arc-shaped sheet (3) in each oil pipe (1) is provided with two symmetrically distributed butt joints (32), and the two butt joints (32) are respectively located on both sides of the partition plate (31), and the inside of the partition plate (31) in the lowermost oil pipe (1) is provided with a through hole (33).

4. The heavy oil viscosity reducing electric heating device according to claim 1, characterized in that, The top end of the outer tube (11) is provided with a fixedly connected connector (111), and the inner wall of the connector (111) is threadedly connected with the outer wall of another outer tube (11).

5. The heavy oil viscosity reducing electric heating device according to claim 4, characterized in that, The outer wall of the outer tube (11) is provided with a fixedly connected connecting ring (14), and the connecting ring (14) and the connector (111) in the other mutually butted outer tube (11) are fixedly connected by bolts.

6. The heavy oil viscosity reducing electric heating device of claim 1, wherein, The mounting frame (2) is provided with a plurality of mounting frames (2), and the top end and the bottom end of the mounting frame (2) are provided with fixedly connected connecting ears (21), and the bolts are installed between the adjacent two connecting ears (21) to fix them.

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