Underground continuous composite pipe cable with cable channel in center

Abstract

The underground continuous composite pipe cable with the cable channel in the center comprises an inner pipe and an outer pipe arranged outside the inner pipe in a sleeved mode, the two ends of the inner pipe are sleeved with pipe joints respectively, the two ends of the outer pipe are fixedly connected with the pipe joints in a butt joint mode respectively, and the whole pipe joints are of an annular structure. A plurality of supporting rods are evenly distributed on the wall of an inner hole of the pipe connector in the circumferential direction at intervals, the length direction of the supporting rods is parallel to the axis of the outer pipe, and the supporting rods are fixedly connected with the outer wall of the inner pipe. A tube cavity of the inner tube is a cable channel, and a signal cable, a power cable and an optical fiber are arranged in the cable channel; an annular cavity between the inner pipe and the outer pipe is a liquid channel, and the liquid channel is communicated with the outside through gaps among the supporting rods. According to the utility model, the full isolation of the cable and the liquid channel after the cable is arranged in the underground continuous pipe is realized, the safety of the cable is higher, meanwhile, the processing and manufacturing difficulty of each part structure is low, the assembly is simple, and the cost is greatly reduced compared with that of a continuous pipe device designed in an earlier stage.

Description

Technical Field

[0001] The utility model relates to an oil and gas downhole pipe and cable, in particular to an downhole continuous composite pipe and cable with a cable channel at its center. Background Art

[0002] Continuous pipes are required for transportation during the construction of oil and gas production. In order to facilitate the control of underground equipment, it is often necessary to lay cables. Cables arranged inside continuous pipes can greatly reduce damage to the cables.

[0003] Placing the cable inside the underground coiled tubing has the following problems:

[0004] 1. Downhole coiled tubing is usually connected by threaded connection. When the thread is rotated, the internal cables are twisted, causing the cables to become messy and the cable connections to be easily disconnected.

[0005] 2. When the cable is placed inside the underground continuous pipe, there is oil and gas flowing inside the continuous pipe. If the oil and gas are not isolated from the cable, it is difficult to fully ensure the safety of the cable by relying solely on the cable's own protection.

[0006] To solve the above problems, our company designed a coiled tube device with built-in cables in the early stage and applied for patents, such as patent CN210948537U. However, this patent does not completely isolate the cable from the oil and gas, but only relies on the cable's own skin isolation, and the safety performance needs to be improved. Utility Model Content

[0007] In view of the problems raised by the background technology, the purpose of the utility model is to provide an underground continuous composite pipe cable with a cable channel at the center to improve the safety of the underground continuous pipe.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] A downhole continuous composite pipe cable with a cable channel at its center, comprising an inner tube and an outer tube sleeved on the outside of the inner tube, wherein both ends of the inner tube are sleeved with pipe joints, and both ends of the outer tube are fixedly connected to the pipe joints, and the pipe joints are annular in structure as a whole, and a plurality of support rods are evenly distributed on the inner hole wall of the pipe joint at intervals along the circumferential direction, and the length direction of the support rods is parallel to the axis of the outer tube, and the plurality of support rods are fixedly connected to the outer wall of the inner tube; the lumen of the inner tube is a cable channel, and the cable channel has signal cables, power cables and optical fibers; the annular cavity between the inner tube and the outer tube is a liquid channel, and the liquid channel is connected to the outside through the gaps between the plurality of support rods.

[0010] The outer wall of the pipe joint is provided with an external thread and a sealing groove, wherein the external thread is used to connect the external pipe and cable joint, and the sealing groove is used to install a sealing ring to ensure the sealing of the external pipe and cable joint.

[0011] The inner hole wall of the pipe joint is evenly distributed with a plurality of positioning grooves along the circumferential direction, and each positioning groove is correspondingly clamped with a supporting rod.

[0012] The cable channel is provided with a filling layer, and the filling layer is used to fill the gaps between the signal cables, the power cables and the optical fibers.

[0013] The support rod is fixedly welded to the inner tube.

[0014] The utility model has the following beneficial effects: the utility model realizes full isolation of the cable from the liquid channel after the cable is built into the underground continuous pipe, and the cable is safer. At the same time, the processing and manufacturing difficulty of each part structure of the utility model is low, the assembly is simple, and the cost is greatly reduced compared with the continuous pipe device designed in the early stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a front view of the end structure of one end of the utility model.

[0016] Figure 2 for Figure 1 Cross-sectional view along the A axis.

[0017] Figure 3 It is a three-dimensional schematic diagram of one end of the utility model.

[0018] In the figure, 1. inner tube, 2. outer tube, 3. pipe joint, 4. support rod, 5. liquid channel, 6. cable channel, 7. signal cable, 8. power cable, 9. optical fiber, and 10. filling layer.

[0019] Figure 1 In order to keep the picture clear, the structure inside the cable channel is not shown. The structure inside the cable channel is referenced Figure 2 . DETAILED DESCRIPTION

[0020] The technical solution of the utility model is further described in detail below through the accompanying drawings and embodiments. It should be noted that although the illustration provided this time only shows the structure of one end of the downhole continuous composite pipe and cable, combined with the text description, it can be understood that the structures of the two ends of the downhole continuous composite pipe and cable proposed by the utility model are symmetrical, and its symmetry axis is the axial center vertical line of the downhole continuous composite pipe and cable.

[0021] like Figure 1-3As shown, the utility model provides a downhole continuous composite pipe cable with a cable channel at its center, comprising an inner pipe 1 and an outer pipe 2 sleeved outside the inner pipe 1, wherein the inner pipe 1 is sleeved with pipe joints 3 at both ends, and the outer pipe 2 is fixedly docked with the pipe joints 3 at both ends, and the pipe joints 3 are annular in structure as a whole, and the inner hole wall of the pipe joint 3 is evenly spaced with a plurality of support rods 4 at intervals along the circumferential direction, and the length direction of the support rods 4 is parallel to the axis of the outer pipe 2, and the plurality of support rods 4 are fixedly connected to the outer wall of the inner pipe 1; the lumen of the inner pipe 1 is a cable channel 6, and the cable channel 6 has a signal cable 7, a power cable 8 and an optical fiber 9; the annular cavity between the inner pipe 1 and the outer pipe 2 is a liquid channel 5, and the liquid channel 5 is connected to the outside through the gaps between the plurality of support rods 4. In the utility model, the inner pipe 1, the outer pipe 2, the pipe joints 3 and the support rods 4 are all made of metal, and their structural strength should meet the requirements of the downhole working environment of oil and gas wells.

[0022] The outer wall of the pipe joint 3 is provided with an external thread and a sealing groove, wherein the external thread is used to connect the external pipe and cable joint, and the sealing groove is used to install a sealing ring to ensure the sealing of the external pipe and cable joint.

[0023] The inner hole wall of the pipe joint 3 is uniformly provided with a plurality of positioning grooves along the circumferential direction, and each positioning groove corresponds to a support rod 4. In one embodiment of the utility model, the support rod 4 is prefabricated in advance, inserted into the corresponding positioning groove of the pipe joint 3, and then welded to the pipe joint 3.

[0024] The cable channel 6 has a filling layer 10 therein, and the filling layer 10 is used to fill the gaps between the signal cable 7, the power cable 8 and the optical fiber 9. The filling layer 10 is an insulating and heat-preserving fire-resistant material.

[0025] The support rod 4 is fixedly welded to the inner tube 1 .

[0026] An assembly process of the utility model is as follows: the inner tube 1 and the outer tube 2 are processed separately, and then the inner tube 1 is inserted into the outer tube 2, and then the pipe joint 3 is put on the inner tube 1, and then the support rod 4 is inserted into the positioning groove of the pipe joint 3, and finally the pipe joint 3 and the outer tube 2 are welded and fixed, and then the support rod 4 is welded.

[0027] The parts not described in detail in this utility model are prior art.

Claims

1. A downhole continuous composite cable tube with a cable channel at its center, comprising an inner tube (1) and an outer tube (2) sleeved outside the inner tube (1), wherein: The inner tube (1) is provided with pipe joints (3) at both ends, and the outer tube (2) is fixedly connected to the pipe joints (3) at both ends. The pipe joint (3) is an annular structure as a whole. The inner hole wall of the pipe joint (3) is evenly spaced with a plurality of support rods (4) along the circumferential direction. The length direction of the support rods (4) is parallel to the axis of the outer tube (2). The plurality of support rods (4) are fixedly connected to the outer wall of the inner tube (1). The lumen of the inner tube (1) is a cable channel (6), and the cable channel (6) contains a signal cable (7), a power cable (8) and an optical fiber (9). The annular cavity between the inner tube (1) and the outer tube (2) is a liquid channel (5), and the liquid channel (5) is connected to the outside through the gaps between the plurality of support rods (4).

2. The underground continuous composite pipe cable with a cable channel at its center according to claim 1, characterized in that: The outer wall of the pipe joint (3) is provided with an external thread and a sealing groove, wherein the external thread is used to connect an external pipe and cable joint, and the sealing groove is used to install a sealing ring to ensure the sealing of the external pipe and cable joint.

3. The underground continuous composite cable with a cable channel at its center according to claim 1, characterized in that: The inner hole wall of the pipe joint (3) is evenly distributed with a plurality of positioning grooves along the circumferential direction, and each positioning groove corresponds to a support rod (4) for clamping.

4. The underground continuous composite cable with a cable channel at its center according to claim 1, characterized in that: The cable channel (6) has a filling layer (10) therein, and the filling layer (10) is used to fill the gaps between the signal cable (7), the power cable (8) and the optical fiber (9).

5. The underground continuous composite cable with a cable channel at its center according to claim 1, characterized in that: The support rod (4) is fixedly welded to the inner tube (1).

Images