Novel oil-submerged pump cable

Abstract

The utility model relates to a novel oil-submerged pump cable, and belongs to the technical field of cables. According to the technical scheme, the cable comprises three cable cores arranged side by side and a stainless steel pipe II (7) for liquid injection, and the three cable cores and the stainless steel pipe II (7) are wrapped by an armor layer (8); the wire core comprises a copper conductor (1), an insulating layer I (2), an insulating layer II (3), a sheath layer (4), a braid layer (5) and a stainless steel pipe I (6), the insulating layer I (2) and the insulating layer II (3) are sequentially coated outside the copper conductor (1), the sheath layer (4) is extruded outside the insulating layer II (3), the braid layer (5) is arranged outside the sheath layer (4), and the stainless steel pipe I (6) is arranged outside the braid layer (5). The oil-submerged pump cable has the advantages of being high in insulation resistance, low in leakage performance, high in oil resistance, high in sealing performance and high in mechanical strength, and can convey chemical reagents at the same time.

Description

Technical Field

[0001] The utility model relates to a novel submersible pump cable, belonging to the technical field of cables. Background Art

[0002] In oil extraction operations, cables are laid in oil wells for a long time, with the operating temperature reaching 232°C.

[0003] At present, submersible pump cables generally use EPDM or thermoplastics as the insulation layer, and the sheath uses nitrile rubber, lead and other materials to meet the needs of actual production. The insulation performance, heat resistance, oil resistance and wear resistance of cables with this structure need to be improved.

[0004] In addition, due to the small amount of oil layer at the bottom of the well and insufficient pressure, it is impossible to achieve self-booting oil production. Instead, the method of using a bottom-hole electric pump to provide power to drive the oil production equipment is adopted. Due to the deep bottom of the well, in order to maintain the good fluidity of the crude oil and prevent the pipeline from being blocked, it is necessary to add chemical reagents to the oil to dilute the oil. Generally, additional stainless steel capillary pipes are required for the addition of chemical reagents.

[0005] Therefore, in order to enable the submersible pump cable to withstand the influence of high temperature, high pressure and mechanical load in harsh oil wells for a long time, and to further increase the effective utilization of the submersible pump cable space, it is necessary to propose a new submersible pump cable to solve the problems existing in the above-mentioned background technology. Utility Model Content

[0006] The purpose of the utility model is to provide a new submersible pump cable with high insulation, high temperature resistance, high oil resistance, high sealing, high mechanical strength and good overall performance. At the same time, the space of the submersible pump cable is effectively utilized so that it can simultaneously transport chemical reagents, thereby solving the above-mentioned problems existing in the background technology.

[0007] The technical solution of the utility model is:

[0008] A novel submersible pump cable comprises three wire cores arranged side by side and a stainless steel tube 2 for injection, the three wire cores and the stainless steel tube 2 are wrapped with an armor layer on the outside; the wire core comprises a copper conductor, an insulating layer 1, an insulating layer 2, a sheath layer, a braided layer and a stainless steel tube 1, the copper conductor is provided with an insulating layer 1 and an insulating layer 2 sequentially coated on the outside, the insulating layer 2 is extruded with a sheath layer, the sheath layer is provided with a braided layer, and the braided layer is provided with a stainless steel tube 1 on the outside.

[0009] Furthermore, the first insulating layer is a polyimide-F46 insulating layer, and the second insulating layer is an ethylene propylene rubber insulating layer.

[0010] Furthermore, the sheath layer is a polyetheretherketone sheath layer.

[0011] Furthermore, the braided layer is a polyester yarn braided layer.

[0012] Furthermore, the copper conductor is a solid structure.

[0013] Furthermore, the diameter of the wire core is the same as the outer diameter of the stainless steel tube 2, and the center points of the three wire cores and the center point of the stainless steel tube 2 are located on the same straight line, arranged in a straight line, and the entire submersible pump cable is in a long and flat round shape.

[0014] The positive effects of the utility model are as follows: the submersible pump cable has the advantages of high insulation resistance, low leakage, high oil resistance, high sealing, and high mechanical strength, and can also transport chemical reagents. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] In the figure: copper conductor 1, insulation layer 1 2, insulation layer 2 3, sheath layer 4, braided layer 5, stainless steel tube 1 6, stainless steel tube 2 7, armor layer 8. DETAILED DESCRIPTION

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0018] Combined with Figure 1 The present embodiment provides a novel submersible pump cable, comprising three wire cores arranged side by side and a stainless steel tube 27 for injection, the three wire cores and the stainless steel tube 27 are wrapped with an armor layer 8 on the outside; the wire core comprises a copper conductor 1, an insulating layer 1 2, an insulating layer 2 3, a sheath layer 4, a braided layer 5 and a stainless steel tube 1 6, the copper conductor 1 is provided with an insulating layer 1 2 and an insulating layer 2 3 sequentially coated on the outside to form a double-layer insulation layer, the insulating layer 2 3 is extruded with a sheath layer 4, the sheath layer 4 is provided with a braided layer 5, and the braided layer 5 is provided with a stainless steel tube 1 6 on the outside.

[0019] As an optimization, the insulating layer 2 is made of a polyimide-F46 sintered film, and its thickness is ≥ 0.2 mm.

[0020] As an optimization, the insulating layer 2 3 is made of EPDM rubber and has a thickness of ≥1.9 mm.

[0021] As an optimization, the sheath layer 4 is made of polyetheretherketone (PEEK) and has a thickness of ≥1.0 mm.

[0022] As an optimization, the braided layer 5 is made of polyester yarn, and its thickness is ≥0.2 mm.

[0023] As an optimization, the thickness of the stainless steel tube 1 6 and the stainless steel tube 2 7 is ≥ 1.245 mm.

[0024] As an optimization, the armor layer 8 is made of stainless steel strips, galvanized steel strips or monel steel strips in Z-type interlocking armor.

[0025] As an optimization, the copper conductor 1 adopts a solid structure.

[0026] The utility model adopts a double-layer insulation layer (insulation layer 1 2 and insulation layer 2 3), the material of insulation layer 1 2 is polyimide-F46, and the material of insulation layer 2 3 is ethylene propylene rubber. The double-layer insulation ensures that the cable has the advantages of high insulation resistance and low leakage current. The sheath layer 4 adopts polyetheretherketone (PEEK) sheath to replace the traditional lead sheath or nitrile sheath, and the material of the braided layer 5 is polyester yarn. A layer of stainless steel tube 1 6 is welded outside the braided layer 5 to ensure the oil resistance, sealing and mechanical properties of the cable. Polyester yarn is used as the braided layer 5 between the polyetheretherketone (PEEK) sheath layer 4 and the stainless steel tube 1 6 to protect the sheath layer 4, and to make the pull-out force of the welded pipe easier to adjust, greatly reducing the difficulty of production. The above material combination enables the cable to achieve the best performance at a long-term working temperature of 232°C, which is suitable for complex mines. Compared with traditional submersible pump cables, it has the advantages of high insulation resistance, low leakage, high oil resistance, high sealing and high mechanical strength. Among them, compared with traditional submersible pump cables, the insulation resistance is more than 5 times that of traditional submersible pump cables, and the current leakage value is 1 / 5 of that of traditional submersible pump cables.

[0027] The three wire cores and the stainless steel pipe 7 used for injection are arranged in a straight line and are wrapped by an armor layer 8 so that they are integrated together, which is conducive to saving space and facilitating construction operations.

Claims

1. A new type of submersible pump cable, characterized by: The invention comprises three wire cores arranged side by side and a second stainless steel tube (7) for liquid injection, wherein the three wire cores and the second stainless steel tube (7) are externally wrapped with an armor layer (8); the wire core comprises a copper conductor (1), an insulating layer (2), an insulating layer (3), a sheath layer (4), a braided layer (5) and a first stainless steel tube (6); the copper conductor (1) is externally provided with an insulating layer (2) and a second insulating layer (3) sequentially wrapped thereon, the second insulating layer (3) is externally extruded with a sheath layer (4), the sheath layer (4) is externally provided with a braided layer (5), and the braided layer (5) is externally provided with a first stainless steel tube (6).

2. A new submersible pump cable according to claim 1, characterized in that: The insulating layer 1 (2) is a polyimide-F46 insulating layer, and the insulating layer 2 (3) is an ethylene propylene rubber insulating layer.

3. A new submersible pump cable according to claim 1 or 2, characterized in that: The sheath layer (4) is a polyetheretherketone sheath layer.

4. A new submersible pump cable according to claim 1 or 2, characterized in that: The braided layer (5) is a polyester yarn braided layer.

5. A new submersible pump cable according to claim 1 or 2, characterized in that: The copper conductor (1) is a solid structure.

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