High-temperature-resistant and high-pressure-resistant submersible cable

Abstract

The utility model relates to a high temperature and high pressure resistant submersible cable. According to the technical scheme, a sintered polyimide film inner insulating layer is wrapped outside a copper conductor, a modified high-temperature-resistant fluoroplastic outer insulating layer is extruded outside the polyimide film inner insulating layer, an inorganic heat-insulating cushion layer is wrapped outside the modified high-temperature-resistant fluoroplastic outer insulating layer, a nickel-based alloy steel pipe packaging sheath layer is wrapped outside the inorganic heat-insulating layer, and the nickel-based alloy steel pipe packaging sheath layer is wrapped outside the nickel-based alloy steel pipe packaging sheath layer. And the nickel-based alloy steel strip armoring layer is armoured outside the nickel-based alloy steel pipe packaging sheath layer. The beneficial effects of the utility model are that the cable employs modified ECA fluoroplastic resin and can continuously work at a static high temperature of 350 DEG C, the monel nickel-based alloy steel belt is employed to perform Z-shaped corrugated profiling and wrapping and armoring in an interlocking manner, the formed nickel-based alloy steel belt armoring layer can resist high pressure of more than 40 Mpa, and the cable can be used as a high-voltage cable. The electric energy supply of the submersible unit in the high-temperature, high-pressure and high-corrosion underground environment is fully guaranteed, and the oil extraction efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power cables for high-temperature electric submersible pump oil production systems, in particular to a high-temperature and high-pressure resistant submersible oil cable. Background Art

[0002] In oilfield production, especially in high water-content oil wells, a considerable portion of the crude oil in the oil wells is produced by electric submersible pumps, which play an important role in the lifting technology of non-flowing high-yield wells and high water-content wells. The electric submersible pump is a multi-stage centrifugal pump working underground. The centrifugal pump and the submersible motor are lowered into the well with an oil pipe. The motor drives the multi-stage centrifugal pump to rotate and generate centrifugal force to lift the crude oil in the well to the surface. Among them, the submersible power cable, as the channel part for transmitting electrical energy in the submersible pump, works in an environment of high temperature, high pressure and corrosive fluid for a long time. Therefore, the submersible power cable is required to have high core wire electrical properties, dielectric properties of the insulation layer, good overall corrosion resistance, wear resistance, high temperature resistance and other stable physical and chemical properties. However, the working environment of existing high-temperature and high-pressure oil wells is generally harsh, with high temperature and pressure, and accompanied by high sulfur content and high acidity. In the production of such downhole conditions, there are many difficulties and problems, such as prominent contradictions between safety and economy, complex operating conditions and downhole conditions, and high performance requirements for completion equipment and tooling. Utility Model Content

[0003] The purpose of the utility model is to provide a high-temperature and high-pressure submersible cable to address the above-mentioned defects in the prior art. By adding a modified ECA fluoroplastic outer insulation layer and an armored nickel-based alloy steel belt armor layer, it can meet the harsh underground environment of high temperature resistance of 350°C, high pressure of more than 70Mpa and corrosion resistance.

[0004] The utility model discloses a high-temperature and high-voltage submersible cable, the technical solution of which is to include a round copper conductor (1), a polyimide film inner insulation layer (2), a modified ECA fluoroplastic outer insulation layer (3), an inorganic thermal insulation cushion layer, a nickel-based alloy steel tube encapsulated sheath layer (6) and a nickel-based alloy steel belt armor layer (7), wherein the round copper conductor (1) is externally wrapped with a sintered polyimide film inner insulation layer (2), the polyimide film inner insulation layer (2) is externally extruded with a modified ECA fluoroplastic outer insulation layer (3), the modified ECA fluoroplastic outer insulation layer (3) is externally wrapped with an inorganic thermal insulation cushion layer, a nickel-based alloy steel tube encapsulated sheath layer (6) is installed externally of the inorganic thermal insulation layer, and the nickel-based alloy steel tube encapsulated sheath layer (6) is externally armored with a nickel-based alloy steel belt armor layer (7).

[0005] Preferably, the inorganic thermal insulation cushion layer comprises a phlogopite fiber tape (4) and an aramid fiber tape (5), wherein the phlogopite fiber tape (4) is arranged on the outer layer of the modified ECA fluoroplastic outer insulation layer (3), and the aramid fiber tape (5) is installed on the outer layer of the phlogopite fiber tape (4).

[0006] Preferably, the thickness of the polyimide film inner insulating layer (2) is 0.5-0.8 mm, and the thickness of the modified ECA fluoroplastic outer insulating layer (3) is 0.3-0.9 mm.

[0007] Preferably, the thickness of the phlogopite fiber band (4) and the aramid fiber band (5) is 0.35 to 0.8 mm.

[0008] Preferably, the material of the nickel-based alloy steel tube used in the above-mentioned nickel-based alloy steel tube packaging sheath layer (6) is incoloy825.

[0009] Preferably, the material of the nickel-based alloy steel strip in the above-mentioned nickel-based alloy steel strip armor layer (7) is monel.

[0010] Preferably, one or more nickel-based alloy steel strips are interlocked in a "Z" shape and armored on the outside of the nickel-based alloy steel tube encapsulation sheath layer (6) to form a nickel-based alloy steel strip armor layer (7).

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0012] The utility model forms a nickel-based alloy steel belt armor layer on the outside of the nickel-based alloy steel pipe encapsulation sheath layer through "Z"-shaped interlocking armoring, which can improve the pressure resistance. In addition, a modified ECA fluoroplastic outer insulation layer is also provided to improve the high temperature resistance. Therefore, it can be used for production operations under high temperature, high pressure and severe corrosion conditions in submersible electric pump oil production systems, fully ensuring the power supply of submersible units in high temperature, high pressure and high corrosion underground environments, ensuring production safety and service life, and improving oil production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a high temperature and high pressure submersible oil cable prepared by the utility model;

[0014] Figure 2 yes Figure 1 Schematic cross-sectional view of ;

[0015] Figure 3 It is a schematic diagram of the structure of the nickel-based alloy steel belt of the utility model using "Z"-shaped interlocking armor;

[0016] In the above figure: round copper conductor 1, polyimide film inner insulation layer 2, modified ECA fluoroplastic outer insulation layer 3, phlogopite fiber tape 4, aramid fiber tape 5, nickel-based alloy steel pipe encapsulation sheath layer 6, nickel-based alloy steel tape armor layer 7. DETAILED DESCRIPTION

[0017] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0018] Embodiment 1, the utility model mentions a high temperature and high pressure submersible cable, comprising a round copper conductor 1, a polyimide film inner insulation layer 2, a modified ECA fluoroplastic outer insulation layer 3, an inorganic thermal insulation cushion layer, a nickel-based alloy steel tube encapsulated sheath layer 6 and a nickel-based alloy steel belt armor layer 7, the round copper conductor 1 is externally wrapped with a sintered polyimide film inner insulation layer 2, the polyimide film inner insulation layer 2 is externally extruded with a modified ECA fluoroplastic outer insulation layer 3, the modified ECA fluoroplastic outer insulation layer 3 is externally wrapped with an inorganic thermal insulation cushion layer, a nickel-based alloy steel tube encapsulated sheath layer 6 is installed externally of the inorganic thermal insulation layer, and the nickel-based alloy steel tube encapsulated sheath layer 6 is externally armored with a nickel-based alloy steel belt armor layer 7.

[0019] The inorganic thermal insulation cushion layer comprises phlogopite fiber tape 4 and aramid fiber tape 5 . The phlogopite fiber tape 4 is arranged on the outer layer of the modified ECA fluoroplastic outer insulation layer 3 , and the aramid fiber tape 5 is arranged on the outer layer of the phlogopite fiber tape 4 .

[0020] The thickness of the polyimide film inner insulating layer 2 is 0.5-0.8 mm, and the thickness of the modified ECA fluoroplastic outer insulating layer 3 is 0.3-0.9 mm.

[0021] The thickness of the phlogopite fiber tape 4 and the aramid fiber tape 5 is 0.35-0.8 mm.

[0022] One or more nickel-based alloy steel strips are interlocked in a "Z" shape and armored on the outside of the nickel-based alloy steel pipe encapsulation sheath layer 6 to form a nickel-based alloy steel strip armor layer 7.

[0023] In addition, the preparation method of the utility model comprises the following steps:

[0024] Step 1, drawing or extruding an oxygen-free copper rod into a round copper conductor 1 with a diameter of 4.6 mm, wherein the outer surface of the round copper conductor 1 is plated with silver to prevent oxidation of the round copper conductor;

[0025] Step 2: On the outside of the round copper conductor 1, four layers of polyimide film are wrapped by two-thirds lap wrapping and sintering to form a polyimide film inner insulation layer 2 with an overall insulation thickness of 0.7 mm-0.9 mm;

[0026] Step 3, the modified ECA fluoroplastic material is tightly coated on the outside of the polyimide film inner insulating layer 2 by extrusion tube extrusion and true hole drawing to form a modified ECA fluoroplastic outer insulating layer 3, and the thickness of the polyimide film inner insulating layer 2 is 0.8 mm;

[0027] Step 4, a wrapping tape made of two layers of inorganic materials, the first layer is a phlogopite fiber tape 4, and the second layer is an aramid fiber tape 5, which is tightly wrapped on the outside of the modified ECA fluoroplastic outer insulation layer 3 to form a heat insulation cushion layer, and the thickness of the heat insulation cushion layer is 0.4 mm;

[0028] Step 5: The nickel-based alloy steel strip adopts incoloy825, passes through a shaping die, and is longitudinally wrapped after shaping, and is formed into a nickel-based alloy steel pipe by a laser welding method, and then is drawn through a die to a diameter of 9.6 mm, and is tightly wrapped on the outside of the thermal insulation cushion layer to form a nickel-based alloy steel pipe packaging sheath layer 6 with a withstand pressure of more than 40 MPa;

[0029] Step 6: The monel nickel-based alloy steel strip is formed into a Z-shaped corrugated sheet and folded, and is interlockedly armored on the outside of the nickel-based alloy steel tube packaging sheath layer 6 to form a nickel-based alloy steel strip armor layer 7 with a size of 12.5×31 mm.

[0030] The utility model can meet the use conditions under the harsh underground working conditions of static high temperature 350°C and pressure 40Mpa, fully guarantees the power supply of the submersible unit in the underground environment of high temperature, high pressure and high corrosion, ensures production safety and service life, and improves oil production efficiency.

[0031] Embodiment 2, the utility model mentions a high temperature and high pressure submersible cable, comprising a round copper conductor 1, a polyimide film inner insulation layer 2, a modified ECA fluoroplastic outer insulation layer 3, an inorganic thermal insulation cushion layer, a nickel-based alloy steel tube encapsulated sheath layer 6 and a nickel-based alloy steel belt armor layer 7, the round copper conductor 1 is externally wrapped with a sintered polyimide film inner insulation layer 2, the polyimide film inner insulation layer 2 is externally extruded with a modified ECA fluoroplastic outer insulation layer 3, the modified ECA fluoroplastic outer insulation layer 3 is externally wrapped with an inorganic thermal insulation cushion layer, a nickel-based alloy steel tube encapsulated sheath layer 6 is installed externally of the inorganic thermal insulation layer, and the nickel-based alloy steel tube encapsulated sheath layer 6 is externally armored with a nickel-based alloy steel belt armor layer 7.

[0032] The difference from Example 1 is:

[0033] The material of the nickel-based alloy steel pipe used in the nickel-based alloy steel pipe encapsulation sheath layer 6 mentioned in this embodiment is incoloy825, and the material of the nickel-based alloy steel strip in the above-mentioned nickel-based alloy steel strip armor layer 7 is monel.

[0034] The above are only some preferred embodiments of the utility model. Any person skilled in the art may modify the above technical solutions or modify them into equivalent technical solutions. Therefore, the corresponding simple modifications or equivalent transformations made according to the technical solutions of the utility model shall fall within the scope of protection claimed by the utility model.

Claims

1. A high temperature and high pressure submersible cable, characterized by: The invention comprises a round copper conductor (1), a polyimide film inner insulation layer (2), a modified ECA fluoroplastic outer insulation layer (3), an inorganic thermal insulation cushion layer, a nickel-based alloy steel tube encapsulation sheath layer (6) and a nickel-based alloy steel belt armor layer (7), wherein the round copper conductor (1) is externally wrapped with a sintered polyimide film inner insulation layer (2), the polyimide film inner insulation layer (2) is externally extruded with a modified ECA fluoroplastic outer insulation layer (3), the modified ECA fluoroplastic outer insulation layer (3) is externally wrapped with an inorganic thermal insulation cushion layer, a nickel-based alloy steel tube encapsulation sheath layer (6) is installed externally of the inorganic thermal insulation layer, and the nickel-based alloy steel tube encapsulation sheath layer (6) is externally armored with a nickel-based alloy steel belt armor layer (7).

2. The high temperature and high pressure resistant submersible cable according to claim 1 is characterized in that: The inorganic thermal insulation cushion layer comprises a phlogopite fiber tape (4) and an aramid fiber tape (5), wherein the phlogopite fiber tape (4) is arranged on the outer layer of the modified ECA fluoroplastic outer insulation layer (3), and the aramid fiber tape (5) is arranged on the outer layer of the phlogopite fiber tape (4).

3. The high temperature and high pressure submersible cable according to claim 2 is characterized in that: The thickness of the polyimide film inner insulating layer (2) is 0.5-0.8 mm, and the thickness of the modified ECA fluoroplastic outer insulating layer (3) is 0.3-0.9 mm.

4. The high temperature and high pressure submersible cable according to claim 3 is characterized in that: The thickness of the phlogopite fiber band (4) and the aramid fiber band (5) is 0.35-0.8 mm.

5. The high temperature and high pressure submersible cable according to claim 4 is characterized in that: The nickel-based alloy steel tube used in the nickel-based alloy steel tube packaging sheath layer (6) is made of incoloy825.

6. The high temperature and high pressure resistant submersible cable according to claim 5 is characterized in that: The material of the nickel-based alloy steel strip in the nickel-based alloy steel strip armor layer (7) is monel.

7. The high temperature and high pressure resistant submersible cable according to claim 6 is characterized in that: One or more nickel-based alloy steel strips are interlocked in a "Z" shape and are armored on the outside of the nickel-based alloy steel pipe encapsulation sheath layer (6) to form a nickel-based alloy steel strip armor layer (7).

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