Ground load-bearing detection cable with depth of more than ten thousand meters and production method of ground load-bearing detection cable

Abstract

The invention relates to the field of underground detection, in particular to a ground load-bearing detection cable exceeding ten thousand meters in depth and a production method of the ground load-bearing detection cable. The first core wire and the second core wire comprise copper conductor wire cores and insulating layers, the insulating layers are arranged on the outer sides of the copper conductor wire cores, the second core wire is arranged around the first core wire, a shielding layer is arranged around the second core wire, and semi-conductive filling layers are arranged between the second core wire and the first core wire and between the second core wire and the shielding layer. A filler is arranged between the second core wire and the shielding layer, and a steel wire armor is arranged around the outer side of the shielding layer. The shielding layer is arranged on the outer side of the second core wire, interference of the outside to signals transmitted by the cable is avoided, long-distance signal transmission is achieved, and the shielding layer can bear super-strong tensile strength by arranging the steel wire armor on the outer side of the shielding layer.

Description

Technical Field

[0001] The present invention relates to the field of underground detection. Background Art

[0002] Currently, my country relies on imports for 70% of its oil. Energy development is a strategic need for my country. Oil and gas in ultra-deep formations of 10-12km will be the main recoverable oil and gas resources in my country in the next 20 years. Well logging exceeding 10,000 meters is currently a world-class challenge, requiring solutions to problems such as downhole cables withstanding ultra-high temperatures, ultra-strong breaking force, and long-distance signal transmission. Summary of the Invention

[0003] In order to solve the technical problems of cables bearing ultra-strong breaking force and long-distance signal transmission in ultra-deep strata, the present invention provides a load-bearing detection cable exceeding 10,000 meters deep and a production method thereof.

[0004] The technical solution adopted by the present invention to achieve the above-mentioned purpose is:

[0005] A load-bearing detection cable for a depth of over 10,000 meters, wherein the first core wire 7 and the second core wire 8 include a copper conductor core 11 and an insulating layer 2, the insulating layer 2 being arranged on the outside of the copper conductor core 11, the second core wire 8 being arranged around the first core wire 7, a shielding layer 5 being arranged around the second core wire 8, a semi-conductive filling layer 4 being arranged between the second core wire 8 and the first core wire 7 and between the second core wire 8 and the shielding layer 5, a filler 3 being further arranged between the second core wire 8 and the shielding layer 5, and a steel wire armor being arranged around the outside of the shielding layer 5.

[0006] The copper conductor core 11 includes a first copper conductor 1 and a second copper conductor 9 . The second copper conductor 9 is arranged around the first copper conductor 1 . The number of the second copper conductors 9 and the number of the second core wires 8 are both six.

[0007] The steel wire armor includes a first layer of steel wires 6 and a second layer of steel wires 10. The first layer of steel wires 6 is arranged around the shielding layer 5, and the second layer of steel wires 10 is located on the outside of the first layer of steel wires 6. The surfaces and gaps of the first layer of steel wires 6 and the second layer of steel wires 10 are coated with sealing material. The components of the sealing material include diesel, asphalt, glycerin, wire rope oil, rail oil, anti-rust oil, green bauxite, talcum powder and graphite.

[0008] The number of the first layer steel wires 6 and the number of the second layer steel wires 10 are both twenty-two. The breaking force of the first layer steel wires 6 is greater than 2595 N / piece, and the breaking force of the second layer steel wires 10 is greater than 4415 N / piece.

[0009] The surfaces of the first layer of steel wires 6 and the second layer of steel wires 10 are plated with a zinc-aluminum alloy anti-corrosion layer.

[0010] The insulating layer 2 is tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer.

[0011] A production method for producing the above-mentioned load-bearing detection cable with a depth exceeding 10,000 meters comprises the following steps:

[0012] S1. When the resistance of the first copper conductor 1 and the second copper conductor 9 is known, calculate the cross-sectional area of the first copper conductor 1 and the second copper conductor 9 and select the corresponding first copper conductor 1 and the second copper conductor 9;

[0013] S2. The first copper conductor 1 and the second copper conductor 9 are twisted in a regular manner to obtain a copper conductor core 11;

[0014] S3. Wrap an insulating layer around the outer side of the copper conductor core 11 to obtain a first core 7 and a second core 8. Twist the first core 7 and the second core 8 in a regular 1+6 pattern, and provide a shielding layer 5 on the outer side of the second core 8. Provide a semiconductive filling layer 4 between the second core 8 and the first core 7 and between the second core 8 and the shielding layer 5. Provide a filler 3 between the second core 8 and the shielding layer 5.

[0015] S4. Calculate the wire diameters of the first and second layers of steel wire 10 based on the breaking force of the first layer of steel wire 6 and the breaking force of the second layer of steel wire 10;

[0016] S5. Calculate the number of steel wires in the first layer 6 and the second layer 10 based on the obtained wire diameter;

[0017] S6. Use an armoring machine to twist the first layer of steel wires 6 on the outside of the shielding layer 5, twist the second layer of steel wires 10 on the outside of the first layer of steel wires 6, and coat the surfaces of the first layer of steel wires 6 and the second layer of steel wires 10 with a galvanized aluminum alloy anti-corrosion layer.

[0018] The calculation formula for calculating the cross-sectional area of the first copper conductor 1 and the second copper conductor 9 in step S1 is as follows:

[0019]

[0020]

[0021]

[0022] Where: α is the cable attenuation coefficient; R is the cable DC resistance; C is the cable capacitance; ω is the angular frequency; ρ is the resistivity; S is the cross-sectional area of the copper conductor; L is the conductor length; ε is the dielectric constant of the insulating material; D' is the diameter of the first core 7 and the second core 8; d ’ is the diameter of the copper conductor core 11.

[0023] The calculation formula for calculating the steel wire diameters of the first layer steel wire 6 and the second layer steel wire 10 in step S4 is as follows:

[0024]

[0025] Where: F is the breaking force of the steel wire; P is the tensile strength of the steel wire; S1 is the cross-sectional area of the steel wire; D1 is the diameter of the steel wire.

[0026] The calculation formula for calculating the number of steel wires in the first layer 6 and the second layer 10 in step S5 is as follows:

[0027]

[0028] Where: Z is the number of steel wires; D is the diameter of the steel wire after armoring; D1 is the diameter of the steel wire; l1 is the pitch of the steel wire armor, and l2 is the stranded length of the steel wire.

[0029] The advantages of the present invention compared with the prior art are:

[0030] By setting a shielding layer on the outside of the second core wire, external interference with the signal transmitted by the cable is avoided, and long-distance signal transmission is achieved. By setting steel wire armor on the outside of the shielding layer, the shielding layer can withstand super strong breaking force. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a cross-sectional view of a load-bearing detection cable exceeding 10,000 meters in depth according to the present invention.

[0032] In the figure: 1. First copper conductor; 2. Insulation layer; 3. Filler; 4. Semi-conductive filling layer; 5. Shielding layer; 6. First layer of steel wire; 7. First core wire; 8. Second core wire; 9. Second copper conductor; 10. Second layer of steel wire; 11. Copper conductor core. DETAILED DESCRIPTION

[0033] The present invention provides a load-bearing detection cable for a depth of more than 10,000 meters. Figure 1 As shown, the first core wire 7 and the second core wire 8 include a copper conductor core 11 and an insulating layer 2, the insulating layer 2 is arranged on the outside of the copper conductor core 11, the second core wire 8 is arranged around the first core wire 7, the copper conductor core 11 includes a first copper conductor 1 and a second copper conductor 9, the second copper conductor 9 is arranged around the first copper conductor 1, the number of the second copper conductor 9 and the second core wire 8 are both six, the copper conductor core 11 and the core wires are all twisted in a regular 1+6 manner, so that long-distance signal transmission of the cable can be achieved; a shielding layer 5 is provided around the second core wire 8, and the shielding layer 5 can avoid external interference with the cable signal transmission, a semi-conductive filling layer 4 is provided between the second core wire 8 and the first core wire 7 and between the second core wire 8 and the shielding layer 5, a filler 3 is also provided between the second core wire 8 and the shielding layer 5, and a steel wire armor is provided around the outside of the shielding layer 5.

[0034] The steel wire armor includes a first layer of steel wires 6 and a second layer of steel wires 10. The first layer of steel wires 6 is arranged around the shielding layer 5, and the second layer of steel wires 10 is located on the outside of the first layer of steel wires 6. The surfaces and gaps of the first layer of steel wires 6 and the second layer of steel wires 10 are coated with sealing material. The components of the sealing material include diesel, asphalt, glycerin, wire rope oil, track oil, anti-rust oil, green bauxite, talcum powder and graphite. The sealing material can improve the pressure resistance of the steel wire armor and meet the requirements of super-strong breaking force of the cable. The number of the first layer of steel wires 6 and the second layer of steel wires 10 are both twenty-two. The breaking force of the first layer of steel wires 6 is greater than 2595N / root, and the breaking force of the second layer of steel wires 10 is greater than 4415N / root, to meet the high strength requirements of the cable. The breaking force of the cable in this application is 30% higher than that of W7BPP-HS-12.4110KN, reaching more than 144KN; the methods for increasing the breaking force of the cable are: 1. increasing the tensile strength of the steel wire, and 2. increasing the cross-sectional area of the steel wire on the basis of the same tensile strength; due to the limitation of the cable diameter, increasing the steel wire area to increase the breaking force of the cable is limited, and cannot meet the breaking force requirements of cables exceeding 10,000 meters. Therefore, only by increasing the tensile strength of the steel wire can the breaking force requirements of cables exceeding 10,000 meters be met; in order to increase the tensile strength of the steel wire, high carbon alloy steel is selected, the content of trace elements Si and Mn is increased, the strength and toughness of the steel wire are improved, and the strength of the steel wire reaches 2550Mpa. The surfaces of the first layer of steel wire 6 and the second layer of steel wire 10 are coated with a zinc-aluminum alloy anti-corrosion layer to improve the corrosion resistance of the steel wire armor. The insulation layer is made of tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer with a melting point of 302-310°C.

[0035] A production method for producing the above-mentioned load-bearing detection cable with a depth exceeding 10,000 meters comprises the following steps:

[0036] S1. When the resistance of the first copper conductor 1 and the second copper conductor 9 is known, calculate the cross-sectional area of the first copper conductor 1 and the second copper conductor 9 and select the corresponding first copper conductor 1 and the second copper conductor 9;

[0037] The calculation formula for calculating the cross-sectional area of the first copper conductor 1 and the second copper conductor 9 is as follows:

[0038] When the frequency of cable signal transmission is ≤1000Hz,

[0039]

[0040]

[0041]

[0042] Where: α is the cable attenuation coefficient; R is the cable DC resistance; C is the cable capacitance; ω is the angular frequency (constant); ρ is the resistivity; S is the cross-sectional area of the copper conductor; L is the conductor length; ε is the dielectric constant of the insulating material; D' is the diameter of the first core 7 and the second core 8; d ’ is the diameter of the copper conductor core 11.

[0043] Due to the cable's extreme length, the cable signal attenuation during transmission will inevitably increase, provided the cable attenuation coefficient α remains unchanged. To reduce signal attenuation during transmission and ensure transmission quality over 10,000-meter cables, the cable attenuation coefficient must be reduced. To reduce the attenuation coefficient α, the cable's DC resistance R and capacitance C must be reduced. To reduce the DC resistance R, given a fixed length L, materials with low resistivity ρ must be selected and the conductor cross-sectional area S must be increased. Increasing the conductor cross-sectional area effectively means increasing the conductor diameter d. ’ To reduce the capacitance C, it is necessary to select an insulating material with a low dielectric constant ε and increase D ’ / d ’ It can be concluded that to reduce α, we need to reduce R and C, and to reduce R, we need to increase the conductor diameter d ’ , increase d,D ’ / d ’ will decrease (D ’ Under the premise of no change), the capacitance C must be increased; increasing d ’ At the same time, if the capacitance C remains unchanged or decreases, D must be increased at the same time. ’ , D ’ Increasing the cable diameter will result in a larger overall cable diameter. Within the standard requirements, moderately increasing the cable diameter to increase D and d, while simultaneously selecting low ρ and ε, will simultaneously reduce R and C, ultimately reducing the attenuation coefficient α. When selecting low-ε insulation materials, consider their temperature resistance and electrical performance.

[0044] S2. The first copper conductor 1 and the second copper conductor 9 are twisted in a regular manner to obtain a copper conductor core 11;

[0045] S3. Wrap an insulating layer around the outer side of the copper conductor core 11 to obtain a first core 7 and a second core 8. Twist the first core 7 and the second core 8 in a regular 1+6 pattern, and provide a shielding layer 5 on the outer side of the second core 8. Provide a semiconductive filling layer 4 between the second core 8 and the first core 7 and between the second core 8 and the shielding layer 5. Provide a filler 3 between the second core 8 and the shielding layer 5.

[0046] S4. Calculate the wire diameters of the first and second layers of steel wire 10 based on the breaking force of the first layer of steel wire 6 and the breaking force of the second layer of steel wire 10;

[0047] The calculation formula for calculating the steel wire diameter of the first layer steel wire 6 and the second layer steel wire 10 is as follows:

[0048]

[0049] Where: F is the breaking force of the steel wire; P is the tensile strength of the steel wire; S1 is the cross-sectional area of the steel wire; D1 is the diameter of the steel wire.

[0050] S5. Calculate the number of steel wires in the first layer 6 and the second layer 10 based on the obtained wire diameter;

[0051] The calculation formula for calculating the number of steel wires in the first layer 6 and the second layer 10 is as follows:

[0052]

[0053] Where: Z is the number of steel wires; D is the diameter of the steel wire after armoring; D1 is the wire diameter; l1 is the armor pitch; and l2 is the wire strand length. The calculation shows that there are 22 steel wires 6 in the first layer and 22 steel wires 10 in the second layer.

[0054] S6. Use an armoring machine to twist the first layer of steel wires 6 on the outside of the shielding layer 5, twist the second layer of steel wires 10 on the outside of the first layer of steel wires 6, and coat the surfaces of the first layer of steel wires 6 and the second layer of steel wires 10 with a galvanized aluminum alloy anti-corrosion layer.

[0055] The following table shows the technical parameters of the cables used in this application:

[0056]

[0057]

[0058] The present invention is described by way of example, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. Furthermore, under the teachings of the present invention, these features and embodiments may be modified to suit specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be within the scope of the present invention.

Claims

1. A load-bearing detection cable with a depth exceeding 10,000 meters, characterized in that: The first core wire (7) and the second core wire (8) comprise a copper conductor core (11) and an insulating layer (2), wherein the insulating layer (2) is arranged on the outside of the copper conductor core (11), the second core wire (8) is arranged around the first core wire (7), a shielding layer (5) is arranged around the second core wire (8), a semi-conductive filling layer (4) is arranged between the second core wire (8) and the first core wire (7) and between the second core wire (8) and the shielding layer (5), a filler (3) is further arranged between the second core wire (8) and the shielding layer (5), and a steel wire armor is arranged around the outside of the shielding layer (5).

2. The load-bearing detection cable for over 10,000 meters deep according to claim 1, characterized in that: The copper conductor core (11) comprises a first copper conductor (1) and a second copper conductor (9), wherein the second copper conductor (9) is arranged around the first copper conductor (1), and the number of the second copper conductor (9) and the number of the second core wire (8) are both six.

3. The load-bearing detection cable for over 10,000 meters deep according to claim 1, characterized in that: The steel wire armor comprises a first layer of steel wires (6) and a second layer of steel wires (10), wherein the first layer of steel wires (6) is arranged around the shielding layer (5), and the second layer of steel wires (10) is located outside the first layer of steel wires (6). Sealing material is applied to the surfaces and gaps of the first layer of steel wires (6) and the second layer of steel wires (10), and the components of the sealing material include diesel, asphalt, glycerin, wire rope oil, rail oil, rust-proof oil, green alumina, talcum powder or graphite.

4. The load-bearing detection cable for over 10,000 meters deep according to claim 3, characterized in that: The number of the first layer steel wires (6) and the number of the second layer steel wires (10) are both twenty-two, the breaking force of the first layer steel wires (6) is greater than 2595N / piece, and the breaking force of the second layer steel wires (10) is greater than 4415N / piece.

5. The load-bearing detection cable for over 10,000 meters deep according to claim 3, characterized in that: The surfaces of the first layer of steel wires (6) and the second layer of steel wires (10) are plated with a zinc-aluminum alloy anti-corrosion layer.

6. The load-bearing detection cable for over 10,000 meters deep according to claim 1, characterized in that: The insulating layer (2) is tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer.

7. A method for producing the aforementioned over 10,000-meter deep ground load-bearing detection cable, characterized in that: The following steps are involved: S1. When the resistances of the first copper conductor (1) and the second copper conductor (9) are known, the cross-sectional areas of the first copper conductor (1) and the second copper conductor (9) are calculated and the corresponding first copper conductor (1) and second copper conductor (9) are selected; S2. The first copper conductor (1) and the second copper conductor (9) are twisted in a regular manner in a 1+6 manner to obtain a copper conductor core (11); S3. Wrapping an insulating layer on the outside of the copper conductor core (11) to obtain a first core wire (7) and a second core wire (8), twisting the first core wire (7) and the second core wire (8) in a regular manner of 1+6, and providing a shielding layer (5) on the outside of the second core wire (8), providing a semi-conductive filling layer (4) between the second core wire (8) and the first core wire (7) and between the second core wire (8) and the shielding layer (5), and providing a filler (3) between the second core wire (8) and the shielding layer (5); S4. Calculate the wire diameters of the first layer of steel wire (6) and the second layer of steel wire (10) based on the breaking force of the first layer of steel wire (6) and the breaking force of the second layer of steel wire (10); S5. Calculate the number of steel wires in the first layer (6) and the second layer (10) based on the obtained wire diameter; S6. Using an armoring machine, the first layer of steel wires (6) are twisted on the outside of the shielding layer (5), the second layer of steel wires (10) are twisted on the outside of the first layer of steel wires (6), and a zinc-aluminum alloy anti-corrosion layer is plated on the surface of the first layer of steel wires (6) and the second layer of steel wires (10).

8. The method for producing a load-bearing detection cable exceeding 10,000 meters in depth according to claim 7, characterized in that: The calculation formula for calculating the cross-sectional area of the first copper conductor (1) and the second copper conductor (9) in step S1 is as follows: Where: α is the cable attenuation coefficient; R is the cable DC resistance; C is the cable capacitance; ω is the angular frequency; ρ is the resistivity; S is the cross-sectional area of the copper conductor; L is the conductor length; ε is the dielectric constant of the insulating material; D' is the diameter of the first core (7) and the second core (8); d ’ is the diameter of the copper conductor core (11).

9. The method for producing a load-bearing detection cable exceeding 10,000 meters in depth according to claim 7, characterized in that: The calculation formula for calculating the steel wire diameters of the first layer of steel wires (6) and the second layer of steel wires (10) in step S4 is as follows: Where: F is the breaking force of the steel wire; P is the tensile strength of the steel wire; S1 is the cross-sectional area of the steel wire; D1 is the diameter of the steel wire.

10. The method for producing a load-bearing detection cable exceeding 10,000 meters in depth according to claim 7, characterized in that: The calculation formula for calculating the number of steel wires in the first layer (6) and the second layer (10) of steel wires in step S5 is as follows: Where: Z is the number of steel wires; D is the diameter of the steel wire after armoring; D1 is the diameter of the steel wire; l1 is the pitch of the steel wire armor, and l2 is the stranded length of the steel wire.

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