Electric cable

FIELD: cable engineering; feeding submersible power systems of oil-extracting pump motors.

SUBSTANCE: proposed cable designed for use at depth of up to 3000 m, stratal liquid temperature of 140 to 210 °C, gas factor over 300 m3/t, and pressure of up to 30 MPahas current-carrying conductors insulated by radiation-modified polyethylene, sheath, pad, and armor, as well as additional sheath made of thermoelastic plastic layer, 0.2 to 0.7 mm thick, that covers insulation of each current-carrying conductor, surface layer of double-layer insulation being plasma pre-treated.

EFFECT: enhanced service life of cable.

1 cl, 1 dwg

 

Electrical cable refers to a cable technique and can be used to power the submersible electrical systems, mainly electric motors submersible oil pumps.

On the performance of the cables of the electrical submersible oil pumps is affected by borehole and other factors;

- the penetration of gas under pressure in the internal volume of the insulation, reducing the density of the insulation leads to increase of the leakage currents is to reduce the dielectric properties of insulation;

- the rise of ESP in the presence of gas in the insulation, reducing the density of the insulation, the radial microreserve (microcracks) isolation at inappropriate speeds lifting ESP lead to increased leakage currents is to reduce the dielectric properties of insulation;

the presence of hot water over 80°and introducing it in isolation leads to the connection of the hydroxyl group (OH) with the molecular structure of the insulation reduces dielectric properties of the insulation - increase leakage currents;

the erosion of the ingredients of isolation (special additives that increase the life of the cable) leads to a decrease in dielectric properties of the insulation - increase leakage currents;

- introduction of oily fluids dielectric character under pressure in isolation leads to the decrease of the density of the insulation material, ROS is the leakage currents;

- introduction of oily liquids under pressure in isolation, in a closed volume under buenaposada, leads to compression of the secondary veins and thinning of its side walls, the result of this effect is the appearance of longitudinal cracks on the sides of the secondary veins and increase leakage currents;

- introduction of chemicals in the amount of insulation, such as NaCl, H2S, hydrocarbon compounds and other causes chemical compound with the molecular structure of the isolation and growth of leakage currents;

high pressure affects the insulation.

Known cable Kitb - 120, on THE other 16. C-119-2002, "power Cables for submersible pumps, heat produced by JSC Kamkabel" (pril), where copper conductive wires, a two-layer insulation silassewell polyethylene cushion of needle-punched non-woven technical fabric and ponpoko of galvanized steel tape.

The disadvantage of the current design is the lack of adhesion. According to the GOST 51777-2001 "Cables for submersible pumps. General specifications in the manufacture of submersible cables insulated conductor cables must be longitudinally sealed when the differential pressure of the well fluid of 0.02 MPA for 5 m length within one and a half hours.

Insulation shall be of two-layer and a thickness of not less than 2.5 m is. When applying the first layer silassewell polyethylene material passes through the molten state and cooling it happens spatial molecular cross-linking due to the presence in the volume of the extrudable mass of the crosslinking agent. After applying the first layer isolated vein passes through several tubs of water with a gradual cooling and drying. Chilled insulated lived again enters the cylinder of the extruder for coating the second layer of insulating material is prepared silassewell mixture of polyethylene. When applying the second layer at the moment of contact the first layer and the second has a different molecular structure and between them there is no adhesion.

In the operation of the cable of this design in wells with a high gas content factor or when working at great depths (more than 2000 m, where there is a high pressure) between the insulating layers along the cable rises and gas downhole fluid, resulting in swelling of the insulation (see figure app.2), the decrease of the density, the implementation is not dielectric materials in insulation, electrical breakdown and, as a consequence, reduce the service life of the cable.

From the graph we see that the curve 2 (reflecting radiation-cross-linked polyethylene) has the highest percentage of swelling at appropriate temperatures than other materials.

Nai is more closest technical solution is a cable for power plants electrophrenic pumps KSBP-130, the working temperature 130°on THE other 16 K13-012-2002 Podilsky plant NP Podolskkabel" (pril)containing copper conductive core, a combined isolation of stitched and unstitched polyolefin, where the second layer is made of a block copolymer of propylene with ethylene, a pillow from the needle-punched fabric and buenaobra of galvanized steel tape.

Isolation of two layers made of polyolefins, they change their geometry at a temperature of 80°C and above, which negatively affects the stability of dielectric properties due to the introduction of oily fluids downhole formation. Therefore, this cable cannot be used at temperatures above 130°C.

This cable is available, the adhesion between the insulating layers, as these are two different material on the molecular structure. This leads to longitudinal leaky cable construction and, consequently, to a reduction in service life due to leakage and premature electrical breakdown of the insulation.

The percentage swelling of the second insulation layer at a temperature of -130°reaches 8-12%. (see figure app.2)

Curve one displays the swelling of the second insulation layer (shell), the material is a block copolymer of ethylene with propylene, the amount of swelling is less than the cross-linked polyethylene.

The above design does not meet the requirements of GOST R 5177-2001 "Cables for submersible pumps. General technical conditions". The insulated cores of the cables must be longitudinally sealed when the differential pressure of the well fluid of 0.02 MPA for 5 m length within one and a half hours.

The cable of this design is operated in wells at depths of up to 1800-2000 m with a small gas factor.

On Nefteyugansk field in 2000, the cable of this design, not tested in wells at depths greater than 2000 meters. Between the first insulation layer and the shell under pressure began to penetrate the gas from the well fluid.

At greater depths, the design should have a reliable adhesion between the insulating layer and between the upper insulating layer and a shell that protects the insulation.

The objective of the proposed technical solution is the increase of the service life when operating the cable at depths up to 3000 meters with a temperature of the reservoir fluid from 140 to 210°when the gas factor of more than 300 m3/t and pressure up to 30 MPa.

The task to solve due to the fact that the electrical cable contains isolated radiation-modified polyethylene conductive strands, shell, pillow and armor, and differs in that an additional shell made of thermoplastic elastomer with a thickness of 0.2-0.7 mm, located on the isolation of each of the conductive wires, pre-treated dps is smoi.

Accommodation chemically resistant shell made of thermoplastic elastomer on the surface layer of insulation, pre-treated plasma across the surface, leads to the fact that the adhesion between the insulation and thermoplastic elastomer reaches efforts separation from each other (when the width of the strip 2 cm) up to 480 KN (in the absence of a plasma processing surface of the insulation grip is missing completely), leads to improved cable design in terms of creating a secure connection (adhesion) shell material thermoplastic elastomer, polyethylene insulation on each conductor.

This secure connection between two different molecular structure of the material creates a comfortable environment for insulation of the cable, similar to the work in a dry environment, and allows us to use the cable of the proposed design at depths up to 3000 m with the presence of high content of gas factor, nearer to the bottom, in terms of the dynamic level of the well fluid with high pressure into the well to 25-30 MPa, not fearing the passage of gas and borehole fluid along the cable between the sheath and insulation.

Such design of the cable leads to the technical result consists in the fact that increased service life when operating the cable at depths up to 3000 meters with a temperature of the reservoir fluid from 140 to 210°With gas fact is re over 300 m 3/t and pressure up to 30 MPa.

Electrical cable shown in the drawing, where copper conductor 1, a two-layer insulation 2 of the radiation-modified polyethylene, the surface layer which is processed by the plasma, the protective sheath 3 made of thermoplastic elastomer, the cushion 4 of thermally bonded non-woven or needle punched technical cloth armor 5 of galvanized steel or cupro-Nickel coating of the tape.

Electric cable made as follows.

Electrical cable contains copper conductive wires 1, solid round cross-section up to 35 mm2that can have a covering on the surface of tin, silver and Nickel, or stranded in the cross-section of the conductors 35 mm2that have the insulation 2 of one or two layers of radiation-modified polyethylene having a good adhesion between the conductive housing and the first layer, between the first and second layers, as in the application of the second layer on the first material have the same molecular structure.

The protective sheath of thermoplastic elastomer 3, chemical resistant material to oils, hydrocarbons, etc. is applied on the surface of the insulation 2 each conductor, after surface treatment by plasma.

The thickness of the shell 3 is in the range of 0.2 to 0.7 mm. Thickness less than 0.2 mm is not reliable on mehanicheskij strength. Thickness of 0.7 mm is the maximum, on the basis of security. The increase in the thickness of the protective coating leads to unnecessary expenses.

Armor 5 made of steel tapes galvanized, with cupronickel plated or another chemical protection over the entire surface. Ponpoko 5 is performed by winding the tape around the folded insulated conductors with positive overlap with supercategory profile with EP lock in both directions along the length of the cable.

Electrical cable contains isolated radiation-modified polyethylene conductive strands, shell, pillow and armor, characterized in that the additional sheath made of thermoplastic elastomer with a thickness of 0.2-0.7 mm, located on the isolation of each of the conductive wires, while the surface layer of the dual layer insulation pre-treated plasma.



 

Same patents:

Electric cable // 2302678

FIELD: cable engineering; feeding submersible power systems, mainly submersible oil-extraction pump motors.

SUBSTANCE: proposed cable designed for trouble-free operation in depths of up to 3000 m at stratal liquid temperature of 140 to 160 °C and gas factor over 300 m3/t has current-carrying conductors covered with adhesive radiation-modified polyethylene layers, sheath, pad, and armor; common additional sheath is made of thermoplastic material, 0.1 - 1.0 mm thick on flat side and 1.0 - 1.5 mm, on lateral sides; it is disposed over three insulated conductors longitudinally placed in common plane and tightly fitted to one another through their plasma pre-treated insulation.

EFFECT: extended service life of cable.

1 cl, 1 dwg

Insulating sheath // 2270489

FIELD: electric insulation engineering; insulating sheaths possessing fire and heat resistance and screening effect.

SUBSTANCE: proposed insulating sheath characterized in high resistance to open flame, high temperatures up to 600 °C, acids, oil products, organic solvents, and microbiological impacts is made of threads having different composition and twisted together; one of threads is made of arimide fiber and functions as reinforcing warp, and other one is made in the form of metal thread, more than 0.018 and less than 0.020 mm thick, that functions as shielding component. Coated or non-coated metal wire is used as shielding component. Reinforcing warp can be made in the form of harness of at least two arimide threads twisted together or it may have a few pairs of arimide fiber threads and metal thread twisted together; these pairs are interwoven to form ribbon or cloth.

EFFECT: enhanced fire resistance and flexibility, reduced weight of insulating sheath.

5 cl, 1 tbl

FIELD: electrical and radio engineering.

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2 cl, 6 dwg

Electric cable // 2256969

FIELD: electrical engineering; electric cables for signaling, control, and data transfer and processing systems.

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1 cl, 4 dwg, 1 tbl

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Electric cable // 2256969

FIELD: electrical engineering; electric cables for signaling, control, and data transfer and processing systems.

SUBSTANCE: cable has at least one pair of insulated and stranded current-carrying conductors and cable sheath. Insulating material is either halogen-containing polymer (polyvinyl chloride), or halogen-free polyolefin base material (polyethylene), or its copolymer. Insulation thickness is chosen from equation strand pitch is found from equation h = 25(2Δ + d), where d is conductor diameter; εr is relative dielectric constant of insulating material. With diameter of cable current-carrying conductors being enlarged, capacitance of cable pair was reduced (other characteristics being retained at desired level.

EFFECT: enhanced capacitance of working load on cable pair.

1 cl, 4 dwg, 1 tbl

FIELD: electrical and radio engineering.

SUBSTANCE: proposed high-voltage conductor designed for erecting dc and ac power transmission lines and also for use as conductor of heavy-power low-frequency radio transmitting antennas has concentrically disposed weight carrying member, radius R1 conductor, internal semiconductor insulating layer, external semiconductor insulating layer, and radius Re main insulating layer. Internal semiconductor insulating layer is required for fashioning current-carrying conductor in the form of round cylinder and for smoothing down irregularities capable of enhancing electric field strength and liable to cause partial discharges. External semiconductor insulating layer is used for fast equalization of potential throughout entire external surface of conductor. Operating voltage across conductor may exceed corona firing potential Vc in vicinity of insulator-air boundary by 1.4 to 3 times at specified corona power loss. Novelty is that relative radius x = Re/R1 and volume resistivity ρ of main insulating layer in high-voltage conductor with known corona-discharge current-voltage characteristic I(V1) and at specified corona power loss are interrelated by definite equations for frequencies f > fb and f < fb, where fb is value reverse to charge time constant of circuit set up of corona discharge resistance and total capacitance of system.

EFFECT: ability of conductor operation at voltage exceeding corona firing voltage near certain boundary.

2 cl, 6 dwg

Insulating sheath // 2270489

FIELD: electric insulation engineering; insulating sheaths possessing fire and heat resistance and screening effect.

SUBSTANCE: proposed insulating sheath characterized in high resistance to open flame, high temperatures up to 600 °C, acids, oil products, organic solvents, and microbiological impacts is made of threads having different composition and twisted together; one of threads is made of arimide fiber and functions as reinforcing warp, and other one is made in the form of metal thread, more than 0.018 and less than 0.020 mm thick, that functions as shielding component. Coated or non-coated metal wire is used as shielding component. Reinforcing warp can be made in the form of harness of at least two arimide threads twisted together or it may have a few pairs of arimide fiber threads and metal thread twisted together; these pairs are interwoven to form ribbon or cloth.

EFFECT: enhanced fire resistance and flexibility, reduced weight of insulating sheath.

5 cl, 1 tbl

Electric cable // 2302678

FIELD: cable engineering; feeding submersible power systems, mainly submersible oil-extraction pump motors.

SUBSTANCE: proposed cable designed for trouble-free operation in depths of up to 3000 m at stratal liquid temperature of 140 to 160 °C and gas factor over 300 m3/t has current-carrying conductors covered with adhesive radiation-modified polyethylene layers, sheath, pad, and armor; common additional sheath is made of thermoplastic material, 0.1 - 1.0 mm thick on flat side and 1.0 - 1.5 mm, on lateral sides; it is disposed over three insulated conductors longitudinally placed in common plane and tightly fitted to one another through their plasma pre-treated insulation.

EFFECT: extended service life of cable.

1 cl, 1 dwg

Electric cable // 2303307

FIELD: cable engineering; feeding submersible power systems of oil-extracting pump motors.

SUBSTANCE: proposed cable designed for use at depth of up to 3000 m, stratal liquid temperature of 140 to 210 °C, gas factor over 300 m3/t, and pressure of up to 30 MPahas current-carrying conductors insulated by radiation-modified polyethylene, sheath, pad, and armor, as well as additional sheath made of thermoelastic plastic layer, 0.2 to 0.7 mm thick, that covers insulation of each current-carrying conductor, surface layer of double-layer insulation being plasma pre-treated.

EFFECT: enhanced service life of cable.

1 cl, 1 dwg

Electric cable // 2309474

FIELD: cable engineering; feeding submersible power systems, primarily electric motors of submersible oil pumps.

SUBSTANCE: proposed oil-pump motor feeding cable designed for long-time service in boreholes at depths up to 3 000 m and stratal liquid temperatures of 80 to 210 °C has insulated current-carrying conductors and thermoelastolayer sheath disposed on each conductor and/or on all conductors; conductor insulation is made of acid-free radiation-modified high-density polyethylene and sheath, of thermoelastolayer. Such mechanical design of cable whose conductors are covered with air-tight insulation provides for radiation modification of high-density polyethylene dispensing with specific mechanical devices and attachments.

EFFECT: improved electrophysical and mechanical characteristics of insulation maintained even at high-speed cable lifting upon long-time service in boreholes; extended cable service life.

1 cl, 2 dwg, 1 tbl

FIELD: electrical engineering including cable engineering; midget control cables for wire communication lines of small-size missiles and their manufacturing process.

SUBSTANCE: proposed midget control cable has two electrically insulated enameled copper conductors (current-carrying conductors), one strengthening complex thread of cross lea securing winding of three polyamide threads forming thread assembly, as well as four strengthening complex threads placed on top of cross securing winding in parallel with copper conductors, two-layer lea winding of two polyamide threads wound in opposite directions, and one complex thread. Proposed method for manufacturing midget control cable includes manufacture of thread assembly followed by finishing midget control cable for which purpose four strengthening complex threads are arranged in parallel with thread assembly and two-layer winding is placed overall.

EFFECT: improved electrical and mechanical characteristics, ability of using cable immersed in water including sea water.

2 cl, 3 dwg

FIELD: electrical engineering including cable engineering; midget control cables for wire communication lines of small-size missiles and their manufacturing process.

SUBSTANCE: proposed midget control cable has two electrically insulated enameled copper conductors (current-carrying conductors), one strengthening complex thread of cross securing lea winding of three polyamide threads forming thread assembly, as well as seven strengthening complex threads placed on top of cross securing winding in parallel with copper conductors, and secondary securing winding of one complex strengthening thread; thread assembly is impregnated with water-repelling liquid. Proposed method for manufacturing midget control cable includes manufacture of thread assembly followed by finishing midget control cable for which purpose seven strengthening complex threads are arranged in parallel with thread assembly whereupon finished midget control wire is wound on take-in reel.

EFFECT: improved electrical and mechanical characteristics, ability of using cable immersed in water including sea water.

2 cl, 2 dwg

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SUBSTANCE: method is described for manufacturing of electric cable (10), comprising at least one core, which includes conductor (1) and insulating coating (2), which surrounds conductor, at the same time method includes the following stages: supply of polyolefine material, cross-linking system on silane basis and foam generation system, comprising at least one exothermic foaming agent in amount of at least 0.1% - 0.5% (wt) per total mass of polyolefine material; production of polyolefine material mixture, cross-linking system on silane basis and foam generation system; and extrusion of mixture to conductor (1) to make insulating coating (2). Also electric (10) is described, which comprises at least one core, which consists of conductor (1) and insulating coating (2), which surrounds mentioned conductor (1) and is in contact with it, at the same time insulating coat (2) mainly consists of a layer of foamed silane-linked polyolefine material, characterised with extent of foaming in the range from 3% to 40%.

EFFECT: increased flexibility of cable, improved mechanical characteristics and electric properties.

55 cl, 6 tbl, 6 ex

Electric cable // 2424592

FIELD: electricity.

SUBSTANCE: electric cable includes current-conducting cords insulated with thermoplastics and sheath from thermoplastic elastomer, which is located on each cord and/or on all together; at that, cord insulation is made from oxygen-free-radiation-modified thermoplastic material through sheath, and sheath is made from thermoplastic elastomer soaked with non-saturated hydrocarbons. Saturation of insulation from thermoplastic material with non-saturated hydrocarbons also improves cable characteristics. Gap made between insulated cords in cable with common sheath increases its operating life.

EFFECT: longer operating life of cable at operation in contact with corrosive medium.

7 cl, 2 dwg

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