Electric cable

FIELD: cable engineering; cables for feeding submersible oil-extraction pump motors and other submersible units.

SUBSTANCE: proposed electric cable designed for use at depths exceeding 2000 m has cylindrical insulated current-carrying conductors disposed in same plane, sheath, and armor of shaped steel band; its three conductors are tightly fitted through their insulation to one another throughout their entire length and covered with their common sheath to form wedges of sheath material in-between; thickness of common sheath on flat sides ranges between 0.7 and 1.0 mm and on lateral sides, between 1.0 and 1.5 mm. This cable is characterized in that it retains its insulation integrity upon pre-connection splicing and during lifting-and-lowering operations in sloping wells, its intermediate conductor is not crushed at points of contact with two lateral conductors when used at high temperatures.

EFFECT: enhanced service life.

1 cl, 1 dwg

 

Electric cable for power supply of electric submersible neftenaliv relates to a cable technique and can be used to power the submersible electrical systems.

On the performance of cables 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;

- inappropriate speed hoist installations of electrically driven centrifugal pumps (ESP) in the presence of gas in isolation leads to the decrease of the density insulation, radial microreserves (cracked) isolation, to increase leakage currents is to reduce the dielectric properties of insulation;

the presence of hot water over 80°and introducing it in isolation facilitates 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;

- introduction of oily fluids dielectric character under pressure in isolation leads to the decrease of the density of the insulation material and increase leakage currents; shorten sluzbacelna;

- introduction of oily liquids under pressure in isolation, in a closed volume under buenaposada, leads to increased isolation of three lived in the 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, leads to a chemical compound with the molecular structure of the isolation and growth of leakage currents;

high pressure affects the insulation.

Known technical solution "Cable for submersible pumps" in patent SU 1742863, IPC 5 NW 7/18, from 1990.01.15, publ. 1992.06.23 where the cable containing insulated, located in the same plane veins with a filling between them, the filling is made in the form of strips of insulation material with longitudinal grooves adjacent to the surface of the insulation and gaskets and grooves are arranged symmetrically relative to the plane passing through the centers of the insulated conductors and the thickness of the strips is less than their diameter.

The design is quite well-versed in cutting and splice cables, but laid separate strip insulation between conductors in this design do not perform a security function isolation from the ASD is counteracted efforts during tripping operations Necheporenko cable and operating temperatures up to 100° With in the well.

This technical solution allows to reduce the deformation of the insulation by reducing the effect of lateral insulated conductors on the middle vein (while expanding its volume) in a closed space, in the area of minimum thickness of the strip, but it does not protect the insulation from the introduction of extraneous materials indicated above, that lower dielectric insulation properties.

The famous "electric cable" on the author's certificate of the USSR No. 1695399, IPC 7 NW 7/00, NV 7/08, from 1989.07.04, publ. 1991.11.30 to power the electric motors of submersible neftenaliv containing three insulated strands with shells of diameter D, one of which is located between the other two, a pillow under armor and the total armor of shaped steel tape, with the inner surface of the cushion is made with the guide of rectangular form, located under the said housing, the height of the protrusion is 0,05-0,07)D, and width (0,70-0,95)D; a ledge formed by a gasket in one piece with the cushion under armour.

However, this does not save the isolation of secondary veins from squeezing the two side conductors. The impact of lateral veins still happens, just not in a straight line and at an angle. Is the thinning of the insulation longitudinally along the middle vein, cracking, and reduction of life time.

The closest in technical essence I have is the Cable KABP" beyond 16-505-129-82 VNIIKP, page 4, 1, 3, (pril) with copper conductors, polyethylene insulation - the first insulation layer, the second insulation layer, with a total shell of polyethylene, armored, flat. The proposed General shell protects the geometry of the isolated conductive wires when its in the downhole fluid at a temperature of 70-90°C.

When preparing a cable for operation, when cutting the cable and the joint, the insulation between adjacent conductors, as a rule, damaged, its dielectric properties deteriorate. Because of this, during operation of the cable, in the early stage, there is increased leakage currents and then the electrical breakdown of the insulation.

The objective of the proposed technical solution is the increase of the service life when operating the cable at depths of over 2000 metres, the integrity of the insulation after cutting for connection and round-trip operations in inclined wells, saving crushing isolation of secondary veins in places of contact with the other two side conductors when working in high temperatures.

The task to solve due to the fact that the electric cable for power supply of electric submersible neftenaliv comprises a cylindrical located in the same plane, insulated conductive wires, sheath and armour of steel profiled flax is s, with three veins densely pressed his isolation to each other across the length and covered a total shell with the formation wedges out of the sheath material between them; common shell on the flat sides are made with a thickness in the range of 0.7-1.0 mm, and on the sides - 1,0-1,5 mm

The location is in the same plane, cylindrical, insulated conductive wires, tightly pressed by the isolation to each other along the entire length, forming a wedge-shaped space between the insulation lived, in which when the cover shell material are formed wedge-shaped insert from the shell material, combined with a thin belt of the same material, to hold the geometry of the secondary veins when heating cable up to the critical temperature.

Metal armor placed around the shell, when the operation of the cable when the temperature is above a certain value, at which any insulating material increases in volume, has through the shell constrictive effect on the wedges, which securely retain the geometry lived and not give lateral veins under the influence of buenaobra to perform a compressing force isolation medium veins.

The shell thickness in the plane of the selected optimal, with a thickness in the range of 0.7-1.0 mm, and sufficient to create a solid monolith with wedges and holding them in the right place with regard to compression is roppokai, made by winding over a common shell. On the sides of the shell has a sufficient thickness of 1.0-1.5 mm, also saves the main insulation of the maximum pressure buenaobra with the technological operation of the cover shell.

This reliable design also allows easy cutting of the cable easily. Enough on the sides of the shell to make longitudinal incisions, the shell is easily removed from the isolation of living in different directions. Cut across the cable and removed without damaging the insulation.

The set of features is new and leads to the technical result consists in extending the service life of the cable at depths greater than 2000 meters, preserving the integrity of insulation at round-trip operations in inclined wells and saved from the crushing isolation of secondary veins in places of contact with the other two side conductors when working in high temperatures.

The drawing shows an electric cable for power supply of electric submersible neftenaliv, where the conductors 1, the layers of insulation 2 conductor, overall sheath 3, the cushion 4, the wedges 5, ponpoko 6.

Electric cable for power supply of electric submersible neftenaliv performed as follows.

Three insulated wires 1, tightly pressed her from what AZIA 2 to each other along the entire length, laid in parallel in the same plane with the help of a special device is covered with a total shell 3, creating a monolithic whole with educated longitudinal wedges between 5 isolated veins of membrane material between them and the General belt connecting these wedges. To prevent the violation of the geometry when the coating buenaposada 6 insulated conductors 1 overall sheath 3 on the flat sides are made with a thickness in the range of 0.7-1.0 mm, and on the sides - 1,0-1,5 mm on Top of these layers, place a pillow 4 of non-woven, needle-punched material and ponpoko 6.

Electric cable for power supply of electric submersible neftenaliv containing cylindrical located in the same plane insulated conductive wires, sheath and armour of steel profiled tape, characterized in that the three strands tightly pressed by the isolation to each other across the length and covered a total shell with the formation wedges out of the sheath material between them; common shell on the flat sides are made with a thickness of 0.7-1.0 mm, and on the sides - 1,0-1,5 mm



 

Same patents:

FIELD: oil well subsurface equipment; feeding submersible oil pump motors.

SUBSTANCE: novelty is that proposed electric cable designed for operation in oil wells in direct contact with well liquid to feed electric motors of submersible oil-extraction pumps has parallel conductors covered with polymeric insulating material and additional crosswise corrugated oil-tight nonmagnetic metal sheath overall; corrugations have bulges directed away from conductor and disposed throughout cable length at intervals smaller than corrugation longitudinal size; corrugations of one sheath are disposed opposite those of adjacent conductor sheath.

EFFECT: enhanced service life of cable operating in direct contact with oil well liquid.

1 cl, 2 dwg

FIELD: electrical engineering; cables for feeding underground equipment of oil wells such as submersible oil pump motors and other pieces of equipment.

SUBSTANCE: novelty is that proposed electric cable has at least two parallel polymeric material insulated current-carrying conductors, each conductor being also covered with metal band sheath coated on two sides with crosswise corrugated polymeric material longitudinally placed on insulation with its edges overlapping; conductors covered with mentioned sheath have common external armor of spirally arranged metal bands. Mentioned sheath provided with longitudinally disposed corrugated metal band having integral polymeric weld provides for desired tightness of insulation and for its reliable protection. Compared with prior art, proposed cable is characterized in its suitability for use in oil wells in direct contact with well liquids.

EFFECT: enhanced resistance to environmental impacts, enlarged service life of cable.

1 cl, 4 dwg

Electric cable // 2302049

FIELD: electrochemical industry; power cables for feeding submersible motors of oil pumps.

SUBSTANCE: proposed cable has current-conductors covered with first and second insulating layers, as well as protective pad and armor common for all conductors. Insulation is made of fluorine-containing copolymers which enhances cable thermal stability to 230 °C.

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9 cl, 1 dwg, 1 tbl

FIELD: printed-circuit boards, multilayer conductors, and ribbon cables.

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4 cl, 3 dwg

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1 cl, 1 ex

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SUBSTANCE: proposed cable that can be used to supply with power electrical loads and at the same time to transmit telephone, television, computer, and radio communication signals has one or more similar sections incorporating central flat current-carrying conductor disposed between two flat insulating tapes, the latter being disposed, in their turn, between two flat neutral conductors whose width is greater than that of current-carrying conductor by double thickness of insulating tape.

EFFECT: enhanced conductivity and enlarged functional capabilities of cable.

1 cl, 2 dwg

FIELD: electronic engineering; gas panel manufacture.

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1 cl, 1 ex

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4 cl, 3 dwg

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FIELD: electrochemical industry; power cables for feeding submersible motors of oil pumps.

SUBSTANCE: proposed cable has current-conductors covered with first and second insulating layers, as well as protective pad and armor common for all conductors. Insulation is made of fluorine-containing copolymers which enhances cable thermal stability to 230 °C.

EFFECT: reduced mass and size, enhanced thermal stability of cable.

9 cl, 1 dwg, 1 tbl

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EFFECT: enhanced resistance to environmental impacts, enlarged service life of cable.

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Electric cable // 2302681

FIELD: cable engineering; cables for feeding submersible oil-extraction pump motors and other submersible units.

SUBSTANCE: proposed electric cable designed for use at depths exceeding 2000 m has cylindrical insulated current-carrying conductors disposed in same plane, sheath, and armor of shaped steel band; its three conductors are tightly fitted through their insulation to one another throughout their entire length and covered with their common sheath to form wedges of sheath material in-between; thickness of common sheath on flat sides ranges between 0.7 and 1.0 mm and on lateral sides, between 1.0 and 1.5 mm. This cable is characterized in that it retains its insulation integrity upon pre-connection splicing and during lifting-and-lowering operations in sloping wells, its intermediate conductor is not crushed at points of contact with two lateral conductors when used at high temperatures.

EFFECT: enhanced service life.

1 cl, 1 dwg

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2 cl, 2 dwg

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