Electric cable for feeding submersible oil-extraction pump motors

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

 

Electric cable for power supply of electric submersible neftenaliv relates to subsurface equipment of oil wells and can be used to power electric motors submersible oil pumps.

Known cable containing at least three conductive wires, each of which is made of copper wire with two successive insulating layers of polymer material, the bandage in the form of a tape of thermally bonded needle-punched fabric and located on top of the bandage armor of metallic corrosion-resistant tapes, and as a polymer material for the first insulation layer used cross-linked polyolefin, made using the exposure beam directional electrons in the air, and as the polymer material for the second insulation layer used thermoplastic elastomer-based hydrogenated block phenylethanoic copolymers (MCI NV 7/18. A useful model of the Russian Federation No. 41917. Published: 10.11.2004).

This solution allows you to use the cable in the wells, but this layout and the alternating layers of downhole fluid affects the insulation of polymeric material which swells and loses its dielectric strength.

Known cable for submersible pumps, the content is of ASHI parallel conductive wires, each of which is covered with two layers of insulation and a metal shell entered into a common armor made of corrosion-resistant metal strip, characterized in that the first insulation layer made of PTFE, a second layer of ethylene propylene diene monomer rubber, and the shell is of copper or steel, and the shell have transverse corrugations (MCI NV 7/00. A useful model of the Russian Federation No. 31173. Declared 04.01.2003 No. 2003100003/20. Published: 20.07.2003).

This solution cable design prevents penetration of the well fluid in the insulation of the cable, but when alternating current in a steel shell that has every lived, there will be a loss that will warm up the cable and bring it down. (Basic cable equipment / Waspresented, IDA, Sdialogue, Iberezov / edited Waspresented. M: Energy, 1975. 472 S.).

The indentation of the lower sections of the corrugation in isolation unevenly along the length of the thin insulation and can lead to the breakdown of the insulation when the deflection of the cable during descent or ascent.

The objective of the proposed technical solution is to create a cable with a larger, relatively analogues, service life, suitable for use in oil wells, in terms of the direct impact of borehole fluid on the electrical cable.

The task to solve due to the fact that the electrical cable for Pete the Oia motors submersible neftenaliv consists of parallel conductive wires, the isolated polymer material, over which is more airtight metal non-magnetic flexible shell made therein transverse corrugations, while the corrugations are made with the convexity directed from the veins and are located at intervals along the length of the cable, the smaller longitudinal dimension of the flute, this flute is one sheath placed against bumps shell adjacent veins.

The use of additional hermetic metal non-magnetic flexible shell made it corrugations, while the corrugations are made with the convexity directed from the veins, and are spaced along the length of the cable, the smaller longitudinal dimension of the corrugations, the corrugations when one shell is placed against bumps shell adjacent veins provides longitudinal tightness, enables the insulation layer, as reliably seals the insulation, and thus protects it from the ingress of wellbore fluid, while maintaining appropriate flexibility of the cable.

The use of a nonmagnetic metal avoids the induction of currents in a protective sheath and failure of the cable.

The drawing shows an electric cable with longitudinal intervals of size L2between the corrugations is less than the longitudinal longitudinal L1the size of the corrugations, where the tape armor 1, 2 pillow, Gapirov the bedroom sheath 3, insulation 4, conductor 5, the corrugations 6, the spaces between the corrugations 7, the longitudinal dimension L1flute, the longitudinal dimension L2period.

Electric cable made as follows.

Electric cable consists of conductive wires 5 that are parallel to the isolated polymer material 4, over which is more airtight metal non-magnetic flexible sheath 3 made it corrugations 6 with a longitudinal dimension L1, which are made with the convexity directed from the veins, and are located at intervals of 7 longitudinal dimension L2the cable length less than the longitudinal dimension L1corrugation 6, with the corrugations of one sheath placed against bumps shell adjacent veins.

The conductors 5 and the corrugated sheath 3 are separated from each other and from the overall armor 1 pillow from non-woven cloth 2 to reduce friction during bending of the cable.

When the gap 7 between the corrugations, which is smaller than the longitudinal size of the corrugations 6, the electrical cable has a greater width relative to the other cables, but because of the corrugations of one sheath placed against bumps shell adjacent veins, it provides good flexibility of the cable.

Such cables is advantageous to operate in wells with large diameter tubing.

The totality of the prize is akov Nova and leads to the technical result introducing cable with a larger, relatively analogues, service life, suitable for use in oil wells, in terms of the direct impact of borehole fluid on the electrical cable.

Electric cable for power supply of electric submersible neftenaliv consisting of spaced parallel conductive wires, isolated polymeric material, over which is more airtight metal non-magnetic flexible shell made therein transverse corrugations, wherein the corrugations are made with the convexity directed from the veins, and are located at intervals along the length of the cable, the smaller longitudinal dimension of the flute, this flute is one sheath placed against bumps shell adjacent veins.



 

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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

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

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4 cl, 3 dwg

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1 cl, 2 dwg

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1 cl, 1 ex

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SUBSTANCE: proposed method involves spatial disposition of conducting communication lines which makes it possible to compensate for electromagnetic pickups in three-phase power circuits caused by self-induction and is based on compensating effect attained by superimposing electromagnetic inductances shifted in phase due to phase shift of currents carried by three adjacent conductors; novelty is that only positive (forward) currents carried by three adjacent layers and shifted in phase through 120 deg. are used in three-phase circuits. Passing three-phase current of same amplitude through three adjacent conducting tracks disposed strictly in parallel one on top of other in these three adjacent layers where columns built of conducting tracks occurring in three layers are formed we shall obtain equal-amplitude vectors in each layer using cyclic phase transfer; these vectors correspond to harmonic oscillations on vector diagram from all three phases (A, B, C).

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

9 cl, 1 dwg, 1 tbl

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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.

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1 cl, 1 dwg

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