RU14473U1 - CABLE FOR SUBMERSIBLE OIL PUMPS - Google Patents

Description

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Cable for submersible oil pumps

The utility model relates to the field of electrical engineering, namely to the construction of cables designed to power the electric motors of submersible oil pumps used for pumping oil.

A cable for submersible oil pumps is known, comprising three conductive rubber insulated copper conductors twisted and coated with a common rubber sheath, over which varnished windings, a braid of cotton yarn, and armor made of profiled galvanized steel tape, cable type KRBK 1 are sequentially applied.

However, this cable has a low service life, especially in oil wells with reservoir fluid containing a large amount of gases and aggressive substances. When the cable is used in such conditions, the rubber insulation rapidly ages and the shell breaks due to desorption of the absorbed gas.

The closest known among those proposed by technical essence is a cable for submersible oil pumps, containing three parallel-laid copper conductors, each of which is coated with polymer insulation from high density polyethylene and also a sheath made of high density polyethylene. On top of the conductors, a common winding of synthetic fabric or polymer tape and armor of galvanized steel tape 2 are applied.

A disadvantage of the known cable is its low durability in the conditions of its operation due to the aging process of polymer insulation in contact with a copper core, accelerating this process.

The task was to develop a cable design for submersible oil pumps with a copper conductive core, which has a high resource of work in conditions of exposure to formation fluid at temperatures up to 95 ° C as well as in air

 ° 2 g “MKI 6 HOI B 7/08

at temperatures from -60 to + 50 ° C.

This problem is solved in that in the cable for submersible oil pumps, containing three parallel-laid copper conductive conductors, each of which is coated with polymer insulation and a sheath, and sequentially laid on top of them a common winding of synthetic fabric or polymer tape and armored coatings of steel galvanized tapes, polymer the insulation and the shell are made of block copolymer of propylene with ethylene, including 0.1 - 0.6 may. % copper deactivator.

The proposed technical solution is illustrated by the drawing.

The drawing shows a cable in cross section.

The cable contains a copper conductive core 1, a polymer insulation 2 and a sheath 3, each of which is made of a block copolymer of propylene with ethylene, a winding 4 of synthetic fabric or polymer tape, and armor cover 5 of galvanized steel tape.

The following is information confirming the feasibility of implementing a utility model.

On the extruder, conductive core 1 is sequentially coated with insulation 2 from a block copolymer of propylene with ethylene and a shell 3 from the same block copolymer of propylene with ethylene. On top of the conductive conductors 1, laid in parallel, on the tape wrapping machine, the winding 4 is made of synthetic fabric or polymer tape. The overlay of the armor cover 5 on the cable is carried out on an armoring machine with positive rewinding of a galvanized steel tape having a stepped profile.

As the insulation material and the sheath, a propylene block copolymer with ethylene of grade 02015 3 is used. The block copolymer contains 0.1-0.6 wt.% Copper deactivator.

as copper deactivators, a product manufactured by Ciba (Switzerland) under the brand name Irganox MD 1024 or a product from Uniroyal Chemical (Great Britain) under the brand name Naugard XL-1 4 can be used.

After curing at 135 ° C in contact with copper for 7 days, the block copolymer of propylene with ethylene grade 02015 containing 0.5% Irganox MD 1024 practically does not change its mechanical characteristics, whereas the same material that does not contain MD 1024 3040% reduction in tensile strength and 70-80% relative elongation at break.

Thus, the technical result is to expand the range of operating temperatures and increase the service life of the cable.

Sources of information

1. D.S.Bachelis et al. Electrical cables, wires and cords. Moscow-Leningrad, Gosenergoizdat, 1963, p. 272.

2.N.I. Belarus and others. Electric cables, wires and cords. Moscow, Energoizdat, 1987, p.128.

3.G. Orphan. Modification of the structure and properties of polyolefins. L., "Chemistry, 1974, p.23.

4.US Patent No. 3,772,245, cl. 260-45.85N, 1973

Claims (1)

Cable for submersible oil pumps, containing three parallel-laid copper conductive conductors, each of which is coated with polymer insulation and a sheath, and sequentially laid on top of them a common winding of synthetic fabric or polymer tape and armored coatings of galvanized steel tapes, characterized in that the polymer insulation and sheath made of block copolymer of propylene with ethylene, including 0.1-0.6 wt.% copper deactivator.