RU79212U1 - CABLE FOR INSTALLATION OF SUBMERSIBLE ELECTRIC PUMPS - Google Patents

Abstract

The utility model relates to the cable industry, namely, to cable designs designed to supply electrical energy to electric motors of oil production, water lifting and pumping liquids to a rated alternating voltage of up to 4 kV of a frequency of 50 Hz. The main factors of economic efficiency are: - increased service life installations of submersible electric pumps by reducing cable failures due to swelling of the insulation.

Description

The utility model relates to the cable industry, namely, to cable designs designed to supply electrical energy to electric motors of oil production, water lifting and pumping liquids to a rated alternating voltage up to 4 kV of a frequency of 50 Hz.

The closest analogue of the development can be considered a cable for submersible oil pumps, containing three parallel-laid copper conductive cores, each of which is coated with a polymer insulation and a sheath made of block copolymer of propylene with ethylene, including 0.1-0.6 wt.% Copper deactivator, and sequentially applied on top of them is a common winding of synthetic fabric or polymer tape and armor plates made of galvanized steel tapes (Patent PM PM No. 14473).

When operating cables due to the effects of well fluid, the insulation and cable sheath swell. Because the armor forms a closed space for isolated cores, the insulation and the shell are deformed, filling the free space. The insulation of the outer cores compresses the middle core, and the profile of the latter acquires a square shape, and the insulation thickness at the points of contact of the wires decreases. This can lead to electrical breakdown of the insulation and, as a result, to failure of the installation.

The same thing, only to a lesser extent, occurs without exposure to well fluid due to the thermal expansion of the insulation materials and the sheath when the cable is heated.

To solve this problem, the cable being developed uses winding of fibrous material over the shells, which acts as a damper during swelling or thermal expansion of the insulation and sheath materials. Instead of fibrous material, film material can be used provided that it is more prone to deformation than the insulation material and

shell. When the shell swells, the damper layer deforms, while the insulation and shell profiles do not lose their shape.

In addition, in the manufacture of the cable, the damper layer reduces the effect of tape armor, the lock of which has protrusions, when applied to the sheath.

The use of a winding over the sheaths of the cable cores to power the motors of submersible pumps will allow

1. Increase the life of the insulation, sheath and cable as a whole.

3. To increase the overhaul period of wells by reducing the failure of cables with insulation from block copolymer of propylene with ethylene.

Figure 1 shows a cross section of the claimed cable design. The cable contains three copper conductive conductors (1), designed to transmit electrical energy to the electric motor of a submersible pump. Insulation (2) and a sheath (3) of a block copolymer of propylene with ethylene, comprising 0.1-0.6 wt.% Copper deactivator, a winding of fibrous material (4) were applied over the cores. On top of the cores laid in the same plane, a common cushion (5) of non-woven fabric tapes or rubberized unvulcanized fabric tapes and an armor (6) of steel corrosion-resistant tape were applied.

Bibliography:

1 - Utility Model Patent No. 14473 “Cable for Submersible Oil Pumps”;

2 - GOST R 51777-2001 "Cables for the installation of submersible electric pumps."

Claims (1)

An electric cable for submersible electric pump installations, containing conductive conductors laid parallel in one plane or twisted together, each of which is coated with an insulation and a sheath made of a block copolymer of propylene with ethylene, comprising 0.1-0.6 wt.% Copper deactivator, enclosed in corrosion -resistant tape armor, characterized in that over the sheath of each core a winding of fibrous or film material is performed in order to reduce mechanical stresses on the insulation during cable operation and during I produced it when applying armor.