RU80057U1 - 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 up to 4 kV of a frequency of 50 Hz. These cables can be used to power submersible electrical installations in wells with complicated geological and chemical conditions. The main factors of economic efficiency are: - increase the service life of submersible electric pump installations by reducing cable failures under the influence of vibration loads.

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.

These cables can be used to power submersible electrical installations in wells with complicated geological and chemical conditions.

The closest analogue of the development can be considered an electric cable for submersible electric pump installations, containing conductive conductors with insulation from ethylene-propylene rubber in a lead sheath and a protective cover (Patent for PM No. 35470).

A significant disadvantage of the analogue can be considered the use of lead as a shell material.

In addition to low mechanical strength, lead has significant fluidity, which must be reckoned with when laying cables vertically in a bare lead sheath. This fluidity increases with increasing temperature. A major disadvantage of lead shells is their low resistance to vibration loads, especially at elevated temperatures. Vibration resistance is significantly reduced if lead is in a tense (tense) state. [2]

These factors are of great importance since the cable for the installation of submersible electric pumps operates in a vertical tension state when exposed to vibration and at temperatures up to 230 ° C. The vibration resistance of lead shells can be increased if not pure lead is used, but its alloys, which have higher mechanical strength and vibration resistance, as well as lower fluidity. [2]

The use of lead-antimony alloy as the material of the cable sheath for powering the motors of submersible electric pumps will allow:

1. To expand the scope of the cable, because there will be no vibration limits.

2. Increase the life of the lead sheath and the cable as a whole.

3. To increase the overhaul period of wells by reducing cable failures in lead shells.

To further improve the resistance of the shell to runoff during vertical laying and to prevent deformation of the shell during the application of armor, it is proposed to use a bandage made in the form of a winding of synthetic tape and / or braid of synthetic threads.

Figure 1 shows a cross section of the claimed cable design. The cable contains three copper conductive conductors (1), designed to transfer electric energy to the electric motor of a submersible pump, covered with a sublayer of polyimide-fluoroplastic films (6). On top of the sublayer, insulation of ethylene propylene rubber (2), a shell of lead-antimony alloy (3), a braid of synthetic threads (7) were applied. On top of the cores laid in the same plane, a common cushion (4) of non-woven fabric tapes or rubberized unvulcanized fabric tapes and armor (5) of steel corrosion-resistant tape were applied.

Bibliography:

1 - Patent for utility model No. 35470 "Electric cable";

2 - V. A. Privezentsev "Fundamentals of cable technology", Energy, M. 1975.

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

Claims (3)

1. An electric cable for installations of submersible electric pumps, comprising conductive conductors laid parallel in one plane or twisted together, each of which is coated with ethylene-propylene rubber insulation and a sheath and bandage made in the form of a winding of synthetic tape and / or braid of synthetic threads, enclosed in a corrosion-resistant tape armor, characterized in that the shell is made of lead-antimony alloy. 2. The cable according to claim 1, characterized in that the lead-antimony alloy contains, wt.%: Antimony 0.05-12.0; copper 0.005-1.2; tellurium 0.005-1.2; the rest is lead. 3. The cable according to claim 1, characterized in that between the conductive core and rubber insulation there is a sublayer of materials selected from the group: fluoroplastic film, polyimide-fluoroplastic film, enamel insulation, and combinations thereof.