Electric cable

FIELD: cable engineering; feeding submersible power systems, primarily electric motors of submersible oil pumps.

SUBSTANCE: proposed oil-pump motor feeding cable designed for long-time service in boreholes at depths up to 3 000 m and stratal liquid temperatures of 80 to 210 °C has insulated current-carrying conductors and thermoelastolayer sheath disposed on each conductor and/or on all conductors; conductor insulation is made of acid-free radiation-modified high-density polyethylene and sheath, of thermoelastolayer. Such mechanical design of cable whose conductors are covered with air-tight insulation provides for radiation modification of high-density polyethylene dispensing with specific mechanical devices and attachments.

EFFECT: improved electrophysical and mechanical characteristics of insulation maintained even at high-speed cable lifting upon long-time service in boreholes; extended cable service life.

1 cl, 2 dwg, 1 tbl

 

Electrical cable refers to a cable technique and can be used to power the submersible electrical systems, mainly electric motors submersible neftenaliv.

On the performance of cables submersible motors neftenaliv 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;

- the rise of ESP in the presence of gas in the insulation, reducing the density of the insulation, the radial microreserve (microcracks) isolation at inappropriate speeds lifting ESP lead to increased leakage currents is to reduce the dielectric properties of insulation;

the presence of hot water over 80°and introducing it in isolation leads to 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 - increase leakage currents;

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

- introduction of oily liquids under pressure in isolation, in a closed volume under buenaposada, leads to 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, H2's 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.

(Assesement "Cables for the oil and gas industry", Tashkent, publishing house "Fan", 1972, p.28, 29).

The famous "electric cable" in patent RU No. 2109359 C1, 6 NW 7/18, from 1997.01.22, publ. 1998.04.20. Electrical cable contains three are located in parallel in the same plane as the conductors, each of which has a two-layer insulation compositions based on high density polyethylene, a pillow under armor in the form laid on top of lived unvulcanized rubberized fabric, the total armor of steel profiled tape, as well as an additional element isolation made of at least two PTFE tape, applied with an overlap of 30-50% on the inner insulation layer.

Due to the fact that on top of the second insulation layer are PTFE Le is you, between them there are air pockets that contribute to electrical breakdown of the insulation. This design is intended for operation in the temperature range of 90-110°With the downhole fluid and no more as polyethylene insulation at temperatures above these, we will lose the dielectric properties.

Closest to the technical essence is the design of the cable with insulation of radiation-modified high-density polyethylene (RM HDPE)manufactured Podolsky cable plant (Geplacea "Cables and wires used in the oil and gas industry", Perm-2004, str, 129, 3,6, pril), where isolation lived for increasing temperature durability process at electron accelerators in the presence of air.

When conducting the research investigated the behavior of the insulation resistance of RM HDPE in a liquid medium when the temperature changes. Work has shown that irradiation of polyethylene high density in the presence of air leads to a deep oxidative degradation, which, in turn, is accompanied by increased hydrophilicity isolation and, consequently, the intensification of the process of diffusion of a liquid in isolation. This contributes to a sharp increase in conductivity of insulation (reduced insulation resistance) with increasing temperature. This factor limits the use of radiatio the but-modified HDPE (high density polyethylene) as a two-layer insulation.

The dependence of the insulation resistance of different materials and temperature on samples with two-layer irradiated insulation from high density polyethylene (Geplacea "Cables and wires used in the oil and gas industry", Perm-2004, str, figure 3.6, pril).

Cable with double-layer insulated from the radiation-modified polyethylene insulation resistance starts to fall sharply with increasing temperature and at 102°With less than 50 Mω/km, instead of over 2500 Mω/km, the requirement of GOST R 51777-2001, (Novikov D.V. research and Development of heat-resistant cables for submersible neftenaliv. Avtoreferat dissertation on competition of a scientific degree of candidate of technical Sciences, M., 1999).

In the case of electron irradiation in the presence of oxygen, the fraction of energy spent on oxidation. The decomposition rate of the polymer under the influence of oxygen is increased, and the rate of crosslinking decreases.

Radiation oxidation of the surface and volume of polyethylene, substantially worsening electrophysical and mechanical characteristics insulation, has an impact not only on such structurally-sensitive characteristic, as tgδ (leads to its increase), but also other electrical characteristics, which is particularly pronounced with increasing temperature. Temperature coefficients diele the electrical permittivity of the LCξ and the specific insulation resistance of the LCρv during irradiation in air is higher than the irradiation in an inert atmosphere. In these cases vary as the absolute value of the ξ and ρv (see Fig.29 b, table 21) (str, app.2) ("the Cables for the gas industry" AS Mesengenic, publishing FAN of the Uzbek SSR, Tashkent, 1972). A sharp decrease in the insulation resistance of the samples with radiation-oxidized isolation is observed with long-term (approximately 420 hours) in water at atmospheric pressure under a voltage of 250 and 500 V alternating current of industrial frequency. The main insulation resistance occurs for the first 80 hours of exposure ("Cables for the gas industry" Assesement, publishing FAN of the Uzbek SSR, Tashkent, 1972, str, app.2).

In areas where the processing of the insulation by electron irradiation, to create an oxygen-free environment to be in excess of 18 m3with a large number of technological gaps requires serious technical solutions and investments (Geplacea "Cables and wires used in the oil and gas industry", str, pril).

The objective of the proposed technical solution is a significant improvement in electro-physical and mechanical characteristics of insulation, including in high-speed lifts cable after a long stay in the hole longer service life of the cable at depths up to 3000 meters with a temperature of the reservoir fluid from 80 to 210° C.

The task to solve due to the fact that the electric cable for power supply of electric submersible pumps contains insulated conductive core and a shell made of thermoplastic elastomer, located on each strand and/or all together, with insulation lived made of baccalaurate-radiation-modified high-density polyethylene through a shell made of thermoplastic elastomer.

The location of the shell of thermoplastic elastomer on each strand and/or all together allows anoxic radiation modification of high density polyethylene, because after coating thermoplastic elastomer insulation conductive wires access of air to the isolation excluded.

This cable design with protected and treated insulation lived creates the condition for obtaining products with a higher quality dielectric properties of the insulation, including the leakage current because it does not affects its dielectric properties from time processed through the shell of other materials continues to reduce its dielectric properties over time.

The set of features of the invention, in addition to the known from the prior art to improve the heat resistance of the cable, leading to a new technical result is detected during operation, a substantial improvement of electro'hara the characteristics of the insulation (see table).

During operation of the proposed cable design discovered a new, previously unknown technical result. Leakage currents baccalaurate-modified through the shell of thermoplastic elastomer cable is ten times less than that of the cable-treated in the air, and several times less than that of the cable baccalaurate-radiation-modified through the shell of other materials, as evidenced by the Protocol.

1 shows a cable with an additional shell located on each strand, and figure 2 - overall sheath located on all leads at once.

Figures 1 and 2 conductive wires 1, the core insulation 2, the sheath of each conductor or sheath lived 3 common sheath of thermoplastic elastomer 4, the cushion of thermally bonded non-woven or epoprostenol technical cloths 5, 6 armor.

The cable is made in the following way: on the conductive wire 1 is the core insulation 2 made of at least two layers of high-density polyethylene, on top of which, or on each strand, or all at once is the shell 4 made of chemically resistant thermoplastic elastomer, for example of Elastollan.

Such design of the cable is protected from access of air insulation lived creates the condition for anoxic radiation modification of high density polyethylene without creating with ecially mechanical devices.

Electric cable for power supply of electric submersible pumps containing insulated conductive core and a shell made of thermoplastic elastomer, located on each strand and/or all together, characterized in that the isolation lived made of baccalaurate-radiation-modified through the shell of thermoplastic elastomeric high density polyethylene.



 

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