Electric cable

FIELD: cable engineering; feeding submersible power systems, mainly submersible oil-extraction pump motors.

SUBSTANCE: proposed cable designed for trouble-free operation in depths of up to 3000 m at stratal liquid temperature of 140 to 160 °C and gas factor over 300 m3/t has current-carrying conductors covered with adhesive radiation-modified polyethylene layers, sheath, pad, and armor; common additional sheath is made of thermoplastic material, 0.1 - 1.0 mm thick on flat side and 1.0 - 1.5 mm, on lateral sides; it is disposed over three insulated conductors longitudinally placed in common plane and tightly fitted to one another through their plasma pre-treated insulation.

EFFECT: extended service life of cable.

1 cl, 1 dwg

 

The invention relates to a cable technique and can be used to power the submersible electrical systems, mainly electric motors submersible oil pumps.

On the performance of the cables of the electrical submersible oil pumps is 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, growth ekoworeczki;

- 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, H2S and other, leads to a chemical compound with the molecular structure of the isolation and growth of leakage currents;

high pressure affects the insulation.

Known cable Kitb-120, on THE other 16. C-119-2002 (pril), "power Cables for submersible pumps, heat produced by JSC Kamkabel", where the copper conductive wires, a two-layer insulation silassewell polyethylene cushion of needle-punched non-woven technical fabric and ponpoko of galvanized steel tape.

The disadvantage of the current design is that the conductive veins, according to GOST R 51777 "Cables for submersible pumps", the insulated cores of the cables must be longitudinally sealed when the differential pressure of the well fluid of 0.02 MPa for 5 m length within one and a half hours.

General specifications in the manufacture of submersible cables require that the insulation must be of double-layer and the thickness not less than 2.5 mm PR is applying the first layer silassewell polyethylene, the material passes through the molten state and cooling it happens spatial molecular cross-linking. When applying the second layer to contact the first layer and the second has a different molecular structure and between them there is no adhesion.

In the operation of the cable of this design in wells with a high gas content factor or when working at great depths (>2000 m) between the insulating layers along the cable rises and gas downhole fluid, resulting in swelling of the insulation, reducing the density, the implementation is not dielectric materials in insulation, electrical breakdown and, as a consequence, reduce the service life of the cable (see figure app.2).

The closest technical solution is a cable for power plants electrophrenic pumps KSBP-130, the temperature of 130°on THE other 16 TO 13-012-2002 Podilsky plant NP Podolskkabel containing copper conductive core, combined XLPE (modified polyethylene) and unstitched polyolefin (block copolymers of propylene with ethylene), a pillow of needle-punched nonwovens and ponpoko of galvanized steel tape (pril).

Isolation of two layers made of polyolefins, they change their geometry at a temperature of 80°C and above, which negatively affects the stability of dielectrics the x properties due to the introduction of oily fluids downhole formation. Therefore, this cable cannot be used at temperatures above 130°C.

This cable is available, the adhesion between the layers, as these are two different material on the molecular structure. This leads to longitudinal leaky cable construction and, consequently, to a reduction in service life due to leakage and premature electrical breakdown of the insulation.

The percentage swelling of the insulation at a temperature of -130°is 12-14% (see figure app.2).

The above design does not meet the requirements of GOST R 51777 "Cables for submersible pumps. General technical conditions". The insulated cores of the cables must be longitudinally sealed when the differential pressure of the well fluid of 0.02 MPa for 5 m length within one and a half hours.

The cable of this design is operated in wells at depths of up to 1800-2000 m with a small gas factor.

At greater depths, the design should have a reliable adhesion between the insulating layer and between the upper insulating layer and a shell that protects the insulation.

The objective of the proposed technical solution is the increase of the service life when operating the cable at depths up to 3000 m with a temperature of the reservoir fluid from 140°160°when the gas factor of more than 300 m3/so

The task to solve due to the fact that the electrical cable is contains the conductors, isolated adhered layers of radiation-modified polyethylene, shell, pillow and armor, while the total additional shell made of thermoplastic elastomer with a thickness of 0.7-1.0 mm on the flat side, and on the sides of - 1.0 to 1.5 mm, and is placed on top of three insulated conductors laid in the same plane longitudinally and densely pressed to each other by the insulation, pre-treated plasma.

Perform isolation of each of the conductive wires of the layer of radiation-modified polyethylene, with the same molecular structure, allows to obtain a sufficient degree of adhesion between the insulation layers.

Accommodation chemically resistant shell of thermoelectron on the surface layer of insulation, pre-treated plasma across the surface, leads to the fact that the adhesion between the insulation and termoelektrarna reaches efforts separation from each other (when the width of the strip 2 cm) up to 480 kN, and in the absence of plasma processing surface of the insulation grip is missing completely.

This secure connection between two different molecular structure of the material creates a comfortable environment for insulation of the cable, similar to the work in a dry environment, and allows us to use the cable of the proposed design at depths up to 3000 m with the presence of a high content is of the gas factor nearer to the bottom in the dynamic level of the well fluid.

The shell thickness in the plane of the selected optimal, with a thickness in the range of 0.7-1.0 mm and sufficient to create a solid monolith with wedges and holding them in the right place with regard to compression buenaobra made by winding over a common shell. On the sides of the shell has a sufficient thickness of 1.0-1.5 mm, also saves the main insulation of the maximum pressure buenaobra with the technological operation of the cover shell.

This cable design this layout materials and the alternation of layers leads to a technical result, namely, that increased service life when operating the cable at depths up to 3000 m with a temperature of the reservoir fluid from 140°210°when the gas factor of more than 300 m3/so

Electrical cable shown in the drawing, where copper conductor 1, a two-layer insulation 2 of the radiation modified polyethylene, a common protective sheath of thermoplastic elastomer 3, the cushion of thermally bonded non-woven or needle punched technical fabric 4, the armour of galvanized steel or cupro-Nickel coated tape 5.

Three conductive wires 1 are covered with insulation of two or more layers of polyethylene 2. Layers of insulation 2 are made of the same space is but a modified high density polyethylene, and on top of three, arranged in parallel and pressed tightly to each other and to the surface insulation layer is pre-treated by plasma to enhance the adhesion between materials of different molecular structure, an additional layer of overall sheath 3 made of thermoplastic elastomer, for example, Elastollan, the thickness of the flat sides in the range of 0.7-1.0 mm, and on the sides of 1,0-1,5 mm Cable top protected armour of galvanized steel or cupro-Nickel coated tape 5.

The thickness of thermoplastic elastomer is less than 0.7 mm leads to a weakening of this design, and more than 1.5 mm leads to over-consumption of material.

Electrical cable containing the conductors, insulated adhered layers of radiation-modified polyethylene, shell, pillow and armor, characterized in that the total additional shell made of thermoplastic elastomer with a thickness of 0.7-1.0 mm on the flat side, and on the sides of - 1.0 to 1.5 mm, and is placed on top of three insulated conductors laid in the same plane longitudinally and densely pressed to each other by the insulation, pre-treated plasma.



 

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