Method of making universal cable

 

It is used for manufacturing universal electric cables for oil production used as feed, heating at downhole equipment, etc. and load-carrying cables. Solves the problem of increasing the resistance of the cable to tension, crushing and impact loads in the manufacturing process, jump, lifting operations and maintenance. Reduces labor and material costs. Is holding tripping operation at low temperatures. The insulating coating on the conductors (TJ) impose by extrusion simultaneously on two parallel and at a fixed distance from one another TJ to form between them a rigid jumpers of insulating material in one pass, and the formation of multi-core universal cable is carried out in the process of applying for isolated TJ pillows under armour and belt armor by placing between two isolated simultaneously TJ isolated individually TJ. When this jumper is placed TJ isolated from a material with different specific resistances, and different sections. Profile jumpers of insulating material may be flat, wipmania. 4 C.p. f-crystals, 2 Il.

The invention relates to technology universal (multipurpose) electric cables for oil production that are used in conjunction with the equipment of oil and water wells to supply electric motors of submersible pumps, the limit of heating up of high-viscosity oil and gas mixture in the well, to prevent and eliminate parfenovitch tubes in the well, to the limit of heating up of pipelines, as well as the load-bearing cable.

A known method of manufacturing a universal cable, including the manufacture of the conductors, overlaying the conductive core by extrusion sequentially first, then the second heat-resistant insulation membranes, testing of semi-finished product and the subsequent formation of the insulated conductive wires of the multiwire cable by imposing on isolated veins protective winding pillows under armor - with a simultaneous imposition on her belt profiled reservation, or by imposing on the insulated cores total hose shell pillows under armor - with the subsequent imposition on her belt profiled, and Lastochkin to the claimed technical nature.

The disadvantages of this method are: - poor performance, because of the imposition of a two-layer shell (to provide the required insulating properties) requires each mine twice to pass through the extruder; - requires considerable labor and material costs in the process of isolating conductive wires and the formation of these cables, and when booking, because for each of the conductors must be individual drum and respectively terminating device.

In addition, the cable is manufactured in a known manner, is not a high electrical and mechanical characteristics, namely: - insufficient high resistance isolation medium veins crush lateral veins, which is expressed at elevated temperatures during operation of the cable when the average veins can be crushed lateral veins; - lack of firmness construction of the cable to tensile and impact loads in the process of winding and operation of the cable in the borehole conditions: during operation of the cable occurs hood cable on 7-15%, which leads to the violation (escape) insulating membrane with veins, as well as the divergence of orbits armor and, as a consequence of the violation of this temperature and below, in the process of rewinding and tripping operation occurs cracking of the insulation shells.

These drawbacks made known method of cable reduce its operational reliability, resulting in the cable goes down and to the further exploitation unsuitable.

The technical task to be solved by the invention is to improve the operational reliability of the manufactured universal cable, in particular, improved resistance to stretching, squashing and shock loads in the manufacturing process, jump, lifting operations and maintenance.

Also solves the problem of reducing labor and material costs in the manufacture of the universal cable.

Additionally solved the technical problem - providing for a tripping operation at low temperatures by providing samoprogreva cable.

The goal of the project is achieved in that in the known method of manufacturing a universal cable which includes applying to the conductive core by extrusion of at least one insulating sheath, the formation of the insulated conductive wires stranded to the her armor or overlay on the insulated conductive wires total protective hose sheath with the subsequent imposition on her armor, what's new is that the insulating sheath is applied extrusion simultaneously on two parallel and at a fixed distance from each other, the conductors to form between them a rigid jumpers of insulating material, and insulating sheaths for the two conductive wires with a rigid bridge between them impose by extrusion in a single pass, the formation of multi-core universal cable in the overlay process on isolated veins or protective winding or overlay hose winding and booking on the bridge between the two insulated conductors are placed insulated conductive wires individually insulated, and the shape of the cable is attached in the booking process.

On the bridge between two isolated at the same time the electric conductors accommodated isolated strands of conductive material with different resistivity and different cross-sections.

Profile jumpers of insulating material between two conductors when the extrusion perform flat, convex, concave.

The jumper between the cores in the process of isolating perform the specified width, height and shape.

The shape of the cable in procession shell impose extrusion simultaneously on two parallel and at a fixed distance from each other, the conductors to form between them a rigid jumpers from the same insulating material, moreover, the imposition of isolation on two cores are produced in a single pass, is provided by: - improving the performance of cable manufacturing; - reducing the number of reels and pay offs devices during manufacturing and rewinding of the material; - creating rigid structures of the semi-finished product (finished product) due to the formed rigid bridges between isolated veins.

The operation of isolating conductive wires offered by way allows you to tuck the average cable conductor individually insulated in a fixed interval on a rigid jumper, thus eliminating the negative effects of stretching, squashing and shock loads on the cable core. Such rigid lateral insulated conductors will help protect against crushing and mechanical damage secondary veins that are located in more severe conditions as in the manufacturing process of the cable, and in the process of exploitation.

The implementation of hard jumpers of different profiles - flat, convex, or concave, and the specified width, height, and shape - allows you to use universal cable for heating various surfaces and therefore extend the functionality of such a cable.

Blogvideo material with different resistivity and different cross-section, have the opportunity to place between the main veins auxiliary leads with high resistivity and a smaller cross-section, which can function as an additional source of heat capacity and use the extra cores for samoprogreva cable directly in the field, which allows runs of cable at low temperatures (below 18oC) without insulation.

In Fig.1 and 2 variants of multi-conductor cable manufactured according to the proposed method.

The process of manufacture of stranded universal cable includes the following operations: manufacture of conductive wires; overlaying the insulation on the wires; the test material; forming a multi-conductor cable by placing between the side isolated veins medium insulated conductors conducting simultaneous operations overlay on the conductor insulation of the winding (pillows under armor) with a simultaneous imposition of the reservation, or overlay total hose casings (pillows under armor) with a subsequent booking.

The manufacture of the conductors 1, for example copper, carried out by the conventional methods.

Insulating shell 2 on meneralnye in parallel and spaced at a fixed distance from each other of copper wires 1. The design of the extrusion head allows you to get the desired profile of the blend polymer material, in which between the two insulated conductors are immediately formed a rigid crosspiece 3 of the same insulating material. Moreover, the imposition of insulation on the two wires carry out in a single pass. Profile jumper 3 of insulating material between two conductors 1 at extrusion may be flat (Fig.1), convex, or concave (Fig. 2) depending on the surface profile of the heating and destination of the cable. The jumper between the cores 3 in the process of isolating perform the specified width, height and form that is provided by the corresponding profile of the holes in the matrix of the extrusion head. The width of the jumper 3 between the lateral veins 1 is sufficient to accommodate up to it the required number of secondary conductive insulated conductors 1. As thermoplastic insulation can be used the following materials: polyethylene, block copolymers of propylene, polytetrafluoroethylene or other material whose parameters match the operating temperature of the cable.

When forming, for example, a three-core cable overlaying the insulating sheath can be accomplished according to scheme 2+1 od the individual insulating sheath on the middle vein.

Then of insulated conductive wires 1 stranded form, such as three-core cable. For this purpose, the armored vehicle with leptobrachium make the semi-finished product of two simultaneously insulated copper conductors 1. Simultaneously with the process of applying copper insulated wires 1 protective winding 4 (pillows under armor) and simultaneous with this armour plating 5 of the profiled galvanized strip for jumper 3 between isolated side copper conductors 1 start with giving the device and placed her middle individually isolated copper core 1. The bridge 3 can be stacked with additional conductive individually isolated veins 6 of conductive material with high resistivity and a smaller cross-section, for example, steel. Additional conductive steel wires 6 are placed between the main (copper) conductors 1, filling the void between them.

In the process of booking a cable is passed through the forming the profile of the rollers, causing the cable to give the desired shape.

Thus, the proposed method of manufacture of the cable allows you to produce a universal cable, power electrical (copper core), and the e cores allows then to ensure operational reliability - to increase the resistance of the cable, for use in corrosive environments and harsh downhole conditions to stretching, crushing, shock loads. And laying in the gaps between the main veins additional steel lived further enhances the mechanical strength of the cable, eliminating distortion both in the transverse and in longitudinal section. In addition, manufactured declared by way of the cable can be rewound and carry out lifting operations, use, and at low temperatures (below 18oC).

The proposed method allows to reduce material and labor costs - fewer drums and radiating devices in the manufacture of the cable. Added the possibility to reduce the intensity and weight of the cable is not less than 1.7 times as overlapping turns of tape armor for the working conditions in the borehole due to the rigid structures of isolated lateral veins is reduced to 20-25% (instead of 45-50% for cables manufactured according to THE 16505 129-82). Besides increasing the productivity in the manufacture of the cable, because the imposition of isolation is at the same time on two cores.

Claims

1. A method of manufacturing a universal cable that includes nalog polirovannyj conductive wires of the multiwire cable by imposing on isolated conductive protective conductor winding with a simultaneous imposition on her armor or overlay on the insulated conductive wires total protective hose sheath with the subsequent imposition on her armor, wherein the insulating sheath is applied extrusion simultaneously on two parallel and at a fixed distance from one another conductive wires to form between them a rigid jumpers of insulating material, and insulating sheaths for the two conductive wires with a rigid bridge between them impose by extrusion in a single pass, the formation of multi-core universal cable in the overlay process on isolated veins or protective winding or overlay total hose sheath and booking on the bridge between the two insulated conductors simultaneously place the insulated conductive wires with individual isolation and the shape of the cable is attached in the booking process.

2. Method of making universal cable under item 1, characterized in that the jumper between the two isolated at the same time the electric conductors accommodated isolated strands of conductive material with different specific resistances, and different sections.

3. Method of making universal cable under item 1, characterized in that the profile of the jumpers of insulating material between two conductors when extrud the tives such as those that the jumper between the cores in the process of isolating perform the specified width, height and shape.

5. Method of making universal cable under item 1, characterized in that the shape of the cable in the booking process attached by passing it through a forming profile rollers.

 

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