RU158833U1 - CABLE CARRYING GEOPHYSICAL - Google Patents

Abstract

A geophysical load-carrying cable containing a conductive core of soft or tinned copper wire, insulated with polyethylene, and two armor coils, characterized in that the armor is made of fibers of ultra-high molecular weight polyethylene.

Description

The utility model relates to cable technology, in particular to load-bearing geophysical cables, and can be used for work and research in low-temperature (not more than 90 ° C) oil, water and gas wells at shallow depths.

Known load-bearing geophysical cable [RU 35036 U1, IPC 7 H01B 7/17, F16L 11/00, publ. December 20, 2003], containing a conductive core, insulation and armor. A load-bearing base made of fiberglass or synthetic fibers, for example, Kevlar or basalt impregnated with an epoxy-polymer binder, is placed between the conductive core and the outer layer of armor made of metal wire.

As a prototype, a commercially available armored geophysical cable [http://www.ntcom-spb.ru/cable/kabelnaja-produkcija/Kabel_odnozhilnyj_grrazonesushhij_bronirovannyj; http://www.etk-perm.ru/catalogue/?product=25&PHPSESSID=eeb6081ffeeb3a86111be24c36471425; http: //www.ntcom and pillows for armor. Cable armor is laid in two coils of high-strength galvanized steel wire.

The disadvantages of the prototype include a large mass of cable, low flexibility and reduced resistance to aggressive environments.

The objective of the utility model is to develop the design of a load-bearing geophysical cable, which has a lower mass, increased flexibility and corrosion resistance.

The proposed load-bearing geophysical cable, as in the prototype, contains a conductive core of soft or tinned copper wire, on which polyethylene insulation is applied, over which armor is laid in two layers.

According to a utility model, the armor is made of ultra-high molecular weight polyethylene fibers.

The proposed geophysical load-bearing cable has a mass less than the prototype (by 67-71%) while maintaining standard sizes (table 1), which, in turn, facilitates its manufacturing technology, transportation and reduces the load on the drain equipment when the cable is placed in the well.

Armor made of ultra-high molecular weight polyethylene fibers has high mechanical strength, comparable to steel (table 2), and also provides high corrosion resistance of the cable to aggressive environments in the conditions of cable operation in oil, water and gas wells, since ultra high molecular weight polyethylene fibers have increased corrosion resistance compared to the prototype, which used steel galvanized wire.

When using fibers of ultra-high molecular weight polyethylene as armor, there is no need to make a substrate (pillow) under the armor, since the insulation material and the armor material are compatible and do not adversely affect each other.

Thus, the proposed geophysical load-bearing cable has sufficient mechanical strength, lower weight, increased flexibility and corrosion resistance, since fibers of ultra-high molecular weight polyethylene have the listed properties [http://fatterovka.ru/company/svmpe-polinit.php, http: / /www.kinetics.nsc.ru/kcp/7ISFS/CD/Papers/OP-23.pdf, http://www.lib.tpu.ru/tulltext/v/Conferences/2012/C2/V2/v2_098.pdf ], in this regard, reliable cable operation with extended service life is ensured. In addition, the cable design and manufacturing technology are simplified, since the load-carrying function is performed by armor made of ultra-high molecular weight polyethylene.

Table 1 presents the results of calculating the mass of cables of a commercially available design for three cable sizes with armor made of galvanized steel wire and the proposed cable.

Table 2 presents for comparison the mechanical characteristics of fibers of ultra-high molecular weight polyethylene, Kevlar and steel.

In FIG. I shows the cross section of the cable geophysical.

Geophysical load-carrying cable contains a conductive core

1 made of copper soft or tinned wire, insulated

2 of polyethylene, on top of which two armor 3, made of ultra-high molecular weight polyethylene fibers, are laid in two layers.

As insulation 2, polyethylene of both low and high pressure can be used.

During operation, the cable is lowered into the well, while the cable provides an electrical connection to the conductive core 1 with the downhole and ground equipment.

Claims (1)

A geophysical load-carrying cable containing a conductive core of soft or tinned copper wire, insulated with polyethylene, and two armor coils, characterized in that the armor is made of fibers of ultra-high molecular weight polyethylene.

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