Torque-balanced electrical cable

Patent metadata

Field	Value
Publication number	US-9959953-B2
Application number	US-201514628670-A
Country	US
Kind code	B2
Filing date	Feb 23, 2015
Priority date	May 14, 2008
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

An embodiment of a wellbore cable comprises a cable core, at least a first armor wire layer comprising a plurality of strength members and surrounding the cable core, and at least a second armor wire layer comprising a plurality of strength members surrounding the first armor wire layer, the second armor wire layer covering a predetermined percentage of the circumference of the first armor wire layer to prevent torque imbalance in the cable.

First claim

What is claimed is:

1. A wellbore cable, comprising:
a cable core comprising a soft polymer central element disposed between three conductors, wherein the soft polymer central element is deformed completely filling the interstitial space between the conductors; wherein a diameter of a circle passing through the centers of each of the conductors is approximately the same size as the individual diameter of each of the three conductors;
at least a first armor wire layer comprising a plurality of strength members and surrounding the cable core;
at least one layer of a polymeric material surrounding the cable core and the first armor wire layer and defining a predetermined radial thickness; and
at least a second armor wire layer comprising a plurality of strength members surrounding the first armor wire layer and partially disposed within the polymeric material, the polymeric material defining a predetermined radial spacing between the first armor wire layer and the second armor wire layer, the second armor wire layer covering a predetermined percentage of the circumference of the first armor wire layer, wherein the predetermined percentage is from 50 percent to 90 percent, and wherein the number of strength members in the first armor wire layer is equal to the number of strength members in the second armor wire layer.

2. The cable of claim 1 , wherein the strength members of the second armor wire layer comprise at least one stranded armor wire member.

3. The cable of claim 1 , wherein the polymeric material bonds to the first armor wire layer, the second armor wire layer, and the cable core.

4. The cable of claim 1 , wherein the cable core further comprises a polymeric insulating layer and wherein the polymeric material bonds to the insulating layer of the cable core.

5. The cable of claim 1 , further comprising a polymeric jacket forming an outer layer of the cable, the jacket bonded to at least the second armor wire layer.

6. The cable of claim 5 , wherein the polymeric jacket comprises a fiber-reinforced polymer.

Assignees

• Schlumberger Technology Corp

Inventors

• Varkey Joseph
• Chang Sheng
• Protasov Vadim

Classifications

• D07B2201/2044

  comprising polymers · CPC title

• D07B2401/2015

  Killing or avoiding twist · CPC title

• D07B2201/2046

  comprising fillers · CPC title

• H01B7/1855

  Sheaths comprising helical wrapped non-metallic layers · CPC title

• D07B1/162

  characterised by a plastic or rubber enveloping sheathing · CPC title