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US 8,969,726 B2Granted
Torque-balanced electrical cable
AssigneeSchlumberger Technology Corporation
InventorsJoseph Varkey, Sheng Chang, Vadim Protasov
Life of this patent
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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.
Claims16
A wellbore cable, comprising:
- three conductors, each comprising a cable core encased in a polymeric jacket, an inner armor wire layer disposed against the cable core at a lay angle, and a polymeric layer encasing the inner armor wire layer, wherein an additional armor wire layer covers a predetermined percentage of the circumference of the inner armor wire layer, wherein the predetermined percentage and radial spacing are selected to prevent torque imbalance in the cable, wherein the predetermined percentage is from 50 percent to 90 percent, and wherein the additional armor wire layer has strength members with a greater diameter than strength members in the inner armor wire layer;
- and
- a soft polymer central element disposed between the three conductors, wherein the soft polymer central element is deformed completely filling the interstitial space between the conductors, the conductors cabled together helically at a lay angle opposite the lay angles of the respective armor wires in the conductors to prevent torque imbalance in the cable.
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;
- 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 and the radial spacing are selected to prevent torque imbalance in the cable, wherein the predetermined percentage is from 50 percent to 90 percent, and wherein a diameter of the strength members in the second armor wire layer is greater than a diameter of the strength members in the first armor wire layer.
2 more elements
Dependencies are inferred from the claim text.