Wellbore electrical isolation system

摘要

This disclosure relates to a wellbore electrical isolation system and method. The system may comprise an electrically conductive tube, an insulating layer covering at least a portion of the tube, an electrically conductive centralizer, electrically insulating confinement devices, and/or other components. In some implementations, the system may be configured to electrically isolate one or more sections of an electrically conductive well tubing string from an electrically conductive wellbore casing. In some implementations, a well may include one or more wellbore electrical isolation systems. Electrical isolation of the tubing string from the casing may facilitate powering one or more electrical loads disposed within the wellbore via a coaxial transmission line formed by the casing and the tubing string.

主权项

1. A wellbore electrical isolation system, the system comprising:
an electrically conductive tube having a first end and a second end, wherein at least a portion of an outside diameter of the tube between the first end and the second end is covered with an electrically insulating layer; and an electrically conductive centralizer, the centralizer being coupled to the insulating layer such that the centralizer and the tube are electrically insulated from each other, wherein movement of the centralizer longitudinally along the tube is confined by a first electrically insulating confinement device toward the first end of the tube and a second electrically insulating confinement device toward the second end of the tube, wherein the centralizer is configured to engage a conductive wellbore casing to maintain a physical separation between the tube and the casing, and wherein the electrical insulation between the centralizer and the tube isolates the tube electrically from the casing.