Electrical isolation connector for electromagnetic gap sub

Details Electrical isolation connector for electromagnetic gap sub Electrical isolation connector for electromagnetic gap sub

2011-03-08

2011-03-08

Bochna, David E (Department: 3679)

Pipe joints or couplings

With casing, lining or protector

Insulated

C285S333000

Reexamination Certificate

active

07900968

ABSTRACT:
A gap sub assembly can be used to form an electrical isolation in a drill string, across which a voltage is applied to generate a carrier signal for an electromagnetic (EM) telemetry system. The assembly comprises two conductive generally cylindrical components fashioned with a matching set of male and female rounded coarse threads, held such that a relatively uniform interstitial space is formed in the overlap space between them. The third component is a substantially dielectric electrical isolator component placed into the gap between the threads that effectively electrically isolates the two conductive components. Injecting the dielectric material under high pressure forms a tight bond resistant to the ingress of conductive drilling fluids (liquids, gases or foam), thus forming a high pressure insulating seal.

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