Insulated drill collar gap sub assembly for a toroidal...

Details Insulated drill collar gap sub assembly for a toroidal... Insulated drill collar gap sub assembly for a toroidal...

E - Fixed Constructions

21

B

255/1

E21B 17/16 (2006.01) E21B 17/00 (2006.01) E21B 47/12 (2006.01) F16L 15/04 (2006.01) F16L 25/02 (2006.01) F16L 37/244 (2006.01)

Patent

CA 1175412

Abstract An insulated drill collar gap sub assembly for a toroidal coupled telemetry system including a first annular sub member (l50) operable to be connected at one end to a drill collar and a second annular sub member (156) operable to form a part of a drill collar sub. The first and second annular sub members have interconnecting structural members (54, 58) operable to structurally interfere. The interconnecting strucutually members are dimensioned to form a continuous gap (160) between mutually opposing surfaces and a dielectric material (162) fills the gap to electrically isolate the first annular sub members with respect to the second annular sub member. A bearing member (l64) is positioned between the first annular member and the second annular member and is coated with a dielectric insulation (166) to facilitate the formation of a drill collar gap sub assembly of structural and electrical inteqrity.

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