Insulated drill collar gap sub assembly for a toroidal coupled t

Details Insulated drill collar gap sub assembly for a toroidal coupled t Insulated drill collar gap sub assembly for a toroidal coupled t

1981-03-04

1982-09-07

Birmiel, Howard A.

Communications: electrical

Wellbore telemetering or control

Using a specific transmission medium

367 81, 175 40, 175320, G01V 140

Patent

active

043486720

ABSTRACT:
An insulated drill collar gap sub for a toroidal coupled telemetry system comprising a first annular sub member (100) operable to be connected at one end to a drill collar and a second annular sub member (104) operable to be connected at the other end to the drill collar. The first and second annular sub members have longitudinally extending interconnecting structural members (106, 118) operable to structurally interfere. The interconnecting structural members are dimensioned to form a continuous gap (116) between mutually opposing surfaces and a dielectric material (118) fills the gap to electrically isolate the first annular sub member (100) from the second annular sub member (108). A bearing member (124) is positioned between the first annular member and the second annular member but is insulated from at least one of said annular members to facilitate the formation of a drill collar of structural and electrical integrity.

REFERENCES:
patent: 2400170 (1946-05-01), Silverman
patent: 2414719 (1947-01-01), Cloud
patent: 3090031 (1963-05-01), Lord
patent: 3274798 (1966-09-01), Wiggins
patent: 3323327 (1967-06-01), Leathers et al.
patent: 3926265 (1975-12-01), Bouyoucos
patent: 4066995 (1978-01-01), Matthews

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