An assembly for use in subsurface drilling includes a downhole probe having an EM telemetry signal generator and electrical contacts for carrying telemetry signals from the EM telemetry signal generator to first and second parts of a gap sub in a drill string. An outside surface of the probe and an inside surface of the gap sub are covered with layers of electrically-insulating material. Electrical conduction paths internal to the gap sub are removed, thereby increasing efficiency of EM telemetry.
申请公布号
CA2890603(A1)
申请公布日期
2014.05.15
申请号
CA20132890603
申请日期
2013.11.06
申请人
EVOLUTION ENGINEERING INC.
发明人
DERKACZ, PATRICK R.;LIU, JILI (JERRY);LOGAN, AARON W.;LOGAN, JUSTIN C.;SWITZER, DAVID A.;KAZEMI, MOJTABA