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Method and Apparatus for Testing Electromagnetic Connectivity in a Drill String

United States Patent Application

20050212530
A1
View the Complete Application at the US Patent & Trademark Office
A method and apparatus for testing electromagnetic connectivity in a drill string are disclosed. The method includes transmitting a test signal down a transmission path in a drill string; receiving a reflection of the test signal; and determining from the reflection whether there is an interruption in the electromagnetic connectivity in the transmission path. In general, the apparatus includes a signal generator for generating a test signal into the drill string; a receiver for receiving the reflection of the test signal; and means for determining from the reflection whether there is an interruption in the electromagnetic connectivity in the transmission path. Preferably, a common coil is included through which the test signal generated by the signal generator may be transmitted into a drill string and through which a reflection of the test signal may be received.
Hall, David R. (Provo, UT), Hall, H. Tracy JR. (Provo, UT), Pixton, David S. (Lehi, UT), Rawle, Michael (Springville, UT), Bartholomew, David B. (Springville, UT), Soares, Marshall A. (Taylorsville, UT)
10/ 708,775
March 24, 2004
[0001] This invention was made with government support under Contract No. DE-FC26-97FT343656 awarded by the U.S. Department of Energy. The government has certain rights in the invention.