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Hydraulic impulse generator and frequency sweep mechanism for borehole applications

United States Patent

November 21, 2006
View the Complete Patent at the US Patent & Trademark Office
This invention discloses a valve that generates a hydraulic negative pressure pulse and a frequency modulator for the creation of a powerful, broadband swept impulse seismic signal at the drill bit during drilling operations. The signal can be received at monitoring points on the surface or underground locations using geophones. The time required for the seismic signal to travel from the source to the receiver directly and via reflections is used to calculate seismic velocity and other formation properties near the source and between the source and receiver. This information can be used for vertical seismic profiling of formations drilled, to check the location of the bit, or to detect the presence of abnormal pore pressure ahead of the bit. The hydraulic negative pressure pulse can also be used to enhance drilling and production of wells.
Kolle; Jack J. (Seattle, WA), Marvin; Mark H. (Tacoma, WA), Theimer; Kenneth J. (Auburn, WA)
Tempress Technologies, Inc. (Kent, WA)
10/ 777,484
February 12, 2004
GOVERNMENT RIGHTS This invention was made with U.S. Government support under Contract Nos. DE-FC26-97FT34367 and DE-FG03-00ER83111 awarded by the Department of Energy, and the government may have certain rights in this invention.