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Method for enhancing low frequency output of impulsive type seismic energy sources and its application to a seismic energy source for use while drilling

United States Patent

December 2, 2014
View the Complete Patent at the US Patent & Trademark Office
A method for operating an impulsive type seismic energy source in a firing sequence having at least two actuations for each seismic impulse to be generated by the source. The actuations have a time delay between them related to a selected energy frequency peak of the source output. One example of the method is used for generating seismic signals in a wellbore and includes discharging electric current through a spark gap disposed in the wellbore in at least one firing sequence. The sequence includes at least two actuations of the spark gap separated by an amount of time selected to cause acoustic energy resulting from the actuations to have peak amplitude at a selected frequency.
Radtke; Robert P. (Kingwood, TX), Stokes; Robert H. (Austin, TX), Glowka; David A. (Red Rock, TX)
Technology International, Inc. (Kingwood, TX)
12/ 337,406
December 17, 2008
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made pursuant to contract number DE-FC26-04NT42242 with the United States Department of Energy. The Government retains certain rights in the invention.