In situ seismic stimulation shows promise for revitalizing mature fields

Field tests in the Elk Hills sandstone in Kern County, Calif., showed that seismic stimulation with a downhole impact tool could increase production.In the test area with two downhole tools installed, production increased from about 1,556 b/d in December 2003 to 2,212 b/d in December 2004. Since then, Occidental Oil & Gas Corp. has installed four more of the Applied Seismic Research Corp. (ASR) Hydro-Impact tools in its Elk Hills field.For several decades interest in elastic-wave stimulation focused primarily on acoustic and to a lesser degree on surface vibroseis stimulation. The third more recent technology is in situ seismic stimulation, which uses the downhole impact tools.1-4Regr...

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