WEIGHT DROP SEIS SOURCE TESTS IN WELLS

Institut Francaise du Petrole and other sponsors have developed and field tested a weight drop source for well seismic operations. The source is designated Clubs, for clamped underground borehole source. It is designed for well seismic application and is particularly useful in crosshole seismic surveying. The sponsors used the device in two oil wells in France, performing more than 1,600 shots in 30 hr without failure. The source was lowered in a 7 in. cased, poorly cemented borehole at

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