During the past few years, gun perforators have been used in petroleum development work for two general purposes: first, to explore possible producing formations which were cased off during the drilling of old wells; and, second, for perforating casing opposite recently drilled, producing formations to produce more efficiently oil or gas from the formations or to eliminate mechanical difficulties. Because the greatest effectiveness of the method depends on making perforations opposite those formations which promise production, obtaining samples from the spent shells seemed to offer a means of determining what perforations had been effective and what perforations had not.
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