By means of a borehole, a fluid such as air or oil is injected into a semi-permeable...http://www.google.es/patents/US4623283?utm_source=gb-gplus-sharePatente US4623283 - Method for controlling water influx into underground cavities B???squeda avanzada de patentes N???mero de publicaci???nUS4623283 ATipo de publicaci???nConcesi???n N???mero de solicitudUS 06/620,297 Fecha de publicaci???n18 Nov 19