A method of preventing overdisplacement and underdisplacement of proppant during well treatments to hydraulically induce and maintain a fracture in a subterranean formation traversed by a wellbore having a perforated casing. In the practice of the method, ball sealers are incorporated in the trailing...http://www.google.fr/patents/US4488599?utm_source=gb-gplus-shareBrevet US4488599 - Method of controlling displacement of propping agent in fracturing treatments
Method of controlling displacement of propping agent in fracturing treatments
