A method of managing lost returns in a wellbore includes contacting a filter cake with a treating fluid to remove metallic weighting agents from the filter cake, wherein the filter cake is disposed on a face of a formation fracture in the wellbore. The method also includes contacting the filter cake...http://www.google.es/patents/US7681644?utm_source=gb-gplus-sharePatente US7681644 - Managing lost returns in a wellbore
