公开(公告)号：US10066149B2

公开(公告)日：2018-09-04

申请号：US15526806

申请日：2015-11-23

申请人： Akzo Nobel Chemicals International B.V.

发明人： Lingling Li ,  James Frederic Gadberry ,  Nick Henry Wolf ,  Jian Zhou

IPC分类号： E21B43/22 ,  C09K8/62 ,  C09K8/60 ,  C09K8/74 ,  C09K8/68 ,  C09K8/42 ,  E21B43/04 ,  E21B43/26

CPC分类号： C09K8/602 ,  C09K8/035 ,  C09K8/42 ,  C09K8/68 ,  C09K8/74 ,  C09K8/86 ,  C09K2208/26 ,  C09K2208/30 ,  E21B43/04 ,  E21B43/26

摘要： Compositions and methods are provided for delayed breaking of viscoelastic surfactant gels inside subterranean formations. Breaking is accomplished without mechanical intervention or use of a second fluid. The delayed breaking agent is selected from alkyl ether phosphates and salts thereof, alkylaryl ether phosphates and salts thereof, alkyl sulfates and salts thereof, alkylaryl sulfates and salts thereof, alkyl ether sulfates and salts thereof, alkylaryl ether sulfates and salts thereof, and mixtures of any of the foregoing. The viscoelastic surfactant can be a zwitterionic surfactant, and can be selected from the group consisting of sultaines, betaines, and amidoamine oxides.