公开(公告)号：US20190276729A1

公开(公告)日：2019-09-12

申请号：US16319327

申请日：2017-07-11

申请人： BP EXPLORATION OPERATING COMPANY LIMITED

发明人： Emma Jane CHAPMAN ,  Rachel Kerry O'REILLY ,  Helen WILLCOCK ,  Rebecca Jane WILLIAMS

IPC分类号： C09K8/575 ,  C09K8/588 ,  C08F20/34 ,  C08F12/28 ,  C08F26/06

摘要： A process for reducing the permeability to water of a thief zone of a porous and permeable subterranean petroleum reservoir includes injecting a composition comprising a dispersion of betainised crosslinked polymeric microparticles in an aqueous fluid down a well and into a thief zone. The betainised crosslinked polymeric microparticles have a transition temperature that is at or below the maximum temperature encountered in the thief zone and greater than the maximum temperature encountered in the well. The betainised crosslinked polymeric microparticles are solvated by water, expand in size and optionally aggregate in the thief zone when they encounter a temperature greater than the transition temperature so as to reduce the permeability of the thief zone to water.