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1. (WO2018015222) PROCESS

Pub. No.:    WO/2018/015222    International Application No.:    PCT/EP2017/067441
Publication Date: Fri Jan 26 00:59:59 CET 2018 International Filing Date: Wed Jul 12 01:59:59 CEST 2017
IPC: C09K 8/575
C09K 8/588
C08F 8/00
C11D 1/90
Applicants: BP EXPLORATION OPERATING COMPANY LIMITED
Inventors: CHAPMAN, Emma Jane
O'REILLY, Rachel Kerry
WILLCOCK, Helen
WILLIAMS, Rebecca Jane
Title: PROCESS
Abstract:
The present invention relates to betainised crosslinked polymeric microparticles, a composition comprising the same as a temperature-sensitive dispersion in water and its use in a method of modifying the penneability to water of a thief zone of a subterranean petroleum reservoir. In an aspect, the present invention provides a process for reducing the permeability to water of a thief zone of a porous and permeable subterranean petroleum reservoir, said process comprising: injecting a composition comprising a dispersion of betainised crosslinked polymeric microparticles in an aqueous fluid down a well and into a thief zone, wherein the betainised crosslinked polymeric microparticles have a transition temperature which is at or below the maximum temperature encountered in the thief zone and greater than the maximum temperature encountered in the well, and wherein 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.