14-12-2017 дата публикации
Номер: US20170355896A1
Принадлежит:
Aspects of the invention relate to compositions and methods that are used for the remediation of near-wellbore damage in regions of formations near injection wells in communication with subterranean reservoirs. The damage is caused by previous injection of a polymer emulsion into the injection well. A specific aspect is a method of injecting into the subterranean reservoir a composition containing an olefin sulfonate, a sulfosuccinate, and a chemical selected from an alcohol alkoxylated sulfate, an alcohol alkoxylated carboxylate, or a combination thereof. The polymer emulsion is thereby dissolved, cleaned and/or flushed away from the region near the injection well. 1. A method for remediation of existing damage in a region of a formation near an injection well in communication with a subterranean reservoir wherein the injection well is not intended for receiving hydrocarbons and wherein the existing damage is caused by previous injection of a polymer emulsion into the injection well , the method comprising: injecting into the subterranean reservoir a composition comprising an aqueous solution of an internal olefin sulfonate , wherein the polymer emulsion is thereby dissolved , cleaned and/or flushed away from the region near the injection well.2. The method of claim 1 , wherein the internal olefin sulfonate comprises Cinternal olefin sulfonates claim 1 , Cinternal olefin sulfonates claim 1 , or a combination thereof.3. The method of claim 2 , wherein the Cinternal olefin sulfonate is an isomerized Calpha olefin sulfonate.4. The method of claim 3 , wherein the isomerized Calpha olefin sulfonate comprises about 20-98 percent branching.5. The method of claim 1 , wherein the composition further comprises an alkoxylated alcohol.6. The method of claim 5 , wherein the alkoxylated alcohol comprises an alcohol alkoxylated sulfate.7. The method of claim 6 , wherein the alcohol alkoxylated sulfate is TDA-8(PO)-SO claim 6 , TDA-4(PO)-SO claim 6 , TDA-12(PO)-SO claim 6 , or a ...
Подробнее
