Composition and method for remediation of near wellbore damage
Aspects of the invention relate to compositions and methods that are used for remediation of near-wellbore damage. A specific aspect is a composition comprising an olefin sulfonate, a sulfosuccinate, and a chemical selected from the group consisting of an alcohol alkoxylated sulfate, an alcohol alkoxylated carboxylate, or a combination thereof.
1. A method for remediation of existing damage in a region near an injection wellbore in communication with a subterranean reservoir wherein the injection wellbore is not intended for receiving hydrocarbons and wherein the existing damage is caused by previous injection of a composition containing a polymer emulsion into the injection wellbore, the method comprising injecting into the subterranean reservoir a composition comprising an emulsion polymer, a C 20 internal olefin sulfonate, a C 15-18 internal olefin sulfonate, and an alcohol alkoxylated carboxylate, thereby dissolving, cleaning and/or flushing the polymer emulsion away from the injection wellbore.
2. The method of claim 1 , wherein the injection of the composition stimulates the region near the injection wellbore in communication with the subterranean reservoir.
3. The method of claim 1 , wherein the injection improves the relative permeability of the region near the injection wellbore in communication with the subterranean reservoir.
4. The method of claim 3 , wherein the relative permeability of the region near the injection wellbore in communication with the subterranean reservoir is increased by at least 250 percent.
5. The method of claim 1 , wherein the temperature of the region near the injection wellbore in communication with the subterranean reservoir is above 55° C.
6. The method of claim 5 , wherein the composition further comprises an alkali.
7. The method of claim 1 , further comprising a co-solvent.