| abstract |
The present disclosure provides methods for degrading filter cake and filter cake removal, and compositions for removing filter cake from a subterranean borehole. The methods involve contacting the filter cake with a composition containing an unencapsulated peroxygen and a surfactant, and allowing the composition to remain in contact with the filter cake at a temperature above 165° F. for a period of time sufficient to degrade the filter cake. The methods result in acidic conditions, thereby eliminating any need for follow up acid treatments. The composition is stable enough to effectively remove filter cake at temperatures above 165° F. (preferably, up to 250° F. or greater). Through filter cake removal resulting in improved permeability, the method provides for increased flow, production, and/or recovery of oil and gas hydrocarbons from a subterranean formation. |