초록 ▼

A process for restoring the injectivity or productivity of a well penetrating a subterranean formation by injecting a micelle treating fluid into the subterranean formation via the well with the micelle treating fluid containing a 2% potassium chloride water solution and a mutual solvent containing

A process for restoring the injectivity or productivity of a well penetrating a subterranean formation by injecting a micelle treating fluid into the subterranean formation via the well with the micelle treating fluid containing a 2% potassium chloride water solution and a mutual solvent containing alcohol, aromatic hydrocarbon and an alkyl or alkylaryl polyoxyalkylene phosphate ester surfactant, thereafter displacing the micelle treating fluid into the formation by injecting a gas into the well and contacting accumulated asphaltene precipitate and a low-gravity, high-viscosity, asphaltene-based crude in the subterranean formation with the micelle treating fluid to disperse the accumulation of asphaltene and to reduce the viscosity of the low-gravity, high-viscosity, asphaltene-based crude.

대표청구항 ▼

[ I claim:] [1.]1. A process for restoring the injectivity or productivity of a well penetrating a subterranean formation and defining a well bore and a well bore face, the injectivity or productivity of the well being reduced by an accumulation of an asphaltene precipitate on the well bore face or

[ I claim:] [1.]1. A process for restoring the injectivity or productivity of a well penetrating a subterranean formation and defining a well bore and a well bore face, the injectivity or productivity of the well being reduced by an accumulation of an asphaltene precipitate on the well bore face or in the subterranean formation the process comprising:a) injecting a micelle treating fluid into the well penetrating the subterranean formation, the micelle treating fluid comprising a 2 percent potassium chloride water solution and a mutual solvent comprising alcohol, aromatic hydrocarbon, and an alkyl or alkylaryl polyoxyalkylene phosphate ester surfactant, the 2 percent potassium chloride water solution and the mutual solvent being mixed in a volumetric ratio of about 1 to 1 to about 2 to 1,b) displacing the micelle treating fluid into contact with the accumulation of asphaltene precipitate and the low-gravity, high-viscosity, asphaltene-based crude in the formation by injecting a gas into the well; and,c) contacting the accumulation of asphaltene precipitate and the low-gravity, high-viscosity, asphaltene-based crude indigenous to the formation with the micelle treating fluid so that the micelle treating fluid degrades and disperses the accumulation of asphaltene precipitate to substantially restore infectivity or productivity of the well and reduces the viscosity of low-gravity, high-viscosity, asphaltene-based crude.