Patent ID: 6924253
Filing Date: 2005-08-02
Classification: C09K,C23G,Y10S

Abstract:
1. A method for removing scale deposited in a wellbore or in the near wellbore area of a subterranean formation comprising contacting said scale with an effective amount of a fluid comprising an ionic liquid, or mixture of ionic liquids, solvent for said scale, wherein said ionic liquid of the fluid is comprised of cations having the formula in which R 3 , R 4 , and R 5 are selected from H, and saturated and unsaturated hydrocarbon containing from 1 to 22 carbons, respectively, provided that R 3 , R 4 , and R 5 are not simultaneously H, and further provided that the total number of carbon atoms contained by R 3 , R 4 , and R 5 , does not exceed 24.