Patent ID: 6531427
Filing Date: 2003-03-11
Classification: C09K,Y10S

Abstract:
A method of acidizing an aluminum containing sandstone formation without substantial aluminum fluoride complexes precipitation comprising:contacting said formation with a preflush solution including water and at least one hydroxy carboxylic acid, said hydroxy carboxylic acid being present in said preflush solution in an amount in the range of from 2.1% to about 10% by weight of said preflush solution; and after contacting said formation with said preflush solution, contacting said formation with an acidizing composition including water, hydrofluoric acid and at least one hydroxy carboxylic acid, said hydroxy carboxylic acid being present in said acidizing composition in an amount in the range of from 2.1% to about 10% by weight of said acidizing composition.