Patent ID: 8802601

Claim:
A method of treating a siliceous formation penetrated by a wellbore, the method comprising: forming a treatment fluid comprising an aqueous fluid containing a hydrogen fluoride source and an amorphous silica precipitation inhibitor, wherein the amorphous silica precipitation inhibitor is selected from the group consisting of: copolymers and homopolymers of acrylic acid and/or maleic acid or salts or derivatives thereof; organosilanes, amines of an organosilane or esters of an organosilane,; organosilicons having a structure represented by the formula Si(OR) 3 (R′NH 2 ), where R and R′ are each organic groups that are the same or different, phosphonate compounds having a structure represented by the formula: wherein R 1 R 2 and R 3 is each independently hydrogen, alkyl, aryl, phosphonate, phosphate, acyl, amine, hydroxyl or carboxyl group, and wherein R 4 and R 5 is each independently hydrogen, sodium, potassium, ammonium or an organic radical, and combinations of these; and introducing the treatment fluid into the siliceous formation through the wellbore at a pressure below the fracture pressure of the siliceous formation to facilitate dissolution of formation materials, the amorphous silica inhibitor being capable of inhibiting precipitation of amorphous silica so that the treatment fluid contains at least about 500 ppm of silicon in solution after at least about 100 minutes subsequent to the treatment fluid being introduced into the siliceous formation.