Wells – Processes – Distinct – separate injection and producing wells
Patent
1992-10-07
1994-12-27
Neuder, William P.
Wells
Processes
Distinct, separate injection and producing wells
166300, 166307, E21B 4327
Patent
active
053756606
ABSTRACT:
Minerals in a subterranean formation are dissolved by treating them in the presence of an organic acid with a fluoride-containing compound having a concentration in the range of from 0.007 N to 0.05 N. The hydrogen ion concentration can be less than 0.02 N, preferably less than 0.004 N. The fluoride-containing compound can be hydrofluoric acid. Alternatively, the minerals can be treated by applying alternating stages of a solution of fluoride salt, such as ammonium fluoride or ammonium bifluoride, and an organic acid, such as acetic acid. The treatment can be done in a formation at a temperature of at least 350.degree. F.
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patent: 4056146 (1977-11-01), Hall
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patent: 4414118 (1983-11-01), Murphey
patent: 5082058 (1992-01-01), Blumer
H. Perthuis et al., Acid Reactions and Damage Removal in Sandstones: A Model for Selecting the the Acid Formulation, 11, 125-136 (1969).
Society of Petroleum Engineers, Formation Damage Control, 2, 552-553 (1992).
Chevron Research and Technology Company
Neuder William P.
Reid J. S.
Schaal E. A.
Turner W. K.
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