Wells – Processes – Material placed in pores of formation to treat resident...
Patent
1985-02-12
1987-01-06
Suchfield, George A.
Wells
Processes
Material placed in pores of formation to treat resident...
166307, 166310, 166902, 252 8553, 252 8555, E21B 4102, E21B 4327
Patent
active
046339493
ABSTRACT:
An improved method of acidizing sour gas wells involving the injection of an aqueous acidizing solution comprising: water, an acid, an effective amount of an iron complexing agent (e.g., EDTA) capable of stabilizing the ferrous, Fe(II), ion in solution in the presence of H.sub.2 S and an effective amount of an iron reducing agent (e.g., erythorbic acid, ascorbic acid and mixtures thereof) capable of reducing the ferric, Fe(III), ion in solution to ferrous Fe(II), ion at a pH of about 6.0 or less. Such a process is effective in reducing and inhibiting the precipitation of Fe(OH).sub.3, FeS and S in sour wells.
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Dowell Schlumberger Incorporated
Suchfield George A.
White L. Wayne
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