Method of preventing precipitation of ferrous sulfide and...

Details Method of preventing precipitation of ferrous sulfide and... Method of preventing precipitation of ferrous sulfide and...

E - Fixed Constructions

21

B

31/32

E21B 43/27 (2006.01) C09K 8/532 (2006.01) C09K 8/74 (2006.01)

Patent

CA 1259789

ABSTRACT OF THE DISCLOSURE An improved method of acidizing sour gas wells involv- ing 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 H2S 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 precipitaion of Fe(OH)3, FeS and S in sour wells.

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