METHOD OF PREVENTING PRECIPITATION OF FERROUS SULFIDE AND SULFUR DURING ACIDIZING

METHOD OF PREVENTING PRECIPITATION OF FERROUS SULFIDE AND SULFUR DURING ACIDIZING

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 H2S and an effective amount...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: CROWE, CURTIS W
Format: Patent
Sprache:eng
Schlagworte:
ADHESIVES
CHEMISTRY
DYES
MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
NATURAL RESINS
PAINTS
POLISHES
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Beschreibung
Zusammenfassung: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 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 precipitation of Fe(OH)3, FeS and S in sour wells.