Removal of hydrogen sulfide from drilling fluids
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United States of America Patent
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Oct 22, 1985
Grant Date -
N/A
app pub date -
Apr 21, 1983
filing date -
Apr 21, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a process for scavenging hydrogen sulfide which frequently becomes entrained in drilling fluid during the course of drilling operations through subterranean formations. The process consists of introducing a solid oxidant in powdered form into the circulating drilling fluid when hydrogen sulfide is encountered. The solid oxidants are selected from the group consisting of calcium hypochlorite (Ca(OCl).sub.2), sodium perborate (NaBO.sub.3), potassium permanganate (KMnO.sub.4), and potassium peroxydisulfate (K.sub.2 S.sub.2 O.sub.8). The solid oxidants are soluble in the drilling fluid, promoting fast and complete scavenging reactions without adversely altering the drilling fluid rheology.
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