Enzymes for removing sulfurous compounds in downhole fluids
AssigneeBaker Hughes Incorporated
InventorsPrasad D. Dhulipala, Charles D. Armstrong
Life of this patent
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Abstract
Cysteine synthase or O-Acetyl-L-Serine Sulfhydrylase enzymes, such as those derived from the Aeropyrum pernix bacterium, may be used in additive compositions, fluid compositions, and methods for decreasing or removing hydrogen sulfide from recovered downhole fluids and/or the subterranean reservoir wellbore from which the downhole fluid was recovered. The fluid composition may include at least one cysteine synthase enzyme and a base fluid, such as a drilling fluid, a servicing fluid, a production fluid, a completion fluid, an injection fluid, a refinery fluids, and combinations thereof.
Claims5
A method comprising:
- circulating a fluid composition into a subterranean reservoir wellbore;
- wherein the fluid composition comprises at least one cysteine synthase that is at least 75% homologous to the cDNA sequence of SEQ ID NO:1 in an effective concentration to decrease an amount of sulfur-containing compounds;
- and
- decreasing the amount of sulfur-containing compounds in the subterranean reservoir wellbore and/or downhole fluids recovered therefrom.
A method comprising:
- circulating a fluid composition into a subterranean reservoir wellbore;
- wherein the fluid composition comprises at least one cysteine synthase that is at least 75% homologous to the cDNA sequence of SEQ ID NO:1 in an amount ranging from about 1 nanomolar (nM) independently to about 5 millimolar (mm) as compared to the total base fluid;
- and
- decreasing the amount of sulfur-containing compounds in the subterranean reservoir wellbore and/or downhole fluids recovered therefrom.
Dependencies are inferred from the claim text.