Proteins for removing sulfurous compounds and/or acidic compounds in downhole fluids

A method comprising:

• circulating a fluid composition into a subterranean reservoir wellbore;
• wherein the fluid composition comprises:
• brine;
• at least one sulfur-containing compound and/or at least one acid-containing compound;
• at least one protein selected from the group consisting of a labiase, a lysozyme, a cecropin, a thermolysin, and combinations thereof, where the at least one protein is present in a concentration ranging from 0.01 mg/mL to 100 mg/mL based on the total amount of a base fluid within the fluid composition to at least partially lyse the cell walls of bacteria and consequently at least partially remove bacteria from producing sulfur-containing compounds and/or acid-containing compounds;
• and
• a cofactor useful with the at least one protein;
• and
• decreasing an amount of acid-containing compounds and/or sulfur-containing compounds in the subterranean reservoir wellbore and/or downhole fluids recovered therefrom;
• where the fluid composition has a temperature ranging from about 20° C. to about 130° C. and a pH ranging from about 4 to about 11.