Peracetic Acid Oil-Field Biocide and Method
AssigneeFMC Corporation
InventorsJohn M. Rovison, JR., Shurong Huang, Henry A. Pfeffer
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Abstract
Aqueous well treatment fluid compositions with biocidal activity are disclosed comprising a polymer for modifying fluid viscosity in the aqueous fluid, an organic monocarboxylic peracid being present in an anti-microbial amount of about 1 ppm to about 1000 ppm, and a controlled amount of hydrogen peroxide also being present. Peracetic acid is the preferred peracid. The viscosity-modifying polymer in the aqueous well treatment fluid composition may serve to reduce friction in the fluid or increase fluid viscosity. A method of using such compositions is also disclosed.
Claims26
An aqueous well treatment fluid composition with biocidal activity comprising
- a polymer or copolymer for modifying fluid viscosity;
- an organic monocarboxylic peracid in an antimicrobial amount of about 1 ppm to about 1000 ppm;
- and
- hydrogen peroxide, the hydrogen peroxide concentration being less than the peracid concentration;
- in an aqueous medium.
An aqueous well treatment fluid composition with biocidal activity comprising
- a fluid viscosity-reducing polymer or copolymer in a friction-reducing amount to provide improved fluid flow characteristics;
- peracetic acid in an antimicrobial amount of about 1 ppm to about 1000 ppm;
- and
- hydrogen peroxide, the hydrogen peroxide concentration being less than the peracetic acid concentration;
- in an aqueous medium.
An aqueous well treatment fluid composition with biocidal activity comprising
- a viscosity-increasing polymer or copolymer in an amount sufficient to increase fluid viscosity;
- peracetic acid in an antimicrobial amount of about 1 ppm to about 1000 ppm;
- and
- hydrogen peroxide, the hydrogen peroxide concentration being less than the peracetic acid concentration;
- in an aqueous medium.
A method of providing biocidal activity in a well treatment fluid comprising introducing, into an aqueous well treatment fluid composition comprising
- a polymer or copolymer for modifying fluid viscosity, and an aqueous monocarboxylic peracid solution in an antimicrobial-effective amount of about 1 ppm to about 1000 ppm, the aqueous peracid solution having a peracid acid weight concentration in excess of hydrogen peroxide also present in the aqueous peracid solution;
- and thereafter
- directing the aqueous well treatment fluid into a subterranean environment.
Dependencies are inferred from the claim text.