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US 9,802,846 B2Granted
Treating and recylcing oilfield waste water
AssigneeBaker Hughes, A Ge Company, LLC
InventorsKushal Seth, Jenifer C. Lascano, Larry G. Hines
Life of this patent
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Abstract
A process for treating oilfield waste water includes combining oilfield waste water and a biocide comprising hydrogen peroxide, the biocide being present in an amount effective to decrease a number density of bacteria in the oilfield waste water. The treated water can be reused in a subterranean environment.
Claims17
A process for treating oilfield waste water, the process comprising:
- combining oilfield waste water comprising hydrogen sulfide and iron-oxidizing bacteria and a biocide consisting of hydrogen peroxide to form treated water, the biocide being present in an amount effective to decrease a number density of bacteria in the oilfield waste water;
- and
- reusing the treated water by disposing the treated water in a subterranean environment,
- wherein the process further comprises oxidizing an organic material, an inorganic material, or a combination comprising at least one of the foregoing materials with an oxidizer which is a nitrate, a nitrite, a dichromate, or a nitrogen-chloro oxidizer, or a combination comprising at least one of the foregoing, prior to combining the biocide and the oilfield waste water;
- determining an oxidation reduction potential (ORP) of the oilfield waste water;
- and
- adjusting the amount of the biocide present in the oilfield waste water such that the ORP of the oilfield waste water is greater than or equal to 100 mV, referenced to a Ag/AgCl reference electrode.
4 more elements
A process for treating oilfield waste water, the process comprising:
- measuring an oxidation reduction potential (ORP) of oilfield waste water, the oilfield waste water comprising hydrogen sulfide and iron-oxidizing bacteria;
- combining the oilfield waste water and an oxidizer in an amount to adjust the ORP of the oilfield waste water to be greater than or equal to a first ORP value of 100 mV referenced to an Ag/AgCl reference electrode, the oxidizer comprising halogen oxidizer, nitrate, nitrite, dichromate, nitrogen-chloro oxidizer, or a combination comprising at least one of the foregoing;
- and
- adding a biocide comprising hydrogen peroxide to the oilfield waste water having an ORP of greater than or equal to 100 mV to adjust the ORP of the oilfield waste water to be greater than or equal to a second ORP value of 600 mV, referenced to an Ag/AgCl reference electrode, to treat the oilfield waste water, the second ORP value being greater than the first ORP value.
1 more element
A process for recycling oilfield waste water, the process comprising:
- combining oilfield waste water and a biocide consisting of hydrogen peroxide, the oilfield waste water comprising hydrogen sulfide and iron-oxidizing bacteria;
- decreasing a number density of bacteria in the oilfield waste water to form treated water;
- introducing an additive to the treated water;
- and
- disposing the treated water in a subterranean environment,
- wherein the additive comprises a coagulant, a flocculant, or a combination thereof;
- the coagulant comprises sodium chloride, aluminum sulfate, polyaluminum chloride, ferric sulfate, ferric chloride, aluminum chloride, sodium aluminate, polyethyleneimine, dimethylamine-epichlorohydrin copolymer, dicyandiamide-formaldehyde condensation product, cation-modified starch, tannin, a melamine formaldehyde, a resin amine, or a combination comprising at least one of the foregoing;
- and
- the flocculant comprises copolymer of acrylamide and acrylic acid, a copolymer of acrylamide and dimethylaminoethyl acrylate, N,N-dimethylaminoethyl acrylate methyl chloride quaternary, cationic polyacrylamide, acrylic acid, acrylamide meth acrylic acid, polyethylene imine or polyamine, a dicyandiamide condensation polymer, a polymer of water soluble ethylenically unsaturated monomer or monomer blend, or a combination comprising at least one of the foregoing, and
- the process further comprising oxidizing an organic material, an inorganic material, or a combination comprising at least one of the foregoing materials with an oxidizer which is a nitrate, a nitrite, a dichromate, or a nitrogen-chloro oxidizer, or a combination comprising at least one of the foregoing, prior to combining the biocide and the oilfield waste water.
7 more elements
Dependencies are inferred from the claim text.