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US 9,006,216 B2Granted
Biocidal aldehyde composition for oil and gas extraction
OwnerHoward Martininventor
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OwnerHoward Martininventor
Estimating the term…
A combination biocide (Glutaraldehyde or OPA), quaternary phosphonium biocide (preferably TTPC), alcohol (preferably isopropyl alcohol), and functional excipients for the oil and gas recovery industry. The functional excipients for the oil and gas recovery industry are a cellulose type proppant, a poloxamer wetting agent, a friction-reducing pluronic block copolymer, a drag reducing agent such as polyethylene oxide, and a flocculating agent. The OPA may be of the dialdehyde C6H4(CHO)2 form, and the Glutaraldehyde of formula C5H8O2. Both will produce an inherent bacteriostatic effect and lower surface tension and thus aids in the spread of the TTPC on the biofilm covered surface where it is readily absorbed by the negative surfaces of proteins and bacteria. It thus serves as a binding agent between the TTPC and the application surface. The foregoing constituents are combined in preferred concentrations within acceptable ranges to provide a synergistic biological chemical complementarity system.
A biocidal formulation for aqueous addition to fracturing water during secondary oil and gas recovery from a well, comprising orthophthalaldehyde within a range of from 0.25-7% by weight, plus tributyl tetradecyl phosphonium chloride (TTPC) within a range of from 0.24-6% by weight, approximately equal amounts of said orthophthalaldehyde and TTPC, and excipient constituents including triethanol amine, glycol ether, sulfonic acid and water, all mixed in an isopropyl alcohol solution having a pH within a range of from 3 to 9, wherein said biocidal formulation is diluted to within a range of from 50 ppm to 1000 ppm prior to aqueous addition to said fracturing water.
A biocidal formulation for aqueous addition to fracturing water during secondary oil and gas recovery from a well, consisting of orthophthalaldehyde within a range of from 0.25-7% by weight, tributyl tetradecyl phosphonium chloride (TTPC) within a range of from 0.24-6% by weight, approximately equal amounts of said orthophthalaldehyde and TTPC, a cellulosic proppant selected from the group consisting of methylcellulose, ethylcellulose and hydroxyethylcellulose within a range of from 0.2-0.5% by weight, monomer block copolymer, a triblock non-ionic copolymer, iso-propyl alcohol, and water wherein said biocidal formulation is diluted to within a range of from 50 ppm to 1000 ppm prior to aqueous addition to said fracturing water.
Dependencies are inferred from the claim text.