Method for predetermining a polymer for inhibiting hydrate formation
Patent 5900516 Issued on May 4, 1999. Estimated Expiration Date: 
October 10, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 10, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesMethod for controlling clathrate hydrates in fluid systems Method for controlling clathrate hydrates in fluid systems Method for inhibiting hydrate formation Additives and method for controlling clathrate hydrates in fluid systems Patent #: 5639925 InventorsApplicationNo. 948504 filed on 10/10/1997US Classes:585/15, HYDRATE OR PRODUCTION THEREOF137/3, Mixing of plural fluids of diverse characteristics or conditions137/13, Affecting flow by the addition of material or energy166/310, Entraining or incorporating treating material in flowing earth fluid166/371, Including non-expulsive material placed in well208/48AA, Antifoulant additive507/90, PREVENTING CONTAMINANT DEPOSITS IN PETROLEUM OIL CONDUITS585/950Prevention or removal of corrosion or solid depositsExaminersPrimary: Wood, Elizabeth D.Attorney, Agent or FirmInternational ClassesC07C 007/20F17D 001/05 AbstractA method for inhibiting the formation and/or agglomeration of clathrate hydrates in a petroleum fluid stream containing water is disclosed. The disclosed method uses predetermined inhibitors having a guest group, a polymer backbone, and an anchor group positioned between the guest group and the polymer backbone. The inhibitor predetermination method comprises selection of the polymer backbone, anchor group and guest group using several types of criteria. The polymer backbone should produce a substantially water soluble polymer in combination with the anchor group and the guest group. The anchor group should be a hydrophilic moiety with between one and four hydrogen bonding atoms. The guest group should be either a hydrophobic or amphiphilic moiety with a carbon atom to heteroatom ratio greater than or equal to about two to one and an average van der Waals diameter between about 3.8 angstroms and about 8.6 angstroms. Some inhibitors selected using the disclosed predetermination method have produced a subcooling temperature of about 30.0° F. Of 56 predetermined inhibitors, 18 have produced a subcooling temperature ࣙ24.0° F., 22 have produced a subcooling temperature <24.0° F. but ࣙ15.0° F., and 16 have produced a subcooling temperature 10.0° F.Other References
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