Polysaccharide-containing well drilling and servicing fluids
Patent 5916849 Issued on June 29, 1999. Estimated Expiration Date: 
July 24, 2018. 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.
July 24, 2018. 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 References 2713029 Aqueous polysaccharide compositions Polysaccharide containing fluids having enhanced thermal stability Patent #: 5514644 InventorAssigneeApplicationNo. 121712 filed on 07/24/1998US Classes:507/110, Organic component is carbohydrate or derivative thereof (e.g., sugar or gum, such as galactomannan, xanthan, etc.) or carboxylic acid ester of an alcohol which has five or more hydroxy groups bonded directly to carbons507/140, Contains inorganic component other than water or clay507/209, Organic component is carbohydrate or derivative thereof (e.g., sugar or gum, such as galactomannan, etc.) or carboxylic acid ester of an alcohol which has five or more hydroxy groups bonded directly to carbons507/213, Polysaccharide is a xanthan (e.g., scleroglucans, etc.)507/269Contains inorganic component other than water or clayExaminersPrimary: Tucker, PhilipAttorney, Agent or FirmInternational ClassC09K 007/02AbstractDisclosed is a method of increasing the thermal stability or decreasing the fluid loss of aqueous polysaccharide-containing fluids which comprises incorporating into the fluids an oligosaccharide mixture composed of arabinose, mannose, galactose, glucose, and xylose sugar units, the oligosaccharide mixture consisting of the water soluble portion of thermally hydrolyzed lignocellulose and consisting primarily of pentosans and hexosans containing from one to four combined sugar units.Preferred fluids contain a biopolymer which increases the low shear rate viscosity of the fluids. Fluids which contain polysaccharides which impart other desirable characteristics to the fluids, such as increased viscosity at higher shear rates, fluid loss control, and the like, also exhibit increased thermal stability upon incorporating the oligosaccharide mixture therein.Field of SearchOrganic component is carbohydrate or derivative thereof (e.g., sugar or gum, such as galactomannan, xanthan, etc.) or carboxylic acid ester of an alcohol which has five or more hydroxy groups bonded directly to carbonsCarbohydrate is cellulose or derivative thereof Contains inorganic component other than water or clay Organic component is carbohydrate or derivative thereof (e.g., sugar or gum, such as galactomannan, etc.) or carboxylic acid ester of an alcohol which has five or more hydroxy groups bonded directly to carbons Polysaccharide is a xanthan (e.g., scleroglucans, etc.) Contains inorganic component other than water or clay |
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