Brine fluids having improved rheological charactersitics
Patent 5728652 Issued on March 17, 1998. Estimated Expiration Date: 
August 25, 2015. 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.
August 25, 2015. 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 ReferencesDispersible hydrophilic polymer compositions Saturated brine well treating fluids and additives therefore Polysaccharide containing fluids having enhanced thermal stability Low solids, high density fluids for well drilling Patent #: 5616541 InventorsApplicationNo. 512675 filed on 08/25/1995US Classes:507/145, Inorganic component is soluble in boring medium507/110, 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 carbons507/209, 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 carbons507/271, Inorganic component contains Ti, Zr, V, Cr, Mn, Fe, or Ni507/925COMPLETION OR WORKOVER FLUIDExaminersPrimary: Gibson, SharonAssistant: Fee, Valerie Attorney, Agent or FirmInternational ClassC09K 007/00AbstractThe invention provides brine based well drilling and servicing fluids which exhibit relatively thermally stable rheological and filtration characteristics. The fluids comprise a brine, an amorphous silica viscosifier, a biopolymer viscosifier, a fluid loss control additive, and a bridging agent. By utilizing both a silica viscosifier and a biopolymer viscosifier to provide the desired rheological characteristics, the fluids have enhanced thermal stability thus maintaining their suspension and hole cleaning properties over an extended temperature range.Field of SearchCarbohydrate is polysaccharidePolysaccharide is starch or derivative thereof Polysaccharide is a xanthan (e.g., scleroglucans, etc.) 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 carbons Carbohydrate is starch or derivative thereof 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 Inorganic component is soluble in boring medium Inorganic component contains Ti, Zr, V, Cr, Mn, Fe, or Ni COMPLETION OR WORKOVER FLUID |
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