Aqueous polysaccharide compositions
AssigneeShell Oil Company
InventorsAnthony J. Clarke-Sturman, Phillip L. Sturla
Life of this patent
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Abstract
The invention provides aqueous polysaccharide compositions comprising 0.03 to 5% w/v of a water-soluble polysaccharide, 5 to 80% w/v of at least one salt of at least one mono- or divalent cation, wherein at least 0.05% w/v, based on the composition, of the at least one salt is formate, the balance of the at least one salt, if any, being at least one halide, a process for preparing the compositions, and their use in well-drilling operations.
Claims11
An aqueous polysaccharide composition comprising 0.03 to 5% w/v of a water-soluble microbial polysaccharide selected from Succinoglycan or Xanthan polysaccharides, 5 to 120% w/v of at least one sodium or potassium salt, wherein at least 0.05% w/v, based on the composition, of said sodium or potassium salt is formate, the balance of said sodium or potassium salt, if any, being at least one halide.
Dependencies are inferred from the claim text.