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US 11,767,457 B2Granted
Monovalent brine-based reservoir drilling fluid
AssigneeSchlumberger Technology Corporation
InventorsClotaire-Marie Eyaa Allogo, Raymond Ravitz, Sooi Kim Lim
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Abstract
Wellbore fluids may contain an aqueous base fluid comprising a monovalent brine, a modified starch, and a metal oxide. Methods of using wellbore fluids may include drilling a subterranean well while circulating a wellbore fluid into the subterranean well, wherein the wellbore fluid contains an aqueous base fluid comprising a monovalent brine, a modified starch, and a metal oxide.
Claims8
A wellbore fluid, comprising:
- an aqueous base fluid comprising a monovalent brine;
- a modified starch;
- and
- a mixture of divalent metal oxides, wherein the mixture of divalent metal oxides is present at a concentration ranging from 2 ppb to 5 ppb, and wherein the wellbore fluid has no more than 3 wt % of alkaline earth metal in the wellbore fluid.
1 more element
Dependencies are inferred from the claim text.