Back to results
US 12,227,690 B2Granted
Monovalent brine-based reservoir drilling fluid
AssigneeSchlumberger Technology Corporation
InventorsClotaire-Marie Eyaa Allogo, Raymond Ravitz, Sooi Kim Lim
Life of this patent
Estimating the term…
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.
Claims9
A method of drilling a subterranean well, the method comprising:
- drilling the subterranean well while circulating a wellbore fluid in the subterranean well, wherein the wellbore fluid comprises:
- an aqueous base fluid comprising a monovalent brine;
- a modified starch;
- and
- a mixture of divalent metal oxides present at a concentration ranging from 2 pounds per barrel (ppb) to 5 ppb;
- wherein the wellbore fluid has no more than 3 wt % of alkaline earth metal in the wellbore fluid.
3 more elements
A method of completing a wellbore, the method comprising:
- drilling the wellbore with a wellbore fluid to form a filter cake on walls thereof, the wellbore fluid comprising:
- an aqueous base fluid comprising a monovalent brine;
- a modified starch;
- and
- a mixture of divalent metal oxides present at a concentration ranging from 2 pounds per barrel (ppb) to 5 ppb;
- wherein the wellbore fluid has no more than 3 wt % of alkaline earth metal in the wellbore fluid;
- emplacing a breaker fluid into the wellbore;
- and
- shutting in the wellbore for a period of time sufficient to initiate breaking of the filter cake.
6 more elements
Dependencies are inferred from the claim text.