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US 5,635,458 AGranted
Water-based drilling fluids for reduction of water adsorption and hydration of argillaceous rocks
AssigneeM-I Drilling Fluids Company
InventorsLi-Jein J. Lee, Arvind D. Patel
Life of this patent
Estimating the term…
Abstract
The present invention provides a water-based drilling fluid that reduces water adsorption and hydration of argillaceous rocks. The drilling fluid comprises a glycol with a molecular weight of less than about 200, an organic cationic material such as salts of choline or an organic salt of potassium, a filtration control agent, a viscosifier and water.
Claims18
A water-based drilling fluid comprising:
- a glycol with a molecular weight of less than about 200 at a concentration of at least 10% by weight of the aqueous phase of said drilling fluid said glycol being selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, butylene glycol and mixtures thereof;
- an organic cationic material in a concentration of at least bout 3% by weight of the aqueous phase of said drilling fluid, said organic cationic material being selected from the group consisting of choline hydroxide, choline chloride, choline carbonate, choline bicarbonate, choline sulfate and mixtures thereof;
- a filtration control agent for lowering fluid loss of said drilling fluid;
- a viscosifier for suspension of solids or weighting materials in said drilling fluid;
- and
- water.
3 more elements
A water-based drilling fluid comprising:
- a glycol with a molecular weight of less than about 200 at a concentration of at least 10% by weight of the aqueous phase of said drilling fluid said glycol being selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, butylene glycol and mixtures thereof;
- a salt of choline in a concentration of at least about 3% by weight of said drilling fluid said salt of choline being selected from the group consisting of choline hydroxide, choline chloride, choline carbonate, choline bicarbonate, choline sulfate and mixtures thereof;
- a filtration control agent for lowering fluid loss of said drilling fluid;
- a viscosifier for suspension of solids or weighting materials in said drilling fluid;
- and
- water.
3 more elements
A method of reducing water adsorption and hydration of argillaceous rocks during drilling with a water based drilling fluid comprising:
- preparing a water-based drilling fluid by pre-solubilizing a fluid loss control agent, a viscosifier, and a pH control agent in a make-up fluid, adding a glycol with a molecular weight of less than about 200 at a concentration of at least 10% by weight of the aqueous phase of said drilling fluid said glycol being selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, butylene glycol and mixtures thereof, adding a salt of choline to said drilling fluid in a concentration of at least about 3% by weight of said aqueous phase, said salt of choline being selected from the group consisting of choline hydroxide, choline chloride, choline carbonate, choline bicarbonate, choline sulfate and mixtures thereof, and adjusting the weight of said drilling fluid by adding a weighting material;
- and
- circulating said drilling fluid through said argillaceous rock during drilling.
A water based drilling fluid comprising:
- a glycol with a molecular weight of less than about 200 at a concentration of at least 10% by weight of the aqueous phase of said drilling fluid said glycol being selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, butylene glycol and mixtures thereof;
- an organic salt of potassium in a concentration of at least about 3% by weight of the aqueous phase of said drilling fluid;
- a filtration control agent for lowering fluid loss of said drilling fluid;
- a viscosifier for suspension of solids or weighting materials in said drilling fluid;
- and
- water.
3 more elements
Dependencies are inferred from the claim text.