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US 5,476,144 AGranted
Conversion of oil-base mud to oil mud-cement
AssigneeShell Oil Company
InventorsJames J. W. Nahm, Reece E. Wyant
Life of this patent
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Abstract
A water-in-oil emulsion drilling fluid can be converted into an oil mud-cement slurry for use in oil well cementing procedures. Also, a universal fluid can be prepared using the water-in-oil emulsion drilling fluid by treating with an hydraulic material so that it will lay down a filter cake during drilling which can be triggered to set into a hard cement and bond to the formation after the above oil mud-cement slurry has been placed in the borehole at the conclusion of drilling.
Claims1
A method for drilling a well comprising:
- admixing oil and water with blast furnace slag to form a water-settable universal fluid;
- and
- drilling a borehole with the universal fluid and laying down a settable filter cake on the walls of the borehole;
- admixing oil and water with blast furnace slag to form a cement slurry and displacing the slurry into the well in contact with the filter cake;
- and
- causing the filter cake and cement to set up.
3 more elements
Dependencies are inferred from the claim text.