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US 5,213,160 AGranted
Method for conversion of oil-base mud to oil mud-cement
AssigneeShell Oil Company
InventorsJames J. W. Nahm, Reece E. Wyant
Life of this patent
Estimating the term…
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.
Claims10
A method for cementing a well comprising:
- admixing an oil mud with (a) sufficient water settable hydraulic material and water to form a slurry having a total solid-to-oil volume ratio of about 1.4 to 2.2 and a water-to-hydraulic material weight ratio of about 0.15 to 0.60, and (b) sufficient accelerator or retarder to cause the oil mud to harden and set up at a preselected time;
- and
- displacing the slurry in the well, and allowing the oil mud to harden and set up.
Dependencies are inferred from the claim text.