Back to results
US 5,382,290 AGranted
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.
Claims7
A composition for use in drilling and cementing a well comprising the product of:
- an oil mud admixed with sufficient blast furnace slag and water to form a slurry having a total solids-to-oil weight ratio of about 1.4 to 2.2 and a blast furnace slag weight ratio of about 0.15 to 0.60, to produce an oil-base universal fluid suitable for drilling a borehole and laying down a settable filter cake on the walls of said borehole;
- an effective amount of accelerator and/or retarder admixable with or contacting the filter cake, the accelerator and/or retarder being functional to cause the filter cake to harden and a salt selected from the group consisting of sodium chloride, potassium chloride, zinc chloride, sodium nitrate and ammonium sulfate.
Dependencies are inferred from the claim text.