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US 5,358,044 AGranted
Drilling and cementing with blast furnace slag/soluble/insoluble alcohol
AssigneeShell Oil Company
InventorsArthur H. Hale, Kenneth M. Cowan
Life of this patent
Estimating the term…
Abstract
A composition suitable for drilling and cementing comprising blast furnace slag, water, a soluble polyalcohol and an insoluble polyalcohol, the components of the drilling fluid being chosen so as to have a dual functionality in promoting the drilling fluid and thereafter in being functional constituents of a cementitious slurry.
Claims16
A method for drilling and cementing, comprising:
- drilling a wellbore with a drill string comprising a drill pipe utilizing a drilling fluid comprising water, blast furnace slag, a water soluble polyalcohol component and a water insoluble alcohol component;
- circulating said drilling fluid down said drill pipe and up an annulus between said drill pipe and walls of said borehole, thus laying down a filter cake on said walls of said borehole during said drilling and producing a used drilling fluid;
- withdrawing said drill string and inserting a pipe, thus creating an annulus between said pipe and said walls of said borehole;
- incorporating an activator system into a portion of said used drilling fluid to produce a cementitious slurry;
- and
- displacing said cementitious slurry into at least a portion of said annulus between said pipe and said walls of said borehole.
3 more elements
Dependencies are inferred from the claim text.