Drilling and cementing with blast furnace slag/soluble/insoluble alcohol
First Claim
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1. 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.
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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.
157 Citations
16 Claims
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1. A method for drilling and cementing, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification