Coal slag universal fluid
First Claim
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1. A method for drilling, comprising:
- drilling a wellbore, with a drill string comprising a drill pipe, utilizing a drilling fluid comprising water, drill solids and coal slag;
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.
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Abstract
A composition suitable for drilling and cementing comprising coal slag, water and drill solids, 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. Also, a method for drilling using a drilling fluid containing coal slag so as to lay down a filter cake which is settable and which is compatible with a subsequent coal slag cementitious slurry.
170 Citations
35 Claims
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1. A method for drilling, comprising:
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drilling a wellbore, with a drill string comprising a drill pipe, utilizing a drilling fluid comprising water, drill solids and coal slag; 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. 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, drill solids and coal slag; 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 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 (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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- 26. A drilling fluid composition comprising water, drill solids and 1 to 100 lbs/bbl of said composition of coal slag.
Specification