Back to results
US 5,361,841 AGranted
Drilling and cementing with blast furnace slag/polyalcohol fluid
AssigneeShell Oil Company
InventorsArthur H. Hale, Kenneth M. Cowan
Life of this patent
Estimating the term…
Abstract
A drilling and cementing operation is carried out utilizing a universal fluid comprising blast furnace slag, water and a 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.
Claims22
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 and a polyalcohol 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 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
A method of drilling and cementing, comprising:
- drilling a wellbore with a drill string comprising a drill pipe utilizing a drilling fluid comprising water, blast furnace slag and a polyalcohol;
- circulating said drilling fluid down said drill pipe and up an annulus between said drill pipe and walls of said wellbore thus laying down a filter cake on said walls of said wellbore during said drilling, said wellbore being disposed in a formation having sufficient heat that heat is removed by said circulating of said drilling fluid;
- withdrawing said drill string and inserting a pipe, thus creating an annulus between said pipe and said walls of said borehole;
- adding additional blast furnace slag to said drilling fluid to produce a cementitious slurry;
- and
- displacing said cementitious slurry into at least a portion of said annulus;
- and
- maintaining said cementitious slurry in said at least a portion of said annulus until said heat from said formation activates said cementitious slurry to thus cause said cementitious slurry to set into a cement.
5 more elements
A method for drilling comprising
- drilling a wellbore with a drill string comprising a drill pipe utilizing a drilling fluid comprising water, blast furnace slag and a polyalcohol component;
- and
- 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.
Dependencies are inferred from the claim text.