Slag-cement displacement by direct fluid contact
First Claim
1. A method for drilling and cementing a well, comprising:
- drilling a borehole utilizing a drilling fluid, thus producing a used drilling fluid;
combining ingredients comprising water, granulated water-quenched blast furnace slag, and activator to produce a cementitious slurry;
disposing a pipe within said borehole;
passing said cementitious slurry down said pipe; and
displacing said cementitious slurry up into an annulus surrounding said pipe through direct contact by a displacement fluid comprising a portion of said used drilling fluid.
1 Assignment
0 Petitions
Accused Products
Abstract
A wellbore is drilled utilizing a conventional drilling fluid or a drilling fluid such as one containing a cementitious component selected from blast furnace slag, a metal oxide component of an ionomer or a metal oxide component of a phosphate salt. A compatible cementitious slurry such as one containing blast furnace slag and an activator system is then introduced into the borehole and displaced up into an annulus by direct contact with a displacement fluid. Generally, in the case of the slag-containing drilling fluid the cementitious slurry is prepared by adding additional blast furnace slag and an activator such as a sodium hydroxide/sodium carbonate mixture to the used drilling fluid. Similarly, in the case of the ionomers or phosphates, additional metal oxide component and the reactive second component can be added to the used drilling fluid to produce the cementitious slurry.
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Citations
21 Claims
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1. A method for drilling and cementing a well, comprising:
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drilling a borehole utilizing a drilling fluid, thus producing a used drilling fluid; combining ingredients comprising water, granulated water-quenched blast furnace slag, and activator to produce a cementitious slurry; disposing a pipe within said borehole; passing said cementitious slurry down said pipe; and displacing said cementitious slurry up into an annulus surrounding said pipe through direct contact by a displacement fluid comprising a portion of said used drilling fluid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for drilling and cementing a well, comprising:
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combining granulated water-quenched blast furnace slag having a particle size within the range of 2,000 to 15,000 cm2 /g with an aqueous drilling fluid, granulated water quenched said blast furnace slag being present in an amount within the range of 1 to 100 lbs/bbl of said drilling fluid plus blast furnace slag; utilizing said drilling fluid in a well drilling operation to form a borehole to produce a used drilling fluid; combining additional granulated water quenched blast furnace slag and an activator with said used drilling fluid to produce a cementitious slurry; disposing a pipe within said borehole; passing said cementitious slurry down said pipe; and displacing said cementitious slurry up into an annulus surrounding said pipe by direct contact with a displacement fluid. - View Dependent Claims (12)
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13. A method for drilling and cementing a well, comprising:
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combining constituents comprising water and a metal compound proton acceptor component to produce a drilling fluid; utilizing said drilling fluid in a well drilling operation to form a borehole, thus producing a used drilling fluid and laying down a filter cake; contacting a reactive second component with said filter cake; disposing a pipe within said borehole after said filter cake is laid down; passing a cementitious slurry down said pipe; and displacing said cementitious slurry up into an annulus surrounding said pipe by direct contact with a displacement fluid. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. A method for drilling and cementing a well, comprising:
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drilling a borehole utilizing a drilling fluid, thus producing a used drilling fluid; combining ingredients comprising water, and granulated water-quenched blast furnace slag, to produce a cementitious slurry; disposing a pipe within said borehole; passing said cementitious slurry down said pipe; and displacing said cementitious slurry into an annulus surrounding said pipe through direct contact by a displacement fluid comprising a portion of said used drilling fluid.
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Specification