Soil-cement compositions and methods
AssigneeHalliburton Energy Services, Inc.
InventorsKurt O. Lindstrom, Wendell D. Riley
Life of this patent
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Abstract
The present invention provides improved soil-cement compositions and methods of forming subterranean cementitious masses using the compositions. The soil-cement compositions are basically comprised of hydraulic cement, water present in the compositions in amounts sufficient to form slurries of the solids therein, a dispersant comprised of a mixture of sodium dihydrogen phosphate buffer, ferrous lignosulfonate, ferrous sulfate and tannic acid and soil present in an amount whereby the volume ratio of cement, water and dispersant to soil in the compositions is in the range of from about 0.3:1 to about 2.1:1.
Claims20
A soil-cement composition which sets into a hard mass consisting essentially of:
- hydraulic cement;
- water present in said composition in an amount sufficient to form a slurry of the solids therein;
- a dispersant consisting essentially of a mixture of sodium dihydrogen phosphate buffer, ferrous lignosulfonate, ferrous sulfate and tannic acid;
- and
- soil present in said composition in an amount whereby the volume ratio of cement, water and dispersant to soil in said composition is in the range of from about 0.3:1 to about 2.1:1.
A method of forming a hard cementitious mass in a subterranean location comprising:
- forming a cement slurry of hydraulic cement, water and a dispersant consisting essentially of a mixture of sodium dihydrogen phosphate buffer, ferrous lignosulfonate, ferrous sulfate and tannic acid;
- mixing soil with said cement slurry in an amount whereby the volume ratio of cement, water and dispersant to soil in the resulting mixture is in the range of from about 0.3:1 to about 2.1:1;
- and
- placing said mixture in said subterranean location.
A method of forming a cementitious subterranean foundation comprising:
- drilling a subterranean bore hole;
- simultaneously pumping a cement slurry of hydraulic cement, water and a dispersant consisting essentially of a mixture of sodium dihydrogen phosphate buffer, ferrous lignosulfonate, ferrous sulfate and tannic acid into said bore hole whereby it mixes with particulate soil produced therein, said cement slurry being pumped into said bore hole at a rate with respect to the rate of particulate soil produced therein whereby said cement slurry is mixed with said soil in a volume ratio in the range of from about 0.3:1 to about 2.1:1;
- pumping excess cement slurry-soil mixture produced in said bore hole which overflows said bore hole to a location from where said excess cement slurry-soil mixture is disposed of;
- and
- allowing said cement slurry-soil mixture in said bore hole to set into a hard cementitious mass therein.
Dependencies are inferred from the claim text.