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US 6,626,243 B1Granted
Methods and compositions for use in cementing in cold environments
AssigneeBJ Services Company
InventorVirgilio C. Go Boncan
Life of this patent
Estimating the term…
Abstract
Cement compositions for cementing wellbores in cold environments. The cement compositions may include a mixture of a reactive aluminum silicate, aluminum sulfate and hydraulic cement, and may include one or more other additives. The cement compositions may be formulated to have reduced heat of hydration as compared to conventional cements, making them suited for cementing in permafrost environments. The cement slurries may optionally be foamed using a foaming agent and energizing phase.
Claims24
A method of cementing within a wellbore, comprising:
- introducing a cement slurry comprising effective amounts of Portland cement, aluminum silicate and metal sulfate into a wellbore;
- and
- allowing said cement slurry to cure within said wellbore;
- wherein said metal sulfate comprises aluminum sulfate;
- and
- wherein said cement slurry is formulated from a cement composition comprising greater than or equal to about 50% Portland cement by weight of total dry blend prior to addition of water;
- and wherein said cement slurry contains effective amounts of aluminum silicate and aluminum sulfate such that said cement slurry exhibits a compressive strength of greater than about 90 psi as measured at 50° F. at 24 hours, in combination with a heat of hydration of equal to or less than about 6 Cal./Sec-kg (by weight of slurry) as measured at 45° F. immediately after mixing.
4 more elements
A method of cementing within a wellbore, comprising:
- introducing a cement slurry comprising effective amounts of Portland cement, aluminum silicate and metal sulfate into a wellbore;
- and
- allowing said cement slurry to cure within said wellbore;
- wherein said metal sulfate comprises aluminum sulfate;
- and
- wherein at least a portion of said cement slurry is allowed to cure at a temperature of less than or equal to about 32° F. within said wellbore.
3 more elements
A method of cementing within a wellbore, comprising:
- introducing a cement slurry comprising effective amounts of Portland cement, aluminum silicate and metal sulfate into a wellbore;
- and
- allowing said cement slurry to cure within said wellbore;
- wherein said metal sulfate comprises aluminum sulfate;
- and
- wherein said cement slurry cures to have a compressive strength of greater than or equal to about 1100 psi after freeze-thaw testing at atmospheric pressure per API RP 10B, section 14.6 (December, 1997).
3 more elements
A method of cementing within a wellbore, comprising:
- introducing a cement slurry comprising effective amounts of hydraulic cement, high reactivity metakaolin, and aluminum sulfate into a wellbore;
- and
- allowing said cement slurry to cure within said wellbore;
- wherein said cement slurry is formulated from a cement composition comprising greater than or equal to about 50% Portland cement by weight of total dry blend prior to addition of water.
1 more element
A method of cementing within a wellbore, comprising:
- introducing a cement slurry comprising effective amounts of Portland cement, aluminum silicate and initial sulfate into a wellbore;
- and
- allowing said cement slurry to cure within said wellbore;
- wherein said metal sulfate comprises aluminum sulfate;
- wherein said aluminum silicate comprises high reactivity metakaolin;
- and
- wherein said high reactivity metakaolin comprises:
- calcined anhydrous kaolin Al2O3.SiO2 composed of 97% SiO2+Al2O3+Fe2O3 having an average particle size of about 1.5 μM, and a specific gravity of about 2.5;
- or
- calcined anhydrous kaolin Al2O3.SiO2 composed of 98% SiO2+Al2O3+Fe2O3 having an average particle size of about 0.5 μM, and a specific gravity of about 2.5;
- or
- a mixture thereof.
9 more elements
A method of cementing within a wellbore, comprising:
- introducing a cement slurry comprising effective amounts of hydraulic cement, aluminum silicate and metal sulfate into a wellbore;
- and
- allowing said cement slurry to cure within said wellbore;
- wherein said metal sulfate comprises aluminum sulfate;
- and
- wherein at least a portion of said cement slurry is allowed to cure at a temperature of less than or equal to about 32° F. within said wellbore.
3 more elements
A method of cementing within a wellbore, comprising,
- introducing a cement slurry comprising effective amounts of hydraulic cement, aluminum silicate and metal sulfate into a wellbore;
- and
- allowing said cement slurry to cure within said wellbore;
- wherein said metal sulfate comprises aluminum sulfate;
- and
- wherein said cement slurry cures to have a compressive strength of greater than or equal to about 1100 psi after freeze-thaw testing at atmospheric pressure per API RP 10B, section 14.6 (December, 1997).
3 more elements
A method of cementing within a wellbore, comprising:
- introducing a cement slurry comprising effective amounts of hydraulic cement, aluminum silicate and metal sulfate into a wellbore;
- and
- allowing said cement slurry to cure within said wellbore;
- wherein said metal sulfate comprises aluminum sulfate;
- wherein said aluminum silicate comprises high reactivity metakaolin;
- and
- wherein said high reactivity metakaolin comprises:
- calcined anhydrous kaolin Al2O3.SiO2 composed of 97% SiO2+Al2O3+Fe2O3 having an average particle size of about 1.5 μM, and a specific gravity of about 2.5;
- or
- calcined anhydrous kaolin Al2O3.SiO2 composed of 98% SiO2+Al2O3+Fe2O3 having an average particle size of about 0.5 μM, and a specific gravity of about 2.5;
- or
- a mixture thereof.
9 more elements
A method of cementing within a wellbore, comprising:
- introducing a cement slurry comprising effective amounts of hydraulic cement, aluminum silicate and aluminum sulfate into a wellbore;
- and
- allowing said cement slurry to cure within said wellbore;
- wherein said cement slurry contains effective amounts of aluminum silicate and aluminum sulfate such that said cement slurry exhibits a compressive strength of greater than about 90 psi as measured at 50° F. at 24 hours, in combination with a heat of hydration of equal to or less than about 6 Cal./Sec-kg (by weight of slurry) as measured at 45° F. immediately after mixing.
1 more element
Dependencies are inferred from the claim text.