Hydraulic cement slurry
AssigneeElkem a/s
InventorEldar O. Dingsoyr
Life of this patent
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Abstract
The cement slurry of the present invention is gas tight, very low strength retrogression at high temperature, and substantially no tendency to settle or segregate. The cement slurry is made with a hydraulic cement, 5-85% microsilica based on the weight of the cement, 5-250% of a high density filler material based on the weight of the cement, 0-5% of a retarder (dry weight) based on the weight of the cement, 0-12% of a thinner (dry weight) based on the weight of the cement, 0-8% of a fluid loss additive (dry weight) based on the weight of the cement, 0-30% silica flour and/or silica sand based on the weight of the cement and water in such an amount that the cement slurry has a density between 1.95 and 2.40 g/cm.sup.3.
Claims17
An oil- and gas-well hydraulic cement slurry consisting essentially of
- a hydraulic cement,
- 5-85% microsilica based on the weight of cement;
- 5-250% of a high density filler material based on the weight of the cement, said high density filler material selected from the group consisting of barite, hematite and ilmenite,
- 0-5% of a retarder (dry weight) based on the weight of the cement,
- 0-12% of a thinner (dry weight) based on the weight of the cement,
- 0-8% of a fluid loss additive (dry weight) based on the weight of the cement,
- 0-30% of a silica material based on the weight of cement, said silica material selected from the group consisting of silica flour and silica sand, and
- water in such an amount that the cement slurry has a density between 1.95 and 2.40 g/cm.sup.3.
An oil- and gas-well hydraulic cement slurry consisting essentially of:
- a hydraulic cement;
- 5-85% of a microsilica based on the weight of the cement;
- 5-250% of a high density filler material based on the weight of the cement, said high density filler material selected from the group consisting of barite, hematite and ilmenite;
- 0.1-3% of a retarder (dry weight) based on the weight of the cement;
- 0.1-6% of a thinner (dry weight) based on the weight of the cement;
- 0.1-4% of a fluid loss additive (dry weight) based on the weight of the cement;
- 10-35% of a silica material based on the weight of cement, said silica material selected from the group consisting of silica flour and silica sand;
- and
- water in such an amount that the cement slurry has a density between 1.95 and 2.40 g/cm.sup.3.
Dependencies are inferred from the claim text.