초록 ▼

A well cementing composition comprises an hydraulic cement and flexible, acrylonitrile-butadiene copolymer particulate material. A method of cementing a well comprises mixing the composition with sufficient water, and optionally, other additives to form a pumpable slurry, and pumping the slurry into

A well cementing composition comprises an hydraulic cement and flexible, acrylonitrile-butadiene copolymer particulate material. A method of cementing a well comprises mixing the composition with sufficient water, and optionally, other additives to form a pumpable slurry, and pumping the slurry into the well and allowing it to set.

대표청구항 ▼

The invention claimed is: 1. A well cementing composition comprising an hydraulic cement and a flexible, acrylonitrile-butadiene copolymer particulate material wherein the copolymer is partially or fully hydrogenated. 2. The composition of claim 1, wherein the acrylonitrile content of the copolym

The invention claimed is: 1. A well cementing composition comprising an hydraulic cement and a flexible, acrylonitrile-butadiene copolymer particulate material wherein the copolymer is partially or fully hydrogenated. 2. The composition of claim 1, wherein the acrylonitrile content of the copolymer is between 18% and 50%. 3. The composition of claim 2, wherein the acrylonitrile content of the copolymer is between 30% and 45%. 4. The composition of claim 1, wherein the copolymer comprises carboxylate monomers to improve the thermal properties. 5. The composition of claim 1, wherein the copolymer has functional groups attached to the main chain to modify the properties of the base copolymer. 6. The composition of claim 4, wherein the copolymer has functional groups attached to the main chain to modify the properties of the base copolymer. 7. The composition of claim 1, further comprising hematite or manganese dioxide particulate. 8. The composition of claim 4, further comprising hematite or manganese dioxide particulate. 9. The composition of claim 5, further comprising hematite or manganese dioxide particulate. 10. The composition of claim 6, further comprising hematite or manganese dioxide particulate. 11. The composition of claim 1, wherein the copolymer has a median particle size in the range 100-500 microns. 12. A method of cementing a well comprising mixing a composition as claimed in claim 1 with sufficient water, and optionally, other additives to form a pumpable slurry, and pumping the slurry into the well and allowing it to set. 13. The method of claim 12, wherein the other additives comprise silica, antifoaming agents, dispersants, surfactants, retarders, weighting agents, expansion additives and fluid loss control additives. 14. The method of claim 12, wherein the compositions are mixed on site. 15. The method of claim 12, wherein the compositions are mixed on site. 16. The method of claim 12, wherein solid materials used in the compositions are provided in pre-mixed blends to which water and other liquid components are added prior to pumping into the well. 17. The method of claim 12, wherein solid materials used in the compositions are provided in pre-mixed blends to which water and other liquid components are added prior to pumping into the well.