Cementing compositions and applications of such compositions to cementing oil (or similar) wells
AssigneeSchlumberger Technology Corporation
InventorsJohn Villar, Jean-Francois Baret, Michel Michaux, Bernard Dargaud
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Abstract
The present invention concerns a cementing composition for an oil (or similar) well, based on an aluminous hydraulic cement, fine particles, hollow microspheres, water in a quantity such that the porosity is in the range 25% to 50%, a dispersing agent, a setting accelerator for the aluminous cement and optionally, other conventional additives. The invention is of particular application to cementing conductor pipes in arctic zones or in deep-water wells.
Claims24
A cementing composition that develops greater than about 600 psi compressive strength in about 24 hours comprising a mixture of solids comprising at least one aluminous hydraulic cement constituted by at least 40% of monocalcium aluminate, fine particles, and a light material having a density of less that 0.8;
- water;
- a dispersing agent;
- and a setting accelerator for aluminous hydraulic cement, the ratio of the volume of water to the total volume of the composition being from 0.25 to 0.50.
A cementing composition prepared by mixing solids comprising at least one aluminous hydraulic cement constituted by at least 40% of monocalcium aluminate, fine particles, and a light material having a density of less than 0.8;
- water;
- a dispersing agent;
- and a setting accelerator for aluminous hydraulic cement, the ratio of the volume of water to the total volume of the composition being from 0.25 to 0.50.
A cementing composition that develops greater than about 600 psi compressive strength in about 24 hours prepared by mixing solids comprising at least one aluminous hydraulic cement constituted by at least 40% of monocalcium aluminate, fine particles, and a light material having a density of less that 0.8;
- water;
- a dispersing agent;
- and a setting accelerator for aluminous hydraulic cement, the ratio of the volume of water to the total volume of the composition being from 0.25 to 0.50.
A method of cementing a conductor pipe in a deep water well or in an arctic zone comprising cementing the well with a cementing composition comprising a mixture of solids comprising at least one aluminous hydraulic cement constituted by at least 40% of monocalcium aluminate, fine particles, and a light material having a density of less than 0.8;
- water;
- a dispersing agent;
- and a setting accelerator for aluminous hydraulic cement, the ratio of the volume of water to the total volume of the composition being from 0.25 to 0.50.
A method of cementing a conductor pipe in a deep water well or in an arctic zone comprising cementing the well with a cementing composition that develops greater than about 600 psi compressive strength in about 24 hours comprising a mixtures of solids comprising at least one aluminous hydraulic cement constituted by at least 40% of monocalcium aluminate, fine particles, and a light material having a density of less than 0.8;
- water;
- a dispersing agent;
- and a setting accelerator for aluminous hydraulic cement, the ratio of the volume of water to the total volume of the composition being from, 0.25 to 0.50.
A method of cementing a conductor pipe in a deep water well or in an arctic zone comprising cementing the well with a cementing composition that develops greater than about 600 psi compressive strength in about 24 hours prepared by mixing solids comprising at least one aluminous hydraulic cement constituted by at least 40% of monocalcium aluminate, fine particles, and a light material having a density of less than 0.8;
- water;
- a dispersing agent;
- and a setting accelerator for aluminous hydraulic cement, the ratio of the volume of water to the total volume of the composition being from 0.25 to 0.50.
Dependencies are inferred from the claim text.