Foamed cement slurry
AssigneeInstitute Francais du Petrole
InventorsEric Lecolier, Annie Audibert, Alain Rivereau
Life of this patent
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Abstract
The present invention relates to a formulation of a foamed cement slurry comprising in combination: at least one hydraulic binder from the group consisting of class G Portland cements, class H Portland cements, aluminous cements whose alumina content is at least above 30% by mass, sulfoaluminous cements and plasters, water whose proportion ranges between 20% and 60% by mass in relation to the mass of hydraulic binder, a foaming agent whose proportion ranges between 1% and 20% by mass in relation to the mass of hydraulic binder, the foaming agent being a hydrosoluble polymer comprising hydrophobic links, or a mixture of such polymers.
Claims14
1) A cementing material comprising:
- at least one hydraulic binder from the group consisting of class G Portland cements, class H Portland cements, aluminous cements whose alumina content is at least above 30% by mass, sulfoaluminous cements and plasters,
- water whose proportion ranges between 20% and 60% by mass in relation to the mass of hydraulic binder,
- a foaming agent whose proportion ranges between 0.2% and 20% by mass in relation to the mass of hydraulic binder, the foaming agent being a hydrosoluble polymer comprising hydrophobic units.
10) Use of a hydrosoluble associative polymer comprising hydrophobic units for foaming a cementing slurry comprising:
- at least one hydraulic binder from the group consisting of class G Portland cements, class H Portland cements, aluminous cements whose alumina content is at least above 30% by mass, sulfoaluminous cements and plasters,
- water whose proportion ranges between 20% and 60% by mass in relation to the mass of hydraulic binder,
- the proportion of associative polymer ranging between 0.2% and 20% by mass in relation to the mass of hydraulic binder.
11) A method of producing a foamed cement slurry, wherein the following stages are carried out:
- mixing a hydraulic binder with water so as to obtain a cement slurry, the hydraulic binder being selected from the group consisting of class G Portland cements, class H Portland cements, aluminous cements whose alumina content is at least above 30% by mass, sulfoaluminous cements and plasters, and the proportion of water ranges between 0.2% and 20% by mass in relation to the mass of hydraulic binder,
- introducing a foaming agent in the cement slurry, the proportion of foaming agent ranging between 0.2% and 20% by mass in relation to the mass of hydraulic binder, the foaming agent being a hydrosoluble polymer comprising hydrophobic units,
- pumping the cement slurry comprising the foaming agent, and
- injecting a gas into the cement slurry comprising the foaming agent and stirring the mixture of slurry and of gas so as to foam the slurry and to obtain a foamed cement slurry.
Dependencies are inferred from the claim text.