Foamed cement compositions and methods
AssigneeHalliburton Energy Services, Inc.
InventorsJiten Chatterji, Roger S. Cromwell, Baireddy R. Reddy, Clyde R. Anderson, David E. McMechan
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Abstract
The present invention provides improved foamed well cement compositions and methods. The foamed cement compositions have improved properties and are basically comprised of hydraulic cement, amorphous silica surface treated with a mixture of organosilane coupling agents, sufficient water to form a slurry, sufficient gas to foam the slurry and a mixture of foaming and foam stabilizing surfactants present in an amount sufficient to facilitate the formation of the foam and stabilize the foamed composition.
Claims30
A foamed composition having improved properties upon setting including enhanced resiliency and enhanced compressive, tensile and bond strengths comprising:
- hydraulic cement;
- amorphous silica which has been surface treated with a mixture of organosilane coupling agents present in an amount in the range of from about 5% to about 40% by weight of hydraulic cement in said composition;
- sufficient water to form a slurry;
- sufficient gas to foam said slurry;
- and
- a mixture of foaming and foam stabilizing surfactants present in an amount sufficient to facilitate the formation of said foam and stabilize said foamed composition.
A foamed cement composition having improved properties upon setting including enhanced resiliency and enhanced compressive, tensile and bond strengths comprising:
- Portland cement;
- amorphous silica which has been surface treated with a 1:1 by weight mixture of 3-glycidoxypropltrimethoxy silane and 3-aminopropyltriethoxy silane present in an amount in the range of from about 10% to about 20% by weight of hydraulic cement in said composition;
- water present in an amount in the range of from about 58% to about 61% by weight of said hydraulic cement in said composition;
- nitrogen present in an amount in the range of from about 14% to about 15% by volume of said composition;
- and
- a mixture of foaming and foam stabilizing surfactants comprised of an ethoxylated alcohol ether sulfate present in an amount of about 63.3 parts by weight of said mixture, cocoylamidopropyl betaine present in an amount of about 31.7 parts by weight of said mixture and cocoylamidopropyl dimethylamine oxide present in an amount of about 5 parts by weight of said mixture, said foaming and foam stabilizing surfactant mixture being present in said composition in an amount in the range of from about 1% to about 3.75% by weight of water therein.
A method of cementing in a subterranean zone penetrated by a well bore comprising the steps of:
- (a) preparing a foamed cement composition comprised of hydraulic cement, amorphous silica which has been surface treated with a mixture of organosilane coupling agents present in said composition in an amount in the range of from about 5% to about 40% by weight of hydraulic cement in said composition, sufficient water to form a slurry, sufficient gas to foam said slurry and a mixture of foaming and foam stabilizing surfactants present in an amount sufficient to facilitate the formation of said foam and stabilize said foamed composition;
- (b) placing said foamed cement composition into said subterranean zone;
- and
- (c) allowing said foamed cement composition to set into a resilient solid mass therein.
Dependencies are inferred from the claim text.