Reactive cement compositions for sealing hydrocarbon containing subterranean zones and methods
AssigneeHalliburton Energy Services, Inc.
InventorsJames F. Heathman, Sears T. Dealy
Life of this patent
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Abstract
The present invention provides improved reactive cement compositions for sealing hydrocarbon containing subterranean zones and methods of using the cement compositions. The sealing compositions are basically comprised of water, a hydraulic cement, an organophillic clay, a hydratable gelling agent and a water soluble alkaline source in effective amounts.
Claims26
A composition for sealing a subterranean zone to prevent the uncontrolled flow of liquid hydrocarbons into or from the zone comprising:
- water present in an amount in the range of from about 35% to about 125% by weight of said composition;
- a hydraulic cement present in an amount in the range of from about 25% to about 75% by weight of said composition;
- an organophillic clay present in an amount in the range of from about 20% to about 60% by weight of said composition;
- a hydratable gelling agent present in an amount in the range of from about 0.1% to about 1% by weight of said composition;
- and
- a water soluble alkaline source present in an amount in the range of from about 1% to about 15% by weight of said composition.
A composition for sealing a subterranean zone to prevent the uncontrolled flow of liquid hydrocarbons into or from the zone comprising:
- water present in an amount in the range of from about 45% to about 60% by weight of said composition;
- Portland cement present in an amount in the range of from about 35% to about 45% by weight of said composition;
- an alkyl quaternary ammonium bentonite clay present in an amount in the range of from about 30% to about 40% by weight of said composition;
- welan gum present in an amount in the range of from about 0.1% to about 0.5% by weight of said composition;
- and
- sodium carbonate present in an amount in the range of from about 3% to about 10% by weight of said composition.
A method of sealing a subterranean zone to prevent the uncontrolled flow of liquid hydrocarbons into or from the zone comprising the steps of:
- providing a subterranean zone sealing composition comprising water, a hydraulic cement, an organophillic clay, a hydratable gelling agent and a water soluble alkaline source;
- and
- introducing said sealing composition into said zone.
Dependencies are inferred from the claim text.