Resilient well cement compositions and methods
AssigneeHalliburton Energy Services, Inc.
InventorsJiten Chatterji, Bobby J. King, Patty L. Onan, David D. Onan
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Abstract
The present invention provides resilient cement compositions and methods which are particularly useful in the construction and repair of oil and gas wells. The cement compositions have improved mechanical properties including elasticity and ductility.
Claims20
A well cement composition having improved mechanical properties including elasticity and ductility comprising:
- a hydraulic cement;
- fumed silica present in an amount in the range of from about 5% to about 30% by weight of hydraulic cement in said composition;
- sufficient water to form a pumpable slurry;
- a gas present in an amount sufficient to foam said cement composition;
- an effective amount of a foaming agent;
- and
- an effective amount of a foam stabilizer.
A well cement composition having improved mechanical properties including elasticity and ductility comprising:
- Portland cement;
- fumed silica present in an amount in the range of from about 5% to about 30% by weight of said cement in said composition;
- water present in an amount in the range of from about 22% to about 95% by weight of said cement in said composition;
- a gas selected from the group of air and nitrogen present in an amount sufficient to foam said cement composition and produce a cement composition density in the range of from about 8 to about 16 pounds per gallon;
- a foaming agent comprised of the sodium salt of alpha-olefinic sulfonic acid present in an amount in the range of from about 4% to about 9.5% by weight of said water in said composition;
- and
- a foam stabilizer comprised of cocoylamidopropylbetaine present in an amount in the range of from about 2% to about 5% by weight of said water in said composition.
A method of cementing in a subterranean well whereby the set cement can withstand impacts, shocks and cemented pipe movements subsequently generated by drilling and other well operations without cracking, shattering or otherwise failing comprising the steps of:
- introducing a cement composition which sets into a high strength solid mass having elasticity and ductility into said well, said cement composition comprising:
- a hydraulic cement,
- fumed silica present in an amount in the range of from about 5% to about 30% by weight of hydraulic cement in said composition,
- sufficient water to form a pumpable slurry,
- a gas present in an amount sufficient to foam said cement composition,
- an effective amount of a foaming agent, and
- an effective amount of a foam stabilizer;
- and
- allowing said cement composition to set in said well.
Dependencies are inferred from the claim text.