Resilient well cement compositions and methods
AssigneeHalliburton Company
InventorsJiten Chatterji, Bobby J. King, Patty L. Totten, 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 and are basically comprised of cementitious material, an aqueous rubber latex and a latex stabilizer.
Claims20
A well cement composition having improved mechanical properties including elasticity and ductility comprising:
- a hydraulic cement;
- an aqueous rubber latex present in an amount in the range of from about 2.5% to about 45% by weight of hydraulic cement in said composition;
- an effective amount of a latex stabilizer;
- a defoaming agent comprised of polydimethylsiloxane present in an amount in the range of from about 0.1% to about 0.9% by weight of cement in said composition;
- a gas 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;
- an effective amount of a foaming agent;
- and
- an effective amount of a foam stabilizer.
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,
- an aqueous rubber latex present in an amount in the range of from about 2.5% to about 45% by weight of hydraulic cement in said composition,
- an effective amount of a latex stabilizer,
- a defoaming agent comprised of polydimethylsiloxane present in an amount in the range of from about 0.1% to about 0.9% by weight of hydraulic cement in said composition,
- a gas 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,
- 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.