Methods and compositions for cementing pipe strings in well bores
AssigneeHalliburton Energy Services, Inc.
InventorsJiten Chatterji, Roger S. Cromwell, Robert D. Kuhlman, Bobby J. King
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Abstract
The present invention provides improved methods and compositions for cementing pipe strings in well bores. The methods of the invention are basically comprised of preparing a cement composition comprised of a hydraulic cement, an epoxy resin, a hardening agent for the epoxy resin and sufficient water to form a pumpable slurry. Thereafter, the cement composition is introduced into the annulus between a pipe string and a well bore and the cement composition is allowed to set into a resilient impermeable solid mass.
Claims20
An improved well cement composition comprising:
- a hydraulic cement;
- an epoxy resin;
- a hardening agent for said epoxy resin;
- sufficient water to form a pumpable slurry;
- a gas selected from the group consisting of air and nitrogen present in said composition in an amount sufficient to produce a composition density in the range of from about 10 to about 16 pounds per gallon;
- a foaming agent;
- and
- a foam stabilizer.
An improved well cement composition comprising:
- a hydraulic cement;
- an epoxy resin selected from the group consisting of a condensation reaction product of epichlorohydrin and bisphenol A and an epoxidized bisphenoal A novolac resin and is present in an amount in the range of from about 8% to about 10% by weight of hydraulic cement therein;
- a hardening agent for said epoxy resin wherein said hardening agent is at least one member selected from the group consisting of aliphatic amines, aromatic amines and carboxylic acid anhydrides and is present in an amount in the range of from about 0.01% to about 0.02% by weight of hydraulic cement therein;
- sufficient water to form a pumpable slurry;
- a gas selected from the group consisting of air and nitrogen present in said composition in an amount sufficient to produce a composition density in the range of from about 10 to about 16 pounds per gallon;
- a foaming agent;
- and
- a foam stabilizer.
Dependencies are inferred from the claim text.