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US 6,630,021 B2Granted
Cementing casing strings in deep water offshore wells
AssigneeHalliburton Energy Services, Inc.
InventorsB. Raghava Reddy, Russell M. Fitzgerald
Life of this patent
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Abstract
The present invention provides improved compositions and methods for cementing casing strings in deep water offshore formations penetrated by well bores. The cement composition basically comprises hydraulic cement, water, an environmentally degradable water reducing and dispersing additive, an environmentally degradable set retarding additive and an environmentally degradable compressive strength and set accelerating additive.
Claims20
A cement composition comprising:
- a single hydraulic cement;
- sufficient water to form a pumpable slurry;
- an environmentally degradable water reducing and dispersing additive that comprises polyaspartic acid;
- an environmentally degradable set retarding additive that comprises a lignosulfonate salt;
- and
- an environmentally degradable compressive strength and set accelerating additive that comprises a water soluble salt.
3 more elements
A foamed well cement composition comprising:
- a single hydraulic cement;
- sufficient water to form a pumpable slurry;
- a gas present in an amount sufficient to form a foam;
- an environmentally degradable foaming and foam stabilizing additive;
- an environmentally degradable water reducing and dispersing additive that comprises polyaspartic acid;
- an environmentally degradable set retarding additive that comprises a lignosulfonate salt;
- and
- an environmentally degradable compressive strength and set accelerating additive that comprises a water soluble salt.
5 more elements
Dependencies are inferred from the claim text.