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US 12,325,822 B2Granted
Compositions and methods for well cementing
AssigneeSchlumberger Technology Corporation
InventorsBipin Jain, Shameed Ashraf
Life of this patent
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Abstract
The effectiveness of expansive cement systems may be diluted when, during a well cementing operation, commingling takes place between the cement slurry and a spacer fluid, a drilling fluid, or both. Incorporating expansive agents in the spacer fluid or drilling fluid may reduce or negate the loss of expansion at the cement slurry/spacer interface or the cement slurry/drilling fluid interface, thereby promoting zonal isolation throughout the cemented interval.
Claims20
A composition, comprising:
- an aqueous cement slurry;
- and
- a non-aqueous additive comprising:
- a suspension of an expanding agent comprising calcium oxide or a mixture of calcium oxide and calcined magnesium oxide;
- and
- a viscosifying agent comprising hydrophobically modified biopolymers, the hydrophobically modified biopolymers comprising:
- acetone-formaldehyde-sodium-bisulfate polymer;
- and
- D-Glucopyranuronic acid, polymer with 6-deoxy-L-mannose, D-glucose, and D-mannose, calcium potassium sodium salt.
6 more elements
Dependencies are inferred from the claim text.