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US 10,894,911 B2Granted
Controlled activation of extended-life cement compositions
AssigneeHalliburton Energy Services, Inc.
InventorsThomas Jason Pisklak, Kyriacos Agapiou, Samuel J. Lewis
Life of this patent
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Abstract
Methods, compositions, and systems for cementing are included. The method comprises providing a cement composition comprising calcium-aluminate cement, water, a cement set retarder, and a cement set activator. The method further comprises introducing the cement composition into a subterranean formation and allowing the cement composition to set in the subterranean formation. The cement composition has a thickening time of about two hours or longer.
Claims20
A method of cementing comprising:
- storing a cement composition comprising calcium-aluminate cement, water, a cement set retarder, and a cement set activator in a pumpable fluid state for at least about 1 day, wherein the cement set activator comprises an alkaline species for increasing pH of the cement composition to induce activation, wherein the alkaline species is bound and/or encapsulated such that the activation does not occur during the storing;
- introducing the cement composition into a subterranean formation;
- and
- allowing the cement composition to set in the subterranean formation;
- wherein the cement composition has a thickening time of about two hours or longer, and wherein the calcium-aluminate cement comprises calcium aluminates in an amount greater than 50% by weight of dry calcium aluminate cement.
2 more elements
A cement composition comprising:
- calcium-aluminate cement, wherein the calcium-aluminate cement comprises calcium aluminates in an amount greater than 50% by weight of dry calcium aluminate cement,
- water,
- a cement set retarder that provides a barrier to hydration of the calcium-aluminate cement such that the cement composition is capable of remaining in a pumpable state in quiescent storage for a period of about one day or longer, and
- a cement set activator for increasing pH of the cement composition to induce activation, wherein the cement set activator is an alkaline species bound and/or encapsulated such that the activation of the cement composition does not occur during storing the cement composition.
1 more element
A system for cementing a subterranean formation comprising:
- a cement composition comprising:
- calcium aluminate cement, wherein the calcium-aluminate cement comprises calcium aluminates in an amount greater than 50% by weight of dry calcium aluminate cement,
- water,
- a cement set retarder that provides a barrier to hydration of the calcium-aluminate cement such that the cement composition is capable of remaining in a pumpable state in quiescent storage for a period of about one day or longer, and
- a cement set activator for increasing pH of the cement composition to induce activation, wherein the cement set activator is an alkaline species bound and/or encapsulated such that the activation of the cement composition does not occur during storing the cement composition;
- mixing equipment capable of mixing the cement composition;
- pumping equipment capable of pumping the cement composition through a conduit and into a wellbore annulus that is penetrating the subterranean formation.
4 more elements
Dependencies are inferred from the claim text.