Wellbore cement compositions and wellbore cementing methods
First Claim
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1. A wellbore cement composition comprising:
- substantially unhydrated cement powder; and
non-cementitious additive powder for cement, the additive powder being formulated from ingredients including a liquid additive for cement and solid carrier particles, the liquid additive being absorbed by the solid carrier particles and including a material selected from retarders, drilling mud surfactants, fluid loss agents, organic dispersants, antifoam agents, cement set accelerators, foamers, foam stabilizers, and combinations thereof, and the additive powder containing a mass of the liquid additive at least one-half a mass of the solid carrier particles.
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Abstract
A wellbore cement composition includes substantially unhydrated cement powder and additive powder for cement. The additive powder is formulated from ingredients including a liquid additive for cement and solid carrier particles. The liquid additive is absorbed by the solid carrier particles. A wellbore cementing method includes using a dry cement composition, adding water to the dry cement composition, forming a cement slurry, placing the slurry in a wellbore, and setting the placed slurry. The dry cement composition contains substantially unhydrated cement powder and retarder powder for cement. The retarder powder contains a retarder absorbed by solid carrier particles.
29 Citations
20 Claims
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1. A wellbore cement composition comprising:
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substantially unhydrated cement powder; and non-cementitious additive powder for cement, the additive powder being formulated from ingredients including a liquid additive for cement and solid carrier particles, the liquid additive being absorbed by the solid carrier particles and including a material selected from retarders, drilling mud surfactants, fluid loss agents, organic dispersants, antifoam agents, cement set accelerators, foamers, foam stabilizers, and combinations thereof, and the additive powder containing a mass of the liquid additive at least one-half a mass of the solid carrier particles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A wellbore cement composition comprising:
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substantially unhydrated cement powder; and non-cementitious retarder powder for cement, the retarder powder containing a retarder absorbed by solid carrier particles, an amount of the retarder absorbed by the solid carrier particles exhibiting the property of delaying setting of a cement slurry longer than an equal amount of retarder in liquid form added to the cement slurry. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A wellbore cement composition formulated from ingredients comprising:
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a dry cement composition containing an admixture of; substantially unhydrated cement powder; and non-cementitious retarder powder for cement, the retarder powder being formulated from ingredients including a liquid retarder for cement and solid carrier particles, the liquid retarder being absorbed by the solid carrier particles and having a mass at least two times a mass of the solid carrier particles; and water sufficient to form a settable cement slurry. - View Dependent Claims (18, 19, 20)
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Specification