Wellbore Cement Compositions and Wellbore Cementing Methods

摘要

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.

主权项

1. A wellbore cementing method comprising:
using a dry cement composition containing:
substantially unhydrated cement powder; andretarder powder for cement, the retarder powder containing a retarder absorbed by solid carrier particles; adding water to the dry cement composition and forming a cement slurry; and placing the slurry in a wellbore and setting the placed slurry.