Cement Blend Compositions

摘要

A computer simulator predicts the performance of neat Portland cement systems, or Portland cement systems containing supplementary cementing materials (SCM). Parameters to be entered into the simulator include the cement blend composition, the Bogue composition of the Portland cement, the Blaine surface area of the Portland cement, the absolute density of the Portland cement, the SCM densities, the SCM chemical activity indices, the curing-temperature profile and the curing-pressure profile. The predictions may be verified by laboratory testing before using the cement system during a cementing treatment.

主权项

1. A method for optimizing the performance of a cement slurry that comprises a blend of water and Portland cement, comprising:
(i) defining an optimal cement slurry performance range, the performance comprising compressive strength, permeability, carbon footprint, slurry density or cost and combination thereof; (ii) determining one or more cement-parameter values, the parameters comprising a candidate cement-blend composition, a Bogue composition of the Portland cement, a Blaine surface area of the Portland cement, an absolute density of the Portland cement, a curing-temperature profile and a curing-pressure profile; (iii) using the cement parameter values to predict the cement slurry performance; and (iv) determining whether the predicted cement slurry performance is within the optimal range.