Patent ID: 9062241
Filing Date: 2015-06-23
Classification: C04B,C09K,E21B,Y02W

Abstract:
1. A downhole cement composition comprising: a pumpable cement slurry including: where the primary weighting agent increases the density of the downhole cement composition, while maintaining other properties including at least pumpability, gas tight sealing, reduced tendency to segregate, and/or reduced high temperature cement strength retrogression, and where the composition has (1) a plastic viscosity at least 10% lower than a composition including an equivalent amount of hematite as the weighting agent, (2) a yield point at least about 15% lower than a composition including an equivalent amount of hematite as the weighting agent, (3) a cure rate at least 10% faster than a composition including an equivalent amount of hematite as the weighting agent, and (4) a cure strength after 6 hours of curing and a final cure strength at least 10% higher than a composition including an equivalent amount of hematite as the weighting agent.