Patent ID: 9580638
Date: 2017-02-28
CPC Classifications: C04B,C09K,E21B

Claim:
1. A method of cementing in a subterranean formation comprising: providing a set-delayed cement composition comprising pumice, hydrated lime, a a phosphonic acid derivative cement set retarder, and water; storing the set-delayed cement composition in a pumpable fluid state for a time period of at least about 1 day; reducing the density of the set-delayed cement composition by adding a liquid additive comprising a synthetic smectite and water after the step of storing the set-delayed cement composition; activating the set-delayed cement composition after the step of storing the set-delayed cement composition; introducing the set-delayed cement composition into a subterranean formation; and allowing the set-delayed cement composition to set in the subterranean formation.