The influence of KCl on the performance of oil well cement slurry

摘要

The influences of KCl on the performance of G-Grade oil-well cement are discussed in this article. The macro performances including the rheological property, filter loss of slurry and the thickening time, strength and shrinkage of cement are tested. And the reasons why those influence could happen are explained by analyzing the microscopic structure of the cement. The results show that: KCl takes participation in hydration reaction of cement, KalSiO_3 and Ca_4Al_2H_(0.34)O_(6.34)Cl_(1.67) are generated in the reaction that could improve the compressive strength of the cement and reduce the shrinkage of the cement, but there is a limited added amount, less than 12% (BWOW) is the best.