ABSTRACT
The requirements for oil well cements are laid down in the relevant specifications of the American Petroleum Institute (API), and are used as de facto standards all over the world. However, formal ISO international standards for oil well cementing are currently under development (Bensted, 1995). API Specification 10A, Specifications for Well Cements, divides oil well cements into several classes. Of these, classes G and H are the basic oil well cements, used most widely. Classes D, E, and F include retarded oil well cements, and Class C is a rapid-hardening cement. Class J includes special cements developed for high-temperature well cementing.
27.1 CLASS G AND CLASS H OIL WELL CEMENTS
