Building Materials, Third Edition

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(h) Class H — intended for use as a basic cement from surface to 2440 m, when conditions
require moderate sulphate resistant type and can be used with accelerators and retarders
to cover a wide range of well depths and temperatures. No additions other than calcium
sulphate or water or both, shall be interground or blended with the clinker during
manufacture.
(j) Class J— intended for use as manufactured from 3660 to 4880 m depth, when conditions
require moderate to high sulphate resistant type under extremely high temperatures and
pressures and can be used with accelerators and retarders to cover a wide range of well
depths and temperatures. No additions other than calcium sulphate or water or both,
shall be interground or blended with clinker during manufacture.
The chemical and physical requirements of oil-well cement are given in Tables 20.1 and
20.2, respectively.

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