Basic oil well cement

Details Basic oil well cement Basic oil well cement

C - Chemistry, Metallurgy

09

K

31/31

C09K 8/05 (2006.01) C04B 7/00 (2006.01)

Patent

CA 1087385

ABSTRACT A versatile hydraulic basic oil well cement, compatible with retarders and most common field additives and able to perform its intended function over a wide variety of downhole conditions, particularly temperature and pressure, comprises a common moderate or high sulfate resistant clinker and a weight ratio of calcium sulfate hemihydrate to insoluble anhydrite of 20:80 to 45:55. It can be made either by adding controlled amounts of gypsum and insoluble anhydrite to the grinding circuit or by blending ground hemihydrate and insoluble anhydrite to ground clinker.

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