Oil Well Cement:
This is a special type of cement required for sealing oil wells. Sealing is necessary to prevent the sides of the freshly drilled well from collapsing and to keep ground water out of the well shaft. This type of cement is manufactured by adjusting the proportion of iron oxide so that all the alumina is converted to tetra- calcium alumino ferrite (C4AF). Because of this the proportion of the compound tri- calcium aluminate (C3A) formed is very small and thus the setting time of cement is increased.
The given below are the uses of oil-well cement:
(a) It is used to cementing the oil wells.
(b) It is also used for protect the oil well casing from corrosion.