The most integral and critical part of the geothermal wells is the casing sustainability and integrity of the cementation of the casings. The design procedure of the cementing process should be done intently which includes materials and methods which ensures that the total length of True Vertical Depth (TVD) of both the cased annulus and the open hole annulus is completely filled with the required amount of cement without any sort of internal or external leakage which will withstand long term exposure to geothermal fluids and temperature. Geothermal wells experience High Pressure and High Temperature (HPHT) to sustain and durable in such hostile conditions and for good zonal isolation cement design must be taken into account carefully. The downhole performance of cement slurries depends mainly on two parameters viz. Temperature and Pressure influencing the properties such as how these parameters maintain the necessary strength to support tubular and how long the slurry will pump. Out of these two parameters, the temperature has a more pronounced effect as bottom-hole temperature maintains the speed of chemical reactions during hydration of cement which ultimately results in cement strength development and cement setting. It is required to know the rise in temperature during the cement setting. The cementing materials, cement slurry designs, various equipment, and operational procedures are outlined and reviewed.

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