Cementing additives and Slurry design

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Additives play significant role in oil and gas well cementing operations. There are varieties of cement additives that have been developed to allow the use of Portland cement in many different oil and gas well operations. In an attempt to formulate the appropriate cement slurry for any cementing job, the right additive must selected and the right quantity must be added. Additives have different functions and are broadly classified as accelerator, retarders, extenders, fluid loss agents, dispersants and many more. Each of the broad classification has different categories of additives that have been developed to perform almost the same function during cement slurry design. However, there some additives under each major type that are commonly used in cement slurry design for oil and gas well cementing operations.

In well cementing, Portland cement systems are designed for temperatures ranging from below freezing in permafrost zones to 662 oF (350 oC) in thermal recovery and geothermal wells. . also encounter pressures ranging from ambient to 30 000 psi (200 MPa) in deep wells. Accommodation of such variations in conditions was only possible through the development of cement additives [.

According to American Petroleum Institute Recommended Practice 10B, additives are materials added to cement slurry to modify or enhance desired property .
. Cement additives selected for cementing operations are an integral part of sound well design, construction and well integrity ..
Additives are available to enhance the properties of oil well slurries and achieve successful placement between the casing and the geological formation, rapid compressive strength development and adequate zonal isolation during the lifetime of the well.
.., additives are commonly added to cement formulations to; disperse cement particles, modify the setting time under temperature and pressure conditions in the well, control fltration losses of the liquid from the cement slurry during and after placement, compensate for shrinkage of the cement as it sets and hardens, improve interfacial bonding between cement and casing, and control infux and migration of formation fuids into the cement column during setting. they are diferent types of cement additives that have been developed to allow the use of Portland cement in many different oil and gas well applications .
. Each major type has different types of additives that have been developed to perform almost the same function during cement slurry design. However, there are some additives under each major type that are commonly used in cement slurry design for oil and gas well cementing operations. .