This chapter deals with compositions for drilling muds and special chemical used for drilling muds. Drilling fluids are mixtures of natural and synthetic chemical compounds used to cool and lubricate the drill but, clean the hole bottom, carry cuttings to the surface, control formation pressures, and improve the function of the drill string and tools in the hole. Drilling muds are divided into two general types: water-based drilling muds and oil-base drilling muds. Each type needs special additives which are discussed in this chapter.
The type of fluid base used depends on drilling and formation needs, as well as the requirements for disposition of the fluids after it is no longer needed. Drilling muds are special class of drilling fluids used to drill most deep wells.

Supervisor(s)

. Onaiwu Oduwa

co-supervisor

NIL

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