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Drilling fluids service including provide drilling mud engineer and consultant, analysis and provide drilling fluids to drilling companies, sometimes also provide or recommend solids control equipments and solids control service, and drilling cuttings treatment and disposal service. 
Mud engineers play an important role in drilling, As the hole is drilled and gets deeper, more mud is required, and the mud engineer is responsible for making sure that the new mud to be added is made up to the required specifications. The chemical composition of the mud will be designed so as to stabilize the hole.