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...Introduction to drilling a well oil and gas wells are drilled down into the earth in order access hydrocarbon reservoirs provide conduit for flow surface various types of rig used drill these depending on application rigs built up heavy machinery specialist equipment required thousands metres use bits hole deeper connected via high strength steel pipe that allows lubricating mud be pumped bit also torque transmitted from pdc polycrystalline diamond compact tci tungsten carbide insert mill tooth once back at is conditioned by shale shakers desanders desilters centrifuges degassers separators tools recondition its original spec before being cool lubricate support bore hold formation fluids remove cuttings bottom transport sections lengths which determined primarily magnitude pressure section compared with fracture top essentially can as deep possible fluid starts approach weakest exposed rock has been known casing run cemented place this seals off formations protects freshwater aquifers ...