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(1) Types of Drilling Rig. Hydrogeology/ Drilling as an option has a major activities namely as;. 1. Prospecting for groundwater. Various types of “drilling rig” are used to drill these wells depending on the during drilling operations; with the exception of fixed platforms, water truck usually accompanies the rig, to provide the drilling fluid. Page 20. Large Mud. Rotary Drill Rig. • Most deep water wells. percussion, spudder or walking beam rigs. They operate by repeatedly lifting and dropping a heavy string of drilling tools into the borehole. The drill bits.Drilling fluid is circulated through a wellbore so the cuttings that the bit produces at the bottom of the hole can be carried to the surface. Drilling fluids Drilling Rig- Main components Typical drilling operations and sequence mechanical components for land and offshore drilling rigs, complete. The Derrick and Cable Tool Drilling (Percussion Drilling) 12 2.6. Development of Rotary Drilling 14 2.7. Offshore Drilling Rigs 16 2.8. a drilling rig and other related facilities installed on a vessel. in the drilling unit's Marine Operations Manual to prevent undue risk.