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what kind of geology will be encountered more than 85 percent of the time?
Mar 03, 2017

Mud rotary is productive in high water table areas with consolidated and unconsolidated formations. Dense formations with low water table or fractured zones are more suited for air rotary. The downside to a smaller rig is the air compressor capabilities. A downhole hammer is invaluable in hard formation, especially when several hundred feet of hard formation will be drilled. 

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