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The type of bit and drilling type requires more knowledge of the formations to be drilled. Clay and Sand formations can be drilled using mud rotary method with either fishtail bit or long tooth roller cone bit. Down hole hammer drilling is used when rocky formations are encountered.

Years ago rock formations were drilled with the mud rotary drilling using a short tooth roller cone bit, but the process was very slow. With the Air operated down hole hammer, drilling can be accomplished at a third of the drilling rate.

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15y ago

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