Selecting a drill rig with an adequate fluid capacity is a key factor for supporting the production rate and avoiding stuck drill-pipe conditions. It is also important to properly match the fluid mixing and cleaning equipment with the drill-rig fluid capacity. If the mixing and cleaning equipment is undersized, the drill rig cannot reach optimum production rates because the drilled solids cannot be pumped out of the bore hole and cleaned as fast as the drill is capable of advancing. Likewise, a smaller drill rig can be used for rock drilling with a down-hole motor if an auxiliary pump and recycling system is used to enhance the fluid handling capability.
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