Advanced hydraulics analysis optimizes tricone bit performance

A high-pressure drilling simulator, aided by computational fluid-dynamics analysis, shows that penetration rates and hole-cleaning properties can be improved through the realignment of bit nozzles.Factors that govern tricone bit performance include a nozzle system capable of cleaning the cones and wellbore as well as evacuating drill cuttings from under the bit.In contrast to conventional design, the orientation of this nozzle system serves to:Clean the cones with a grazing hydraulic flow.Impact the borehole from a vertical orientation.Clean the cuttings from the center of the bit then radially outward.Early workEarly rolling cutter bits, such as those invented by Howard Hughes in 1908, u...

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