EFFECTS OF BIT HYDRAULICS ON FULL-SCALE LABORATORY DRILLED SHALE.

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Tibbitts, Gordon A.
Sandstrom, John S.
Black, Alan D.
Green, Sidney J.
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The effects of bit hydraulics while drilling shale with a standard three-cone bit are examined. Tests were conducted by drilling into large diameter, intact shale samples at simulated downhole conditions in the Drilling Research Laboratory's Wellbore Simulator. The shale samples were recovered from massive surface outcroppings and preserved for laboratory use. The effects of hydraulic horse-power from 20 to 400 HHP and bit weights from 20,000 to 50,000 pounds on rate of penetration are presented.
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