Downhole valve facilitates underbalanced drilling

Pinnacle Operating Co. Inc., Shreveport, La. successfully used a new downhole deployment valve in an underbalanced drilling application to avoid formation damage, save rig time, and minimize drilling fluid costs in its Whitney 19 No. 1, North Louisiana sweet gas well, drilled in the James Lime trend.Underbalanced drilling is a specialized drilling technique in which the bottomhole pressure exerted by the hydrostatic head of the wellbore fluid column is less than the pressure of the formation being drilled.The downhole deployment valve (DDV) allowed rig personnel to trip the drillstring out of the well twice, during and following underbalanced drilling operations for the horizontal lateral...

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