METHODS FOR IDENTIFYING MUD MOTOR STALL EVENTS DURING BOREHOLE DRILLING OPERATIONS

Abstract: methods for identifying mud motor stall events are provided herein. one method includes receiving drilling sensor data including a pressure measurement signal, calculating a smoothed pressure signal, calculating a pressure fluctuation signal, determining a pressure fluctuation distribution dataset, and calculating a set of statistical values from the pressure fluctuation distribution dataset, where the set includes a pressure fluctuation value for a selected percentile value and probability distribution parameters that characterize a selected theoretical probability distribution function. the method also includes calculating a theoretical pressure fluctuation value for another selected percentile value using the probability distribution parameters, identifying mud motor stall event(s) when a pressure measurement value from the pressure fluctuation signal is greater than the calculated pressure fluctuation value and the calculated theoretical pressure fluctuation value multiplied by a prescribed numerical value, and utilizing the identified mud motor stall event(s) to manage the borehole drilling operation.

Inventor(s): Gregory S. PAYETTE, Jeffrey R. BAILEY

CPC Classification: E21B21/08 (EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS)

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