Drilling: Method for Pore Pressure Estimation Using Mechanical Specific Energy and Drilling Efficiency - IADC/SPE-178842-MS
An energy-based drilling mechanics methodology, the “DEMSE” method, has been developed and demonstrated to be useful in predicting pore pressure. The MSE and drilling efficiencies used in the DEMSE method are calculated from downhole drilling parameters and subsurface log data. The DEMSE approach, which is based on physical principles, is an improvement over the traditional empirical drilling parameter methods such as modified d-exponent. Pore pressure estimates from the DEMSE method generally agree in magnitude and trend with the pressure estimates derived from sonic log data. These findings demonstrate that downhole drilling mechanics data, when properly utilized, can be used as an independent method for estimating pore pressure in real-time at the bit (while drilling), and for post well analysis for improving pore pressure forecasts.
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