Pore pressure estimation during drilling based on mechanical specific energy and drilling efficiency
Abstract
This paper describes DEMSE, a new method that uses surface drilling data to determine, in real time, the pore pressure needed to update the well design. This pore pressure estimation method is a combination of available drilling data (such as torque, rate of penetration and weight on bit), and drilling efficiency (DE), based on the concepts of mechanical specific energy (MSE) or the energy spent at the bit to remove a volume of rock and the differential pressure (wellbore pressure minus pore pressure). Unlike the d-exponent methodology (dXc), which is an empirical correlation considering only weight on bit (WOB), rotation per minute (RPM), and rate of penetration (ROP), DEMSE is an energy-based approach that also takes into account the torque (T) and mechanical properties in addition to WOB, RPM, ROP. The result shows that DEMSE has a significant benefit over the dXc method, in terms of predictive capability, by reducing the subjectivity that is involved in dXc-based pore pressure estimates. Moreover, the results of DEMSE are consistent with the pore pressure estimated by the well log data method.
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