PORE PRESSURE EVALUATION USING WELL LOGGING AND DRILLING EXPONENT FOR A/R “C” MEMBER, A/R FORMATION, BED-15 FIELD, WESTERN DESERT, EGYPT

Document Type : Original Article

Authors

1 Geology Department, College of Science, University of Menoufia, Egypt

2 Drilling Engineering Department, The British University in Egypt, Cairo, Egypt

Abstract

Pore pressure evaluation is an integral part of the well planning and formation evaluation process. In order to drill well safely, it’s necessary to detect the pore pressure and fracture pressure so that the mud density can be optimized to provide sufficient overbalance, while being low enough so that formation integrity is not compromised.
In the areas where exploration and production histories are established, offset wells’ data can be used to provide detailed profiles of the expected pressures for those wells which about to be drilled. Other measurements, such as real time PP measurements, well influx, kick, mud logging outcomes (total gas, trip gas, and connection gas), MWD, and borehole instability different events (e.g., abnormal torque and dragging, tight holes, caving, hole enlargement or breakout, hole filling, and packing-off) can also be used.
In the present study, we will focus on pore pressure evaluation from both drilling and well logging data using Interactive Petrophysics (IP) software.
It was found that there is a good coincidence between the pore pressure values from Drilling Exponent (Dxc) and those values which obtained from well logging where it ranges between 9.3 to 10.0 ppg. By using modern methods and industry accepted concepts, relationships between petroleum geology and drilling engineering can be interpreted to give accurate estimations of formation pressures at any point during the well drilling.

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