Publications

In this paper, geomechanical approach was used to determine the well bore stability to minimize the cost of the risk and uncertainty factor caused by drilling problem in the reservoir production. A common problem encountered during drilling occurs because of severe mechanical instabilities at the borehole wall, where stress amplification has exceeded the strength of the rock. Therefore, a detailed study containing interaction between rock strength and state of stress was held.The rock strength is characterized by integrating densities and velocities from log data, while stress (breakout, drilling induced fractures) were mainly determined from the borehole imager. The degree of the overpressure caused by shale was also measured and combined, to build a complete stress tensor to identify the borehole stability.The purpose of this study is to determine the best borehole trajectory and the appropriate mud window to control the compressive tensile failure. It is also to prevent catastrophic tensile failure leading to formation breakdown or fluid loses through natural fractures.