Publications

The knowledge of insitu stress direction and magnitude is important when building a geomechanical model. Wellbore image data has been demonstrated to be the most valuable data to assess the orientation and magnitudes the insitu stress. Through the use of wellbore imaging allows direct observation of stress induced wellbore failures from which a geomechanical model of the reservoir can be derived. The appearance of borehole breakout and tensile fracture which detected on wellbore image could be used as a constraint in calculating horizontal stress and rock strength.The Duri field is being developed by implementing steamflood technology starting from the southern areas to the northern areas. At the unsteamed area in North which is still producing under primary recovery technique, the reservoir pressure has already depleted below hydrostatic pressure, meanwhile, at southern areas where already injected by the steam, reservoir pressure increased above hydrostatic pressure. This pore pressure increase does not only lead the increase of fracture pressure but also changes the stress regime in some part of the Duri field. These changes should be incorporated in evaluating and mitigating risks during drilling, completion and production phase of the Duri field development.In this paper, we demonstrate how a geomechanical model is built in different type of stress regimes and how to use that model to quantify the risk associated with mud weights, and how to calculate the critical fault failure which impacted to field development in the faulted areas and steam injection strategy.