3D mechanical earth model for optimized wellbore stability, a case study from South of Iraq

Abstract Wellbore instability issues represent the most critical problems in Iraq Southern fields. These problems, such as hole collapse, tight and stuck pipe result tremendous increasing nonproductive time (NPT) well costs. The present study introduced a calibrated three-dimensional mechanical earth model (3DMEM) for X-field South of Iraq. This post-drill can be used to conduct comprehensive geomechanical analysis trouble zones from Sadi Formation Zubair Reservoir. A one-dimensional (1DMEM) was constructed using Well logs, core tests, pressure measurements, drilling reports, mud logs. Mohr–Coulomb Mogi–Coulomb failure criteria determined possibility wellbore deformation. Then, 1DMEMs were interpolated construct (3DMEM). 3DMEM indicated relative heterogeneity rock properties field stresses between southern northern studied field. shale intervals revealed prone more than others, with relatively high Poisson's ratio, low Young's modulus, friction angle, strength. best orientation directional Wells is 140° clockwise North. Vertical slightly inclined (less 40°) are stable angle Wells. integration 1 enables anticipating subsurface conditions proactive design new However, geomechanics investigations still have uncertainty due unavailability enough calibrating data, especially which related maximum horizontal magnitudes.