4D Finite element modeling of stress distribution in depleted reservoir of south Iraq oilfield

Abstract The harvest of hydrocarbon from the depleted reservoir is crucial during field development. Therefore, drilling operations in faced several problems like partial and total lost circulation. Continuing production without an active water drive or injection to support pressure will decrease pore fracture pressure. Moreover, this depletion affect distribution stress change mud weight window. This study focused on vertical stress, maximum minimum horizontal redistributions reservoirs due decreases and, consequently, effect 1D 4D robust geomechanical models are built based all available data a mature oil field. model was used estimate mechanical rock properties, were determined using poroelastic strain model. Furthermore, properties calibrated drained triaxial uniaxial compression tests. tested modular dynamic tester log MDT. Mohr–Coulomb applied calculate reservoir. According wells, target area has been classified into four main groups Mishrif depletion: highly, moderately, slightly, no region. Also, results showed that units had three categories state (from above low depleted): L1.1, L1.2, M1. mean average reduction magnitude 322 psi for 183.86 115.56 Thus, lower limit dropped high value which considered weak point. As result changing window became narrow.