Abstract

Deep wells are drilled down to 4000 m to 4600 m in true vertical depth (TVD) on the onland KG-Basin having target of upper Jurassic to lower Cretaceous sandstone formations. Basalt flows, fractured sandstones, tightly cemented siltstones, pyritic shales, abnormal pressures, and complicated transverse isotropic layers test the limits of well construction and engineering design at highpressure, high-temperature (HPHT) conditions. Traditional prognosis methods fail to identify the loss prone zones & to predict the abnormal pore pressure regimes and stress anisotropy created by the disturbed tectonic history and complex geological setting