A Critical Review on Material Balance Equation


  • Mohammad Mamun Ur Rashid Chittagong University of Engineering and Technology
  • M. Enamul Hossain




Complex Reservoir, Fractured Reservoir, Dual Permeability, Dual Porosity, Reserve Estimation, Original Gas In Place


Abstract: Reservoir engineers are no more fascinated to use the simplified Material Balance Equation (MBE) for a naturally fractured reservoir. Because of the complexity of naturally fractured reservoirs, reservoir engineers are trending to a modified version of the material balance equation for a good estimation of hydrocarbon. This study presents a new material balance equation for naturally fractured reservoir considering laminar fluid flow. The proposed model will be a reliable tool to estimate the initial hydrocarbon in place for fracture and matrix. A general material balance equation has been derived for the naturally fractured reservoir. By using the fundamentals of fluid flow, a velocity term has been incorporated into the derived model. This velocity term defines the condition of flow such as laminar and turbulent. Velocity for the laminar flow has been used to validate the model. By using field data, fracture compressibility versus original oil in place plot has been generated. The plot shows some deviation with one established model where no velocity was considered. A big number of hydrocarbons are left because of a significant pressure drop in a later stage of production. By using the material balance equation for the low-velocity fluid flow reservoir, the estimation of the reserve can be optimized.