Development of a modified material balance equation for complex reservoirs with the inclusion of fluid velocity

Rashid, Mohammad Mamun Ur (2018) Development of a modified material balance equation for complex reservoirs with the inclusion of fluid velocity. Masters thesis, Memorial University of Newfoundland.

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Abstract

Material Balance Equation (MBE) is among the most widely used techniques to estimate the reserve of any types of hydrocarbon reservoir. Complex reservoirs, such as fractured oil reservoir and shale gas reservoir have been recognized as a potential energy sources where a substantial amount of reserve are trapped. Modified MBE for complex reservoir enhances the accuracy and assists production engineers to take a proper decision regarding the selection of the recovery techniques. The one of the aims of this study is to review the existing knowledge and find out the significant gap in previous research on numerous recently developed material balance equation. The central goal of this work is to develop two modified MBE for the mentioned reservoir types. These equations include the velocity of the fluid and other rocks and fluid properties: viscosity, permeability and length of the reservoir. The results showed that incorporating the velocity and other fluid properties increases the recovery of the reserves. An important factor to derive an MBE is effective compressibility which is ultimately influenced by fluid velocity, viscosity and permeability. A sensitivity analysis has been conducted that shows the influence of the change of these properties on effective compressibility. Performing reserve estimation procedure without shut in is a big challenge for the production engineer. No researcher has introduced any parameter of fluid velocity in MBE which are so far reviewed in this study. Because of the absence of velocity in the established MBE, production is needed to be shut in to estimate the reserve. The developed material balance model includes this important velocity term which enhances the recovery of reserves and allows to calculate the reserve without shut in. The results of the modelling and sensitivity analysis can be a future guideline to develop an impressive material balance model for fractured reservoir.

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