| Summary: | 碩士 === 國立成功大學 === 資源工程學系碩博士班 === 100 === The fluid flow in a heterogeneous reservoir is more complex than that in a homogeneous reservoir. To simplify the complexity, the reservoir properties (for example, permeability and porosity) in a heterogeneous reservoir may be replaced by using average reservoir properties. The purpose of this study was to study the pressure and flow rate affected by using average reservoir parameters in a heterogeneous reservoir.
In this study, equations based on Darcy’s law are used to calculate an average permeability for a heterogeneous reservoir by considering flow in series and in parallel. The equations based on the material balance equation are used to calculate an average porosity for a heterogeneous reservoir by considering flow in series and in parallel. The pressures and flow rates from reservoirs of heterogeneous reservoirs and reservoirs with average properties were compared using the results of reservoir simulation studies. The heterogeneous reservoirs considered in this included linear flow bed in series, linear flow bed in parallel, radial flow bed in series, and radial flow bed in parallel. The flow regime was divided into steady-state flow and transient flow. The constant terminal rate and constant terminal pressure of operating conditions were considered in reservoir simulation.
The major results and conclusions obtained from this study are: (1) In steady-state flow, the equation for average permeability estimation can be used in linear flow and radial flow. (2) In transient flow, the equations for average permeability and for average property estimation were incorrect for linear flow and radial flow. (3) For the more complex heterogeneous reservoirs, the error is greater. Therefore, it is difficult to use simple average parameters to simplify a heterogeneous reservoir when it has a complex rather than an average formation.
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