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Pressure Build-Up Analyses on a heavy oil well would give an inconclusive result on pressure derivative curves. Some kind of Thermal Injection should be performed prior to implementing the operation of Pressure Build Up test, where the heat will lower the heavy oil reservoir fluid. Sensitivity of several parameters namely viscosity, permeability, porosity, and shut-in time were used in designing Pressure Build Up test. The model also has an outer boundary. This sensitivity would give various reservoir reach of the test or radius of investigation. The sensitivity test showed that viscosity influences more on radius investigation as compared to permeability, porosity, and shut-in time. Since the Pressure Build Up test must reach radial flow period before pressure transient arrives at the nearest boundary, the test scenarios with viscosity range from 5.602 to 24.796 cp were suitable for the well. Furthermore, the study was continued to correlate radius of investigation as a function of the parameters mentioned above. A constant value of the correlation obtained from this study was 1197.