FluidModeler from Schlumberger is the next generation fluid modeling package which fulfils the fluid modeling workflows required in Petroleum Engineering workflows. An accurate description of a fluid’s phase behavior, density and viscosity are essential for robust field dynamic model up to the design of any petroleum production system. Fluid properties directly impact decisions at all stages of the reservoir life cycle, from planning the first well drilling program through to the final abandonment of the field. Thus, the quality of fluid property measurements is critically important for field development plan (FDP). In many situations, costs and challenges associated with sample acquisition and time demands of performing all of the necessary measurements are prolonged, thus models which can predict the fluid properties of reservoir fluids over the temperature, pressure and composition ranges experienced by these fluids become necessary.