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Reservoir engineering formulas and calculations Chapter  1  31



             1.67    Hydrocarbon pore volume occupied by remaining oil

             Input(s)
                N:   Oil in Place (STB)
                N p :  Cumulative Oil Production (STB)
                B o :  Oil Formation Volume Factor (bbl/STB)


             Output(s)
                V ro :  Volume of the Remaining Oil (bbl)



             Formula(s)


                                                      V ¼ N N        B
                                                       ro        p    o
             Reference: Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 4,
             Page: 301.


             1.68    Hydrostatic pressure

             Input(s)
                mw:    Mud weight (ppg)
                TVD:    True Vertical Depth (ft)


             Output(s)

                HP:   Hydrostatic Pressure (psi)


             Formula(s)

                                                    HP ¼ mw   0:052   TVD


             Reference: Wikipedia.org.


             1.69    Incremental cumulative oil production in undersaturated reservoirs

             Input(s)
                N p :  Cumulative Oil Production (STB)
                ø o :  Oil PVT Function (rb/STB)
                G p :  Cumulative Gas Production (MSCF)
                ø g :  Gas PVT Function (rb/MSCF)
                GOR:    Average Gas Oil Ratio (SCF/STB)


             Output(s)

                DN p :  Incremental Oil Produced (STB)
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