Advanced petroleum engineering Homework #04 for Chapter 4 PROPERTIES OF RESERVOIR FLUIDS 1. Calculate the gas deviation factor of a natural gas sample under reservoir pressure and temperature of 2,000 psia and 130°F, respectively. The composition of the natural gas, as measured in the laboratory, is the following: methane, 90%; ethane, 7.5%; propane, 1.5%; and n-Butane, 1%. Component Mole Frac. Mol. Wt. Pc Tc Methane 0.9 16.043 666.4 343.33 Ethane 0.075 30.070 706.5 549.92 Propane 0.015 44.097 616.4 666.06 n-Butane 0.01 58.123 527.9 734.46 2. Using the natural gas sample in Ex.1: (a) Calculate the specific gravity of the natural gas sample under atmospheric conditions. (b) Calculate the density of the same gas both at standard and reservoir conditions. Assume standard conditions to be 14.69 psia and 60°F. 3. Recompute the gas deviation factor of the natural gas sample based on the specific gravity calculated in Ex.2, and compare it with the result obtained in Ex.1. 4. Calculate the viscosity and compressibility of the gas mixture described in Ex. 1 at reservoir conditions. 5. Calculate the formation volume factor and expansion factor of the natural gas sample in Ex.1. Note: the equations of calculation for Ex.1~Ex.5 should be firstly introduced when you are doing your operations. 6. Describe the general classification of petroleum reservoirs (up to 6 categories). What factors determine the type reservoir? Name one large field from each category, along with its location and reservoir, by conducting a literature review. 7. Describe the processes related to constant composition expansion (CCE), differential vaporization, and constant volume depletion (CVD). Tabulate the parameters that can be obtained from each test, with briefly comments explaining how the results are utilized in reservoir studies.