551 Advanced Phase behaviour Assignment No.1 Characterization of reservoir fluids. Given the following reservoir fluid compositions: i- Based on the total molecular weight and composition classify the type of reservoir fluid. ii- Given the fluid composition construct the phase diagram using commercial software. How do you classify the type of reservoir fluid based on the phase diagram? Table (1) Compositions and molecular weight of some reservoir fluids Samples 1 2(1) 3(1) 4(1) 5 6(1) 7(1) Tf, (°F) 280 188 284 204 282 233 246 C1 0.558 0.585 0.397 0.6 0.686 0.967 0.954 C₂ 0.093 0.134 0.094 0.146 0.074 0.012 0.008 C3 0.059 0.074 0.066 0.077 0.04 0.003 0.005 C4 0.037 0.04 0.063 0.04 0.024 0.002 0.004 C5 0.026 0.02 0.042 0.022 0.015 0.003 0.002 C6 0.022 0.016 0.034 0.014 0.013 0.001 0.001 C7+ 0.172 0.119 0.089 0.094 0.086 0.006 0.011 N2 0.005 0.004 0.109 0.006 0.009 0 0.003 CO2 0.028 0.009 0.051 0.003 0.054 0.006 0.013 H2S 0 0 0.055 0 0 0 0 MWt 54 42 39 37 35 18 18 C7+ 188.39 165.57 114.31 151.85 169.96 218.8 103.2 MWt Assumed 0.75 0.75 0.75 0.75 0.75 0.7 0.75 C7+ SG Table B1: Examples of samples under C7+ criteria. Sample 8 9 10(1) T. (°F) 250 337 160 C1 0.634 0.791 0.583 C2 0.047 0.016 0.027 C3 0.032 0.004 0.01 C4 0.038 0.002 0.375 C. 0027 0.001

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