(Solved): 20. Estimate formation permeability and skin factor from the buildup test data given the following ...

20. Estimate formation permeability and skin factor from the buildup test data given the following formation and fluid properties: h=56 ft; p=15.6 %; w=0.4 ft; B=1.232 RB/STB; q=10.1 x 10-6 psi-¹; and u = 1.35 cp. BUILDUP TEST DATA FOR EXERCISE 2.20 Time Rate (hours) (STB/D) 4 135 4 90 4 45 Time Time (hours) Pressure (psi) Pressure (psi) (hours) 0 6013.03 0.269 6193.72 0.006 6027.74 0.334 6197.96 0.013 6043.98 0.414 6200.83 0.022 6061.61 0.511 6202.82 0.033 6080.29 0.630 6204.31 6205.56 6206.70 0.046 6099.54 0.774 0.063 6118.68 0.950 0.082 6136.89 1.166 6207.80 0.107 6153.39 1.428 0.136 6167.52 1.748 0.172 6178.90 2.14 0.216 6187.54 2.62 6208.88 15.79 6209.95 19.27 6211.01 23.52 6212.06 24.00 Time Pressure (hours) (psi) 3.20 6213.09 3.91 6214.10 4.77 6215.09 5.83 6216.04 7.11 6216.96 8.69 6217.83 10.60 6218.65 12.94 6219.42 6220.12 6220.76 6221.34 6221.39