The data in below table were obtained in a pressure build-up test on an oil well producing above the bubble point. At (hours) Pws ( psia) 0 2752 0.3 3464 0.5 3640 1 3852 2 4055 3 4153 4 4207 s 4244 6 4251 8 4263 10 4272 12 4280 14 4287 16 4297 20 4303 24 4308 30 4313 36 4317 42 4320 50 4322 The well was produced only oil and has produced 13220 STB. Other data include the following; go = 1135 Stb/day, o = 0.6 cp, @ = 0.17, Bo = 1.214 Bbl/Stb, ¢ = 18 * 10° psi”!, rw = 0.5 ft, re = 1320 ft (well is centered in square drainage area, area is 160 acres), p, = 54.8 Ib/ft?, Ay = 0.036f¢2, h=28ft. 1- At what shut-in time (At) does after flow cease distorting the pressure build-up test data? 2- At what shut-in time (At) do boundary effects appear? 3- Determine formation permeability?

Q The data in below table were obtained in a pressure build-up test on an oil well producing above the bubble point. At (hours) Pws ( psia) 0 2752 0.3 3464 0.5 3640 1 3852 2 4055 3 4153 4 4207 s 4244 6 4251 8 4263 10 4272 12 4280 14 4287 16 4297 20 4303 24 4308 30 4313 36 4317 42 4320 50 4322 The well was produced only oil and has produced 13220 STB. Other data include the following; go = 1135 Stb/day, o = 0.6 cp, @ = 0.17, Bo = 1.214 Bbl/Stb, ¢ = 18 * 10° psi”!, rw = 0.5 ft, re = 1320 ft (well is centered in square drainage area, area is 160 acres), p, = 54.8 Ib/ft?, Ay = 0.036f¢2, h=28ft. 1- At what shut-in time (At) does after flow cease distorting the pressure build-up test data? 2- At what shut-in time (At) do boundary effects appear? 3- Determine formation permeability? 4- Calculate the skin factor for tested well? 5- Calculate the effective well-bore radius? 6- Calculate the additional pressure drop near the well-bore caused by the damage that is present. 7- Calculate the flow efficiency. 8- Verify the end of well-bore storage distortion? 9. Radius of investigation at beginning and end of MTR 10- Estimate the average pressure in the well's drainage area using the p* method.