Petroleum enginerring!

qctreBrwkshpi=250STB/D=6.0106psi1=0.75cp=3000ft=1.25RB/STB=0.25ft=25md=5=60ft=3500psi=20% a. Calculate the time at which the Ei function solution first becomes valid. b. Calculate the time after which the Ei function solution is no longer valid. c. Calculate and plot the pressure as a function of position on semilog graph paper at t=100 hours using the Ei function solution (or its logarithmic approximation) for r=0.25ft,r=1ft,r=2 ft,r=10ft,r=20ft,r=50ft,r=100ft,r=200ft,r=500ft, r=1000ft,r=2000ft,r=3000ft. Use the log approximation only if it is valid. d. Calculate the additional pressure drop due to the skin factor. 9. Given a reservoir with the following properties: qctreBrwkshpi=200STB/D=10.0106psi1=0.75cp=1000ft=1.25RB/STB=0.25ft=25md=3=50ft=3500psi=20% a) Calculate the time at which the Ei function solution first becomes valid. b) Calculate the time after which the Ei function solution is no longer valid. c) Calculate and plot the pressure as a function of position on semilog graph paper (pressure on linear axis, distance on log axis) at t=5 hours using the Ei solution (or its logarithmic approximation) for r=0.25,1,2,10,20,50,100,150,200,250,300,400,500, 750,1000ft. Use the log approximation only if it is valid. d) Calculate the additional pressure drop due to the skin factor. 10. Given a reservoir with the following properties: qctreBrwkshpi=50STB/D=10.0106psi1=0.15cp=1000ft=1.25RB/STB=0.25ft=5md=4.5=20ft=2500psi=20% a) Calculate the time at which the Ei function solution first becomes valid. b) Calculate the time after which the Ei function solution is no longer valid. c) Calculate and plot the pressure as a function of position on semilog graph paper (pressure on linear axis, distance on log axis) at t=5 hours using the Ei solution (or its log approximation) for r=0.25,1,2,5,10,20,50,100,150,200,250,300,400,500,750, 1000ft. Use the log approximation only if it is valid. d) Calculate and plot the pressure as a function of time on semilog graph paper (pressure on linear axis, time on log axis) at r=10ft using the Ei solution (or its log approximation) for t=0.0001,0.0003, 0.001,0.002,0.005,0.01,0.02,0.05,0.1,0.3,1,3,10,30 hours. Use the log approximation only if it is valid. e) Calculate the additional pressure drop due to the skin factor