well testing course

3. Following completion, a 18 well is produced for some time, believed to be in transient behavior, before shut in for a lengthy build up test. The production history is summarised below: If the fluid and reservoir properties are summarised as rollows: k=65md,h=50ft,=0.22,=0.85cp,0=1.35rb/stb,Ct=35.0E06psi1, and pi=3500 psi. I. Calculate the minimum drainage radius. II. Calculate the wellbore pressure at the end of the seventh day using Horner's approximation if applicable or any other method if it doesn't