Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)
EGBC National Exam — Petroleum Engineering, 2015-Dec. 3 hours, closed book. This paper's own cover page reads “98-Pet-B5, Well Testing,” not Reservoir Mechanics, and every question below is pressure-transient/well-test analysis. NOTES item 4/5 state that five (5) questions constitute a complete exam and only the first five as they appear are marked; all seven questions on the paper are solved in full below. The one reference chart supplied with this paper (the page-7 “plot of dimensionless pressure versus dimensionless time”) is the generic exact line-source curve $p_D=0.5[-\mathrm{Ei}(-1/4t_D)]$, so every reading from it below is computed directly from that expression.
Reference texts: Lee, J., Well Testing, SPE Textbook Series Vol. 1 (diffusivity equation, radial flow, wellbore storage); Earlougher, R.C., Advances in Well Test Analysis, SPE Monograph Vol. 5 (Horner analysis, superposition in time, reservoir-limit test, multi-rate tests); Bourdet, D., Well Test Analysis: The Use of Advanced Interpretation Models, Elsevier (log-log diagnostic plots, wellbore storage); Warren, J.E. & Root, P.J., “The Behavior of Naturally Fractured Reservoirs,” SPE Journal, 1963.
