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24-Pet-A2 Petroleum Reservoir Fluids: December 2019

Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)

  1. Question 1 Reservoir Fluid Fundamentals
  2. Question 2 Ethane / n-Heptane Binary Phase Behaviour
  3. Question 3 Porosimetry and Undersaturated Oil PVT
  4. Question 4 Gas Z-Factor, Original Gas In Place, and Gas Viscosity
  5. Question 5 Flash and Differential Liberation PVT Data
  6. Question 6 Propane / n-Octane Flash Calculation
  7. Question 7 Separator Test and Flash/Differential PVT Conversion

Start with Question 1 →

EGBC National Exam — Petroleum Engineering, 17-Pet-A2 Petroleum Reservoir Fluids, 2019-Dec. 3 hours duration, closed book (ruler and approved calculator only). SEVEN questions are printed on the paper; per the exam notes, FIVE questions constitute a complete exam paper and only the first five as answered are marked. Every question is solved in full below (all seven, not just the five a candidate would normally submit) so this set also serves as complete study material.

Reference texts: McCain, W.D., The Properties of Petroleum Fluids, 3rd ed. (PennWell); Ahmed, T., Reservoir Engineering Handbook, 5th ed.; Craft, B.C. & Hawkins, M.F., Applied Petroleum Reservoir Engineering, 3rd ed.; Standing, M.B., Volumetric and Phase Behavior of Oil Field Hydrocarbon Systems; Danesh, A., PVT and Phase Behaviour of Petroleum Reservoir Fluids.

Check: Questions 2 and 6 are built around two classic published P–T phase-diagram figures (the ethane/n-heptane system of Kay, Ind. Eng. Reading exact bubble/dew/critical points off these charts, as the exam intends, is not possible from this source. Every requested quantity in Q2 and Q6 is instead computed analytically: pseudo-critical properties via Kay's mixing rule (the exam's own formula sheet supplies exactly this rule) and bubble/dew points via the standard Wilson K-value correlation, $K_i = (P_{ci}/P)\exp[5.373(1+\omega_i)(1-T_{ci}/T)]$ — the textbook approximate method for hand/exam flash calculations. This gives fully verifiable, reproducible numbers in place of a chart reading, but they are engineering estimates, not a literal digitization — flagged at each affected step below.