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24-Pet-B5 Reservoir Mechanics: December 2014

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

  1. Question 1 Well-testing terminology
  2. Question 2 Diffusivity equation and boundary conditions
  3. Question 3 Radius of investigation at the end of wellbore storage
  4. Question 4 Double-porosity buildup – storativity, fracture permeability, skin, average pressure
  5. Question 5 Reservoir limit test – pore volume and initial pressure
  6. Question 6 Sealing fault – distance to fault and test-duration validity
  7. Question 7 Interference – pressure at Well A from Well B's two-rate production

Start with Question 1 →

EGBC National Exam — Petroleum Engineering, 2014-Dec. 3 hours, closed book. This sitting's own cover page reads “98-Pet-B5, Well Testing,” not Reservoir Mechanics, and every question is pressure-transient/well-test analysis (radial diffusivity, drawdown/buildup, double-porosity, sealing-fault, interference). 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. Three of the seven questions (Q3, Q4, Q6) are chart-reading questions built around semilog/log-log plots with no printed data table — every plotted value used below was read from the printed figure and is flagged check where it feeds a boxed result.

Reference texts: Lee, J., Well Testing, SPE Textbook Series Vol. 1 (diffusivity equation, type curves, radius of investigation); Earlougher, R.C., Advances in Well Test Analysis, SPE Monograph Vol. 5 (Horner analysis, superposition in time, interference and reservoir-limit tests); Bourdet, D., Well Test Analysis: The Use of Advanced Interpretation Models, Elsevier (double-porosity/Warren–Root model, sealing faults); Warren, J.E. & Root, P.J., “The Behavior of Naturally Fractured Reservoirs,” SPE Journal, 1963.