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24-Pet-B5 Reservoir Mechanics: May 2015

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

  1. Question 1 Well-testing terminology
  2. Question 2 Sealing fault – pressure after 5 days (method of images)
  3. Question 3 Drawdown test – permeability and skin from tabulated data
  4. Question 4 Gas-well buildup – pseudopressure analysis
  5. Question 5 Naturally fractured reservoir buildup – skin, initial pressure, storativity
  6. Question 6 Hydraulically fractured well – fracture half-length and skin
  7. Question 7 Two-rate flow test – initial reservoir pressure by superposition

Start with Question 1 →

EGBC National Exam — Petroleum Engineering, 2015-May. 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. Four of the seven questions (Q3–Q6) are chart-reading questions built around semilog/log-log plots; where a printed data table exists (Q3, Q6) it was used directly, and every value read from a chart with no table (Q4, Q5) 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, radial flow, wellbore storage); Earlougher, R.C., Advances in Well Test Analysis, SPE Monograph Vol. 5 (Horner analysis, superposition in time, sealing faults, two-rate tests); Bourdet, D., Well Test Analysis: The Use of Advanced Interpretation Models, Elsevier (double-porosity model, hydraulically fractured wells); Warren, J.E. & Root, P.J., “The Behavior of Naturally Fractured Reservoirs,” SPE Journal, 1963; Cinco-Ley, H. & Samaniego, F., “Transient Pressure Analysis for Fractured Wells,” JPT, 1981 (infinite-conductivity vertical fracture linear flow).