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24-Pet-B5 Reservoir Mechanics: May 2016

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

  1. Question 1 Well-testing terminology
  2. Question 2 Interference test – required production rate
  3. Question 3 Drawdown test – permeability, skin, and end of wellbore storage
  4. Question 4 Buildup test – permeability, initial pressure, and skin (Horner)
  5. Question 5 Extended drawdown – reservoir oil in place
  6. Question 6 Hydraulically fractured well – fracture half-length and flow regimes

Start with Question 1 →

EGBC National Exam — Petroleum Engineering, 2016-May. 3 hours, closed book, non-communicating calculator. This paper's own cover page reads “98-Pet-B5, Well Testing,” not Reservoir Mechanics — every question below is pressure-transient/well-test analysis. NOTES items 4/5 state that five (5) questions constitute a complete exam and only the first five as they appear are marked; all six questions on the paper are solved in full below. Three of the six questions (Q3, Q4, Q6) are chart-reading questions built around semilog/log-log plots with no printed data table for Q3/Q4; every value read from those charts is flagged check where it feeds a boxed result. Q6 ships a short printed data table for its early-time linear-flow fit; its flow-regime identification uses the full log-log pressure-change/derivative plot.

Reference texts: Lee, J., Well Testing, SPE Textbook Series Vol. 1 (diffusivity equation, radial flow, wellbore storage, superposition); Earlougher, R.C., Advances in Well Test Analysis, SPE Monograph Vol. 5 (Horner analysis, interference/pulse tests, reservoir-limit tests); Bourdet, D., Well Test Analysis: The Use of Advanced Interpretation Models, Elsevier (derivative diagnostic plot, flow-regime identification); Cinco-Ley, H. & Samaniego, F., “Transient Pressure Analysis for Fractured Wells,” JPT, 1981 (infinite-conductivity vertical fracture linear flow).