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24-Pet-B1 Natural Gas Engineering: May 2016

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

  1. Question 1 Neutron Detectors and the Static SP
  2. Question 2 Characteristics that Affect Log Quality
  3. Question 3 Borehole-Diameter Effect on a 19½-in GNT Tool
  4. Question 4 Porosity-Log Response in Gas-Bearing Formations
  5. Question 5 Limitations of the Hingle Plot
  6. Question 6 Caliper Response and Spectral Gamma-Ray Isotopes
  7. Question 7 Order of Magnitude of the SNP Panel Correction
  8. Question 8 Interpreting the SP and Gamma-Ray Deflections
  9. Question 9 Water-Saturation Cutoff and Minimum Productive Resistivity
  10. Question 10 Humble Porosity and Hydrocarbon Saturation from a Core Sample
  11. Question 11 Neutron–Density versus Gamma-Ray Crossplot and the Fluid Type of Zones F and G
  12. Question 12 Ideal and Nonideal Shale-Membrane SP

Start with Question 1 →

National Exams, 98-Pet-B1, Well Logging and Formation Evaluation — May 2016, 3 hours, closed book (approved calculators permitted), 12 questions, all of them marked, values shown per question. neutron and density tools, SP, caliper, Archie, and log crossplots. There is no natural-gas-engineering content in the paper. All twelve questions are answered below.

Reference texts: Bassiouni, Theory, Measurement, and Interpretation of Well Logs (SPE Textbook Series Vol. 4); Asquith & Krygowski, Basic Well Log Analysis, 2nd ed. (AAPG Methods in Exploration 16); Ellis & Singer, Well Logging for Earth Scientists, 2nd ed.; Schlumberger, Log Interpretation Charts / Log Interpretation Principles and Applications.

The exam supplies a formula sheet (page 15) and four chart attachments: an SNP borehole-size correction chart and a nonideal-shale-membrane SP departure chart (page 16), SNP mud-weight and temperature/pressure correction charts (page 17), and a water-oil relative permeability ratio chart plus the Schlumberger Rw-equivalent conversion chart (page 18). Every chart reading below is quoted with the reading tolerance it deserves.