Audience
This practical seminar is directed at exploration, engineering, and drilling personnel who make operational decisions based on DST (Drill Stem Test) results or who use DST data in general exploration and exploitation work. It is also suitable for regional geologists who use show maps and pressures in correlation work, especially those looking for missed pay (bypassed pay) in old wells.
The seminar emphasizes practical application rather than theoretical derivations or computations. The comprehensive course manual contains DST charts from over 60 field examples which can be used later for troubleshooting problem DSTs.
Participants are encouraged to bring examples from their own work experience. The course is taught using visual aids keyed to the course manual. All material is covered in the exact order presented in the manual (slowly, clearly, and thoroughly). This eliminates the need for note-taking, allowing students to focus on lectures and discussions.
Course Outline
- Equipment Fundamentals and Pretest Planning
- Basic Pressure Chart Interpretation (Qualitative) to Identify Permeability Types
- How to Recognize Depletion of a Limited Volume Reservoir
- Differentiation of Depletion from ‘Supercharge’
- Recognizing Mechanical Problems (e.g. Tool Plugging, Packer and Valve Leaks)
- Pressure Gauge and Clock Malfunctions
- Quantitative Reservoir Analysis for:
- Kh, Skin, PI, Stable AOF, Reservoir Geometry
- Understanding Conflicts Between DST and Core/Log Data
- Missed Pay (Bypassed Production) by Identifying Formation Damage and ‘Deep’ Damage
- Closed Chamber Tests for Deep Overpressure, Sour Gas, or Tight Gas
- Significance of Recoveries of ‘Oil Cut Mud’ and Gas Rates of ‘TSTM’ to Exploration
- Making a Decision to Complete or Abandon a Wildcat Well with Only Marginal DST Results
- Interpreting Poorly Run Old DSTs Where Horner Analysis and Derivative Type Curves Will Not Yield Answers
