Practical Drillstem Test (DST) Interpretation
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Practical Drillstem Test (DST) Interpretation Course
Introduction:
This is designed for exploration, engineering and drilling personnel involved in making operational decisions based on DST results, who use DST data in general exploration/exploitation work.
Course Objectives:
This is focusing on qualitative DST pressure chart troubleshooting/interpretation and “quick & dirty” ways to assess a well’s potential from a DST. The course is designed to provide participants with information not normally encountered in routine service company training seminars and to impart analytical and interpretive skills gained by the instructor in over 25 years of experience.
By the end of the course, students should be able to accomplish the following:
- Diagnose damage, depletion, and mechanical malfunctions, such as tool plugging
- Determine permeability and forecast the stable flow rate if the well is completed
- Understand why data from cores and logs often conflict with DST data
- Make more sense of DST results printed in PIX well cards and field reports
- Make a decision as to whether to complete or abandon a wildcat with only marginal DST results
- Appreciate where recoveries of "oil cut mud" and gas rates of "TSTM" may be significant from an exploration standpoint
- Identify long narrow reservoirs (such as channel sands) from DST pressure behavior
- Design DSTS which preserve secrecy where competitors control adjacent land blocks
- Estimate the time until a well stabilizes
- Fully understand closed chamber DSTS
Who Should Attend?
This 5-day practical course is directed at exploration, engineering and drilling personnel concerned with making operational decisions based on DST results or who use DST data in general exploration/exploitation work. It is very useful for geologists evaluating old wells with DSTs for land acquisition.
Course Outlines:
- Well Engineering & Operations
- Drilling fluids and cementing
- Well-site data acquisition and quality control
- Well Delivery Process
- Rig Types and Personnel
- Types of rigs
- Land rigs
- Rig components
- Offshore rigs: jack-up rigs, submersible rigs, platform rigs, semi-submersible rigs, drill ships
- Rolling Cutter Bit
- Bit types
- Specification
- Grading worn bit
- Bit performance
- Types of DST’s (Straddle, Bottom Hole, Multiple Resets) and Their Applications
- Using DST Charts to Recognize Formation Damage
- Flow rate Estimation in Low Oil Rate DST’s
- Type Curves and Other Interpretive Plots
- Differentiating Between True Depletion and ‘Supercharge
- Completion-Abandonment Decisions Based on Marginal DST Results
- Closed Chamber DST Applications - Tight Gas, Sour Gas, Secrecy
- Significance of ‘Oil Cut Mud’ Recoveries and ‘TSTM’ Gas Rates
