Event . roundLAB / Ikon Science + Monarch Magnetics

Understanding the Size of the EOU

What determines the size of your wellbore's Ellipse of Uncertainty - and how
confidently can you use it?
 
Date: Wednesday, October 21, 2026  .  Following the ISCWSA 64th General Meeting
Time: 10:30 a.m. – 1:30 p.m.  .  3-hour session
Venue: Ikon Science office  .  12140 Wickchester Ln, Houston, TX 77079
Reserve your Spot

What we'll explore

  • Error-model terms, magnitudes, and confidence levels

  • Sensor calibration and geomagnetic referencing

  • Drillstring interference and SAG

  • Survey QC, MSA, and supported corrections

  • Real-time processing, post-processing, and field MWD input issues

  • Why positional uncertainty matters to drilling engineers, asset teams, geologists, and geophysicists

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Session Agenda — Oct 21, 2026

10:30 a.m. – 1:30 p.m. · Ikon Science Office, Houston

Time Session Presenter
10:30 – 11:00 What is EOU?
Estimated uncertainty, error-model terms, magnitudes and confidence level.		 Duk
11:00 – 11:10 Sensor calibration
Sensor-related error terms and the role of calibration.		 JAE / Duk*
11:10 – 11:30 Geomagnetic model usage
IGRF vs. HRGM, IFR1 and IFR2; groundshots within IFR1, assumptions and limitations.		 Monarch
11:30 – 11:40 Drillstring interference
How the assembly influences magnetic measurements; compass and magnet demo.		 Paul
11:40 – 11:55 SAG error
Mechanical effects, inclination error and positional uncertainty.		 Paul
11:55 – 12:05 Where EOU error terms matter
Survey QC, DFAC and implications of behavior beyond modeled error magnitudes.		 Duk
12:05 – 12:15 Lunch pickup & return to seats (Lunch Break) —
12:15 – 12:30 Improving EOU size
Accurate magnetic references, MSA and SAG correction.		 Paul
12:30 – 12:45 Operating model & human gross errors
Post-processing, real-time QC, field MWD manual inputs and steering decisions.		 Paul
12:45 – 1:15 Why EOU matters – and to whom
Drilling engineers/anti-collision, asset teams/production, geology and geophysics.		 Paul
1:15 – 1:30 Discussion & Q&A
Technical questions and operational applications.		 All presenters