Why Exclusion Zones?
Problem With Drilling East/West
- Axial Magnetic Interference (AMI) is dominant error source (Az)
- 50% more error than Declination
Problems With the Corrections
- Multiple solutions
- Degraded accuracy
Available Corrections
- Single Station Correction (SSC)
- Multi-Station Analysis (MSA)
Exclusion Zones for Horizontal Wells
Existing Standards (SPE 125677):
- BGGM
- sin(Inc)*sin(Az) < 0.82
- ±35° from East/West
- IFR1
- sin(Inc)*sin(Az) < 0.91
- ±25° from East/West
Multiple Solutions
SSC Single Station Correction
- Bx and By are measured
....
View the entire Presentation:
East-West Exclusion Zones: Why Do We Have Them and How Can We Eliminate Them?
Chad Hanak, Ph.D.