Overview:
- At times of high solar activity, keep an eye on Earths magnetic field even at low latitudes
- The tool has been working OK for 1000m and all surveys have passed QC
–IFR geomagnetic values are used
–Rotational check shots have been taken- good result
–Surveys are analysed with multistation software
- The surveys suddenly start to fail the magnetic QC parameters
–No nearby steel
–Drilling fluid unchanged
–Check shot performed at last good survey station, still failing QC limits
–No real-time observatory magnetogram data available for the area
Magnetic survey QC issue
- Location: Brazil
- Drilling at 60deg inclination & 60deg magnetic azimuth
- Surveys not correced for drillstring interference
- Surveys start to fail magnetic QC test
....
View the entire Presentation:
Practical Consequences of Earth's Rings and How to Deal with Them
Truls Lynne Hansen - University of Tromsø
Inge Edvardsen - Baker Hughes