Overview:
- Continuous MWD/gMWD monitoring
- Continuous monitor total field interference in top hole section compare with design
- Proximity to closest well is positively detected by MWD ranging when gyro
survey well-path or surveys are not as designed
- Decision to drill ahead or plug back based on known location of closest well
- Preliminary risk estimate
- 30ppf casing weight, 200nT BtotalDip interference threshold, 2m bit clearance before contact
- Significant improvement in detection with 30 degree approach (v 40deg)
- Eventually 3-d graphics (of course)
- Specify casing size to detect
- Specify “noise” level
- Result is area where NO POSSIBLE CASING THIS SIZE (or larger) can be present
....
View the entire Presentation:
Scientific ISCWSA