Hole Cleaning
The following are possible indicators of hole cleaning problems:
- excessive overpull on connections and trips
- reduced overpull when pumping
- excessive fill after trips
- erratic and increasing torque while drilling
- lack of cuttings over shakers (or large slugs of cuttings followed by periods of very few cuttings).
Solutions to Hole Cleaning Problems
Circulation, no matter how long it is carried out, does not guarantee effective hole cleaning. Special tripping procedures may be necessary in wells with cutting beds and in wells with severe overgauge . . .