Coring Trouble Shooting Guide
When any of these symptoms arise, come out of the hole immediately as damage may occur to bit and barrel.
Check pump strokes hourly or if pressure changes to determine if the pump is a problem or washout has occurred. When drilling, core pressure will fluctuate by c.200lbs. over and c. 200 lbs. under normal conditions.
SYMPTOMS POSSIBLE PROBLEM Sudden pressure increase
- Groove (O-ring) cut in bit due to diamond damage or wear.
- Foreign . . .