In many drilling operations, the drill string is stuck while pulling out after first having experienced tight hole, swabbing and overpulls.
This indicates the following shortcomings:
- Pulling out has continued for too long without remedial action.
- Drilling personnel have been allowed to struggle on their own without supervision or advice.
- Deterioration of the hole or of the mud properties has not been detected or recognised in time prior to pulling out.
- Incorrect practices, of which supervisory staff are not aware, have been used.