UBD is a procedure used to drill oil and gas wells where the pressure in the wellbore is kept lower than the static pressure of the formation being drilled. As the well is being drilled, formation fluid flows into the wellbore and up to the surface. This is the opposite of the usual situation, where […]

Overpulls/ Stuck Pipe In Surface Hole If any tight hole is experienced when drilling with water the followint actions should be taken to prevent stuck pipe: When heavy overpulls are experienced, and the above precautions have been taken, but the weight indicator regularly indicate a drop-off in overpulls and then an increase again, do not […]