During managed pressure drilling (MPD) with a conventional drilling rig into a gas bearing formation severe losses were encountered. Surface pressures up to 180 Bar were recorded.
The well was temporarily killed by pumping 250 mT of LCM material and a viscous seal pill and the drilling rig was demobilized. In total 5300 m³ of mud was lost. A HWO/Snubbing operation was required to complete the well.
The objective was to;
Underbalanced well condition had to be expected during all activities.
Operation was conducted to full customer satisfaction.