A big-bore, high-pressure/high-temperature (HP/HT) drilling and completion program of seven wells was undertaken under challenging conditions in a low-pressure carbonate reef in Indonesia. Significant enhancements made during the program substantially reduced well times and cost. These wells incorporated the largest tubingless gas completions in the world. Higher-than-anticipated initial flow rates were achieved through an innovative strategy to decrease formation damage. The wells were completed openhole without pumping kill-weight fluids at the end of underbalanced drilling (UBD) operations. These wells are the first to combine bigbore completions, drill-in liners, and UBD in individual wellbores.Abnormal Pressure. A significant pressure ramp begins at approximately 7,500 ft TVD in the Keutapang formation and extends

fax 01-972-952-9435. AbstractA Big-Bore HTHP drilling and completion program of seven wells was undertaken under challenging conditions in a low pressure carbonate reef in Indonesia. Significant enhancements made during the program substantially reduced well times and cost. These wells incorporated the largest tubingless gas completions in the world. Higher than anticipated initial flow rates were achieved through an innovative strategy to decrease formation damage. The wells were completed open-hole without pumping kill weight fluids at the end of underbalanced drilling operations. These wells are the first to combine Big-Bore completions, drill-in liners and underbalanced drilling in individual wellbores.