A major operator in SE Asia with a large offshore gas field is producing dry gas from 6 Subea Wells in relatively shallow water (~ 400 ft.). No Downhole Permanent Pressure gauges (DHPG) were installed or any means for individual well flow measurement. The operator contacted DRC because he was interested in knowing reservoir pressure, skin and permeability for his individual wells from pressure transient testing.

The six wells have been on line and producing large volumes of gas for several years. All wells produce from the same reservoir and are in direct communication with each other over the extent of the field. The wells exhibit extremely high permeability (>1 Darcy) and flow large volumes of gas (50 to 100 MMSCFD). The wells also all tie back to a common subsea header and flow to an offshore production facility where cumulative rate is measured.