Offshore staff
(Asia-Pacific) - The TGT-2X appraisal well on the Te Giac Trang (TGT) structure on block 16-1 offshore Vietnam, an up dip follow-up well to last year's TGT-1X discovery well, has completed testing with a total combined flow rate of approximately 17,500 boe/d from the Miocene Lower Bach Ho 5.2 and Oligocene C intervals.
Two main pay zones were perforated and tested within the Miocene Lower Bach Ho 5.2 interval, one between 2,763.5 and 2,817 m, and the other between 2,666.5 and 2,726.5 m. A total of 89 m of pay was confirmed by log analysis in this reservoir horizon.
The combined stabilized flowrate from the two Miocene zones was 14,053 boe/d comprising 12,615 b/d of oil of 38° API gravity crude and approximately 8.63 MMcf/d of gas through a 1-in. choke size.
Flow rates were limited due to a mechanical failure in the surface separation equipment.
As was announced previously, the first drillstem test, over the Oligocene C interval, tested water-free at a stabilised rate of 3,300 b/d of oil of 37.5° API gravity crude and approximately 0.88 MMcf/d through a 52/64-in. choke size.
As was expected from the log analysis, water was produced from the lower set of perforations in the Miocene. The approximate 8% water cut has provided evidence of the presence of an aquifer, which will be factored into plans for the field's depletion management.
A third reservoir horizon, the Lower Bach Ho 5.1, was also identified, but not tested as this would limit the ability to retain the well as a future producer, as originally designed. This horizon had 18 m of net pay, and from the analysis of logs and oil samples from wireline formation tests, is considered to be oil-bearing and productive.
Success at the TGT-2X well confirms the presence of a highly prospective section of clastic reservoirs in block 16-1.
Regional mapping has defined a clastic play fairway that extends for some 80 km to the south and west of TGT along the eastern and southern parts of the Block. Data from the TGT wells provides a firm foundation for continued exploration drilling on this trend.
The well will be temporarily suspended and the rig will be moved immediately to drill a follow-up appraisal well, TGT-3X, approximately 10 km to the south on the TGT structure.
03/15/06
