The Cassia, Flamboyant, Immortelle, Mahogany, and Amherstia fields currently produce over 1.4 bcf/d for the Trinidad domestic gas market and Atlantic LNG Projects (Trains I and II). By early 2004 the gas rate should increase to about 2 bcf/d when two new projects start-up. These fields, plus the older Teak field are located in the Columbus Basin off the southeast coast of Trinidad.

The six fields have produced gas from 35 reservoirs, which are at depths from 5,084 ft tvdss to 13,000 tvdss, and with initial pressures from 2305 psi to 7420 psi. The production data show that the gases are condensates, with yields that vary from 1 b/MMscf up to 50 b/MMscf.

The reservoirs exhibit a number of production mechanisms, including volumetric, volumetric with compartmentalization (due to faulting), water-drive (weak to strong aquifers) and waterdrive with compartmentalization. These reservoirs generally produce at high initial rates (50 – 247 MMScf/d).

The paper shows examples of each recovery mechanism and reports the gas and condensate recovery factors. In addition, the paper documents the reserve distribution for the reservoirs, the number of wells required to develop each reservoir, and the well rates.

Keywords:
water breakthrough, waterdrive reservoir, abandonment pressure, production control, mechanism, gas monetization, condensate recovery factor, lng, immortelle, gas reservoir
Subjects:
Well & Reservoir Surveillance and Monitoring, Natural Gas Conversion and Storage, Reservoir Characterization, Reservoir Simulation, Formation Evaluation & Management, Liquified natural gas (LNG)
Copyright 2003, Society of Petroleum Engineers
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