Natural gas production from geothermal geopressured aquifers
Conference
·
OSTI ID:7223688
A unique form of geothermal energy exists in geopressured aquifers underlying the United States Gulf Coast. Water from such geopressured aquifers often contains natural gas. This paper deals with the production of natural gas from such reservoirs. We have classified geothermal geopressured reservoirs into three types based upon the natural gas content. In Type 1, the reservoir water is undersaturated with natural gas. However, it could still contain more than 40 standard cubic feet of natural gas per reservoir barrel of water. In Type 2, the reservoir water is fully saturated with natural gas and the reservoir may contain a small gas cap. Type 3 is a geopressured gas reservoir. The water is nearly immobile in the reservoir but the adjacent and underlying shales contain water with gas in solution, that may move into the reservoir. This paper presents computer studies of the production of multiphase fluids (natural gas, gas in solution and water) from geothermal geopressured reservoirs. The two phase, two dimensional simulator was developed for simulating reservoir production behavior of both nonisothermal and isothermal deformable reservoirs, and can be used for areal or cross-sectional studies. For Type 1 and Type 2 reservoirs, reservoir pressure variations with natural gas and water production were generated. It was found that substantial amounts of natural gas can be produced over a long period of time. Finally the model was used for simulating the reported production history of Anderson 'L', a geopressured gas reservoir in south Texas.
- OSTI ID:
- 7223688
- Report Number(s):
- CONF-761008-17
- Country of Publication:
- United States
- Language:
- English
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