Deliverability projection model for overpressured gas-condensate reservoirs
During the depletion history of abnormally pressured reservoir, pressure is initially maintained by a decrease in the pore volume. The P/Z vs cumulative gas produced graph in such reservoirs shows two distinct slopes and the initial gas in place can be estimated by extrapolation of P/Z straight line after the reservoir gradient has been reduced to normal. This decrease in pore volume also results in a reduction in the effective permeability of the rock thus affecting the formation in-flow performance. In the gas-condensate reservoirs, hydrocarbon liquids drop out of the gas phase below the dewpoint pressures increasing the total liquids saturation. An increase in the liquid saturation decreases the relative permeability to gas. The paper develops a high pressure gas-condensate reservoir deliverability calculation incorporating the effect of gas permeability reduction due to a decrease in pore volume and increase in oil saturation.
- Research Organization:
- Amoco Production Co. (Intl.)
- OSTI ID:
- 5192188
- Journal Information:
- Soc. Pet. Eng. AIME, Pap.; (United States), Journal Name: Soc. Pet. Eng. AIME, Pap.; (United States) Vol. SPE 13706; ISSN SEAPA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
030300* -- Natural Gas-- Drilling
Production
& Processing
ENGINEERING
FLOW MODELS
FORECASTING
GAS CONDENSATE WELLS
GEOLOGY
GEOPRESSURE ANOMALIES
HYDRAULIC CONDUCTIVITY
MATHEMATICAL MODELS
OIL SATURATION
PERMEABILITY
POROSITY
PRODUCTION
RESERVOIR ENGINEERING
RESERVOIR ROCK
SATURATION
WELLS