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Chien Tony - One of the best experts on this subject based on the ideXlab platform.
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Modeling of Real Gas Flow Behavior in Porous Media
1993Co-Authors: Chien TonyAbstract:Due to the highly nonlinear variation of gas density and viscosity with respect to pressure, no analytical solution to the real gas diffusivity equation has ever been presented in the literature. Analytical solutions used in gas well testing and pressure analysis are based on idealized assumptions, such as small and/or constant gas compressibility and constant hydraulic diffusivity. These solutions, though widely used and easily applied, are not accurate. This research presents a detailed investigation in the behavior of real gas flow through porous media. Starting from the most fundamental flow equation a new real gas Potential is implemented to transform the nonlinear flow equation into a quasi-linear diffusivity equation. The effects of pressure-dependent fluid and rock properties such as gas viscosity, compressibility, porosity and permeability are included. Advanced analytical derivations with respect to nonconstant hydraulic diffusivity are performed, and an analytical solution method is successfully developed. Multiple-rate and multiple-well systems as well as bounded reservoirs of any shape are rigorously implemented by using the principle of superposition and an unsteady-state bounding technique. Validation of the model is favorably achieved by comparison with finite-difference simulation and type curve matching. Reservoir pressures and flowing bottomhole pressures calculated by the analytical solution presented in this study are more accurate than by those methods published in the literature. The new solution method is also applicable to a broad range of pressure changes and different flow periods. This is a significant contribution to transient pressure analysis, long-term well performance tests and production forecasts in natural gas reservoirs. Moreover, since the pressure-dependent porosity and permeability are included in this study, the general solution may be applied to abnormally pressured reservoirs and tight gas sands for improved predictions of gas reserves and flow performance.Petroleum and Geosystems Engineerin
D.d. Faulder - One of the best experts on this subject based on the ideXlab platform.
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Permeability-Thickness Determination from Transient Production Response at the Southeast Geysers
2015Co-Authors: D.d. FaulderAbstract:The Fetkovich production decline curve analysis method was extended for application to vapor-dominated geothermal reser-voirs for the purpose of estimating the permeability-thickness product (kh) from the transient production response. The ana-lytic dimensionless terms for pressure, production rate, decline rate, and decline time were derived for saturated steam using the real gas Potential and customary geothermal production units of pounds-mass per hour. The derived terms were numer-ically validated using “Geysers-like ” reservoir properties at ini-tial water saturation of 0 and at permeabilities of 1,10, and 100 mD. The production data for 48 wells in the Southeast Geysers were analyzed and the permeability-thickness products deter-mined from the transient production response using the Fetkov-ich production decline type curve. The kh results were in very good agreement with the published range at the Southeast Gey-sers and show regions of high permeability-thickness
