Abstract
The assumption of constant reservoir permeability is not strictly applicable to reservoirs where rock properties undergo changes, such as stress-sensitive porous media. Most researches on the permeability stress sensitivity mainly concentrated on experimental approach, physical modeling or pressure transient analysis, whereas rate transient analysis does not attract much attention. Based on source/sink function method, this paper develops a seepage model of multi-fractured horizontal well incorporating stress-sensitive permeability. The model is semi-analytically solved by fracture discretization, Pedrosa’s transformation, perturbation theory, and integration transformation method. Not only pressure transient analysis, but also rate transient analysis is separately performed with relevant parameters. The model presented here can provide some insights into well dynamic forecasting during exploiting such reservoirs, and contribute to establish the theoretical basic for transient analysis efficiently.
Highlights
The transport of fluid in porous medium is so called percolation or seepage
We have surveyed a lot of literatures aiming at the stress sensitivity of porous media, which is generated from the effective stress of rock skeleton increasing and the pore pressure decreasing
Wang et al (2015) established the relationship between overburden pressure and effective stress considering stress arching effect in Sulige gas field and proved that the stress sensitivity of permeability greatly depends on stress arching ratio
Summary
The transport of fluid (liquid, gas and their mixture) in porous medium is so called percolation or seepage. Keywords Stress sensitivity · Multi-fractured horizontal well · Line-sink model · Hydraulic fracture discretization · Pressure transient analysis · Rate transient analysis This study develops a seepage model of multi-fractured horizontal well incorporating stress-sensitive permeability based on source/sink function method.
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