Production analysis of tight gas and shale gas reservoirs using the dynamic-slippage concept

C. R. Clarkson, M. Nobakht, D. Kaviani, T. Ertekin

Research output: Chapter in Book/Report/Conference proceedingConference contribution

15 Scopus citations

Abstract

Shales and some tight gas reservoirs have complex, multi-model pore size distributions, including pore sizes in the nanopore range, causing gas to be transported via multiple flow mechanisms through the pore structure. In 1986, Ertekin et al. developed a method to account for dual mechanism (pressure- and concentration-driven) flow for tight formations that incorporated an apparent Klinkenberg gas-slippage factor that is not a constant, which is commonly assumed for tight gas reservoirs. In this work, we extend the dynamic- slippage concept to shale gas reservoirs, for which it is postulated that multi-mechanism flow can occur. Inspired by recent studies that have demonstrated the complex pore structure of shale gas reservoirs, which may include nanoporosity in kerogen, we first develop a numerical model that accounts for multi-mechanism flow in the inorganic and organic matter framework using the dynamic-slippage concept. In this formulation, unsteady-state desorption of gas from the kerogen is accounted for. We then generate a series of production forecasts using the numerical model to demonstrate the consequences of not rigorously accounting for multi-mechanistic flow in tight formations. Finally, we modify modern rate-transient methods by altering pseudovariables to include dynamic-slippage and desorption effects and demonstrate the utility of this approach with simulated and field cases. The primary contribution of this work is therefore the demonstration of the use of modern rate transient methods for reservoirs exhibiting multi-mechanistic (non-Darcy) flow. The approach is considered to be useful for analysis of production data from shale gas and tight gas formations as it captures the physics of flow in such formations realistically.

Original languageEnglish (US)
Title of host publicationSociety of Petroleum Engineers - SPE Americas Unconventional Gas Conference 2011, UGC 2011
PublisherSociety of Petroleum Engineers (SPE)
Pages570-585
Number of pages16
ISBN (Print)9781617829826
DOIs
StatePublished - 2011

Publication series

NameSociety of Petroleum Engineers - SPE Americas Unconventional Gas Conference 2011, UGC 2011

All Science Journal Classification (ASJC) codes

  • Fuel Technology
  • Geochemistry and Petrology
  • Geotechnical Engineering and Engineering Geology

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