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

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

Research output: Contribution to journalArticle

99 Citations (Scopus)

Abstract

Shales and some tight-gas reservoirs have complex, multimodal pore-size distributions, including pore sizes in the nanopore range, causing gas to be transported by multiple flow mechanisms through the pore structure. Ertekin et al. (1986) 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 multimechanism flow can occur. Inspired by recent studies that have demonstrated the complex pore structure of shalegas reservoirs, which may include nanoporosity in kerogen, we first develop a numerical model that accounts for multimechanism flow in the inorganic-and organic-matter framework using the dynamicslippage 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 multimechanism flow in tight formations. Finally, we modify modern rate-transient-analysis 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-transientanalysis methods for reservoirs exhibiting multimechanism (non-Darcy) flow. The approach is considered to be useful for analysis of production data from shale-gas and tight-gas formations because it captures the physics of flow in such formations realistically.

Original languageEnglish (US)
Pages (from-to)230-242
Number of pages13
JournalSPE Journal
Volume17
Issue number1
DOIs
StatePublished - Jan 1 2012

Fingerprint

Kerogen
Pore structure
Pore size
Numerical models
Desorption
Gases
gas
Nanopores
Transient analysis
Biological materials
kerogen
Demonstrations
Physics
desorption
inorganic matter
Tight gas
Shale gas
gas reservoir
analysis
shale gas

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Geotechnical Engineering and Engineering Geology

Cite this

Clarkson, C. R. ; Nobakht, M. ; Kaviani, D. ; Ertekin, Turgay. / Production analysis of tight-gas and shale-gas reservoirs using the dynamic-slippage concept. In: SPE Journal. 2012 ; Vol. 17, No. 1. pp. 230-242.
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Clarkson, CR, Nobakht, M, Kaviani, D & Ertekin, T 2012, 'Production analysis of tight-gas and shale-gas reservoirs using the dynamic-slippage concept', SPE Journal, vol. 17, no. 1, pp. 230-242. https://doi.org/10.2118/144317-PA

Production analysis of tight-gas and shale-gas reservoirs using the dynamic-slippage concept. / Clarkson, C. R.; Nobakht, M.; Kaviani, D.; Ertekin, Turgay.

In: SPE Journal, Vol. 17, No. 1, 01.01.2012, p. 230-242.

Research output: Contribution to journalArticle

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