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: Chapter in Book/Report/Conference proceedingConference contribution

8 Citations (Scopus)

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
Pages570-585
Number of pages16
StatePublished - Sep 9 2011
EventSPE Americas Unconventional Gas Conference 2011, UGC 2011 - The Woodlands, TX, United States
Duration: Jun 14 2011Jun 16 2011

Other

OtherSPE Americas Unconventional Gas Conference 2011, UGC 2011
CountryUnited States
CityThe Woodlands, TX
Period6/14/116/16/11

Fingerprint

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

All Science Journal Classification (ASJC) codes

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

Cite this

Clarkson, C. R., Nobakht, M., Kaviani, D., & Ertekin, T. (2011). Production analysis of tight gas and shale gas reservoirs using the dynamic-slippage concept. In Society of Petroleum Engineers - SPE Americas Unconventional Gas Conference 2011, UGC 2011 (pp. 570-585)
Clarkson, C. R. ; Nobakht, M. ; Kaviani, D. ; Ertekin, Turgay. / Production analysis of tight gas and shale gas reservoirs using the dynamic-slippage concept. Society of Petroleum Engineers - SPE Americas Unconventional Gas Conference 2011, UGC 2011. 2011. pp. 570-585
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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.",
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Clarkson, CR, Nobakht, M, Kaviani, D & Ertekin, T 2011, Production analysis of tight gas and shale gas reservoirs using the dynamic-slippage concept. in Society of Petroleum Engineers - SPE Americas Unconventional Gas Conference 2011, UGC 2011. pp. 570-585, SPE Americas Unconventional Gas Conference 2011, UGC 2011, The Woodlands, TX, United States, 6/14/11.

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

Society of Petroleum Engineers - SPE Americas Unconventional Gas Conference 2011, UGC 2011. 2011. p. 570-585.

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

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N2 - 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.

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Clarkson CR, Nobakht M, Kaviani D, Ertekin T. Production analysis of tight gas and shale gas reservoirs using the dynamic-slippage concept. In Society of Petroleum Engineers - SPE Americas Unconventional Gas Conference 2011, UGC 2011. 2011. p. 570-585