Analysis of Gas Flow Behavior in Nano-scale Shale Gas Reservoir

doi:10.11885/j.issn.1674-5086.2014.01.07.06

Abstract

Abstract:

Shale gas reservoir theory and field practices showed that the actual yield is higher than the predicted production
of traditional seepage flow model，and that classic Darcy percolation law cannot fully describe the shale gas flow behavior
of the shale media. Thus a calculation model for accurate description and calculation of gas flow of shale media needs to be
established. Existing shale gas reservoir seepage flow models are the correction to traditional viscous flow by simply attached
molecular flow，which ignored the middle flow state of the molecular flow and viscous flow，especially for characterization
of transition flow. This paper considers different complex flow pattern in shale media to established gas flow analysis model
of describing the shale reservoir. The calculation results show that the smaller the porosity of shale reservoir is，the smaller
the gas molecular molar mass is and the lower formation pressure could be，the easier gas flow shows the micro flow regime，
and the greater the ratio of the apparent permeability to Darcy permeability is. The model reveals the essential reason why the
shale reservoir actual yield is higher than predicted yield of Darcy model，and the research has significant guiding importance
to direct shale gas reservoir production.

Key words: nanometer, apparent permeability, nanopores, hydraulic fracturing, viscous flow, molecular flow, transition flow

Ren Lan, Shu Liang, Hu Yongquan, Zhao Jinzhou. Analysis of Gas Flow Behavior in Nano-scale Shale Gas Reservoir[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2014.01.07.06.

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