LITHOLOGIC RESERVOIRS ›› 2015, Vol. 27 ›› Issue (4): 109-112.doi: 10.3969/j.issn.1673-8926.2015.04.016

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Apparent permeability model of shale gas considering stress sensitivity and adsorption

Guo Xiao1, Ren Ying1, Wu Hongqin2   

  1.  1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation , Southwest Petroleum University ,Chengdu 610500 , China ; 2. Research Institute of Drilling Engineering , Sinopec Southwest Petroleum Engineering Company , Deyang 618000 , Sichuan , China
  • Online:2015-07-20 Published:2015-07-20

Abstract:

Multi-scale flow is observed obviously in the shale gas reservoir, and stress sensitivity and adsorption also make the flow mechanism of shale gas more complex. A corrected apparent permeability model considering the two factors is derived based on the Beskok-Karniandakis model. The effects of stress sensitivity and adsorption on shale gas apparent permeability were analyzed by using the new model. The following results were achieved in the calculation and analyses of the model: when the pore radius is over 5 nm, the apparent permeability declines and then goes up with the pressure drops down under the influence of the stress sensitivity together with the adsorption; when the pore radius is less than 5 nm, the permeability loss caused by the stress sensitivity is less than the permeability increase created by adsorption and slippage, thus the apparent permeability presents an upward trend with the pressure drops down.

Key words: tightreservoir, high-quality reservoirs, genetic mechanism, dolomitization, BZ-A-1 well field, Huanghekou Sag

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