Pressure Transient Analysis of Fractured Horizontal Well in Composite Shale Gas Reservoir
Received date: 2015-02-01
Revised date: 2015-04-04
Online published: 2015-12-10
As a significant index to evaluate the development of shale gas reservoirs,stimulated reservoir volume(SRV)has a great impact on pressure responses.We present a composite reservoir model where inner region and outer region are both regarded as dual porosity media to take into account of the effect of SRV.Multiple migration mechanisms of shale gas were also considered including desorption,diffusion and seepage.Line source function,Laplace transformation and the principle of superposition were used to obtain pressure responses of fractured horizontal well in composite shale gas reservoirs.Then the impact of wellbore storage and skin factor were considered by the Duhamel principle.Applying Stehfest numerical inversion algorithm,the bottom-hole pressure in real time domain can be calculated.Type curves were plotted and different flow regimes were identified.The effects of SRV radius,fracture number,fracture half length,facture spacing,diffusion coefficient,storability coefficient,adsorption index,permeability coefficient and mobility ratio on pressure responses were investigated.This model is more comprehensive and the results can provide more accurate instructions for economic reservoir development.
JIANG Rui-zhong，TENG Wen-chao，QIAO Xin，XU Jian-chun，SUN Zhao-bo，GAO Yi-hua，FAN Haijun . Pressure Transient Analysis of Fractured Horizontal Well in Composite Shale Gas Reservoir[J]. Natural Gas Geoscience, 2015 , 26(12) : 2336 -2342 . DOI: 10.11764/j.issn.1672-1926.2015.12.2336
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