The seepage mechanism and productivity model of shale gas reservoirs is the critical and scientific issue to develop the shale gas reservoirs effectively.The pore structures of shale possess the strong multi-scale characteristic,and complexity of seepage mechanisms.Knudsen diffusion,matrix deformation,stress sensitivity,non-Darcy flow and complex fracture network stimulated by hydraulic fracturing technology have certain effects on the multi-scale flow characteristic and productivity model. Firstly,this paper establishes a model of apparent permeability with the consideration of adsorption,diffusion,viscous flow,rock deformation,adsorption layer.On the basis of this proposed models,the influences of some related parameters,such as rock deformation,adsorption layer,on capillary radius and apparent permeability are analyzed.Secondly,for the different fracture pattern of multi-stage fractured horizontal well and volumetric fracturing horizontal well,with the consideration of gas adsorption,diffusion,matrix deformation,stress sensitivity and non-Darcy flow,two productivity prediction models are established based on the coupled hydraulic fractures and natural fractures.Finite difference method,Newton-Rapson iterative method and embed discrete fracture method are respectively employed to solve those two models.Finally,the orthogonal test design is employed to identify and analyze the dominated factors among the relevant parameters,such as fracture spacing,fracture half length,fracture numbers,fracture conductivity,permeability,and so on.The results can provide some certain guidance for the optimization of stimulated treatment in shale gas reservoirs.
Wang Yan-chen, Chen Jun, Deng Ya, Xiao Cong
. Seepage model of volume fracturing horizontal well in shale gas reservoir[J]. Natural Gas Geoscience, 2018
, 29(12)
: 1795
-1802
.
DOI: 10.11764/j.issn.1672-1926.2018.07.013
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