Pressure dynamic analysis model of MFHW in induced permeability field
Received date: 2016-10-31
Revised date: 2017-02-22
Online published: 2017-05-10
Volume fracturing is the key technique in development of tight or shale gas reservoirs.Well test interpretation is lack of research on induced permeability field with stronger heterogeneity.Considering fracturing treatment inducing a permeability alteration around the hydraulic fracture,an induced-permeability-field model on the hypothesis that induced permeability field can be properly represented by a linear or exponential function and incorporate the monotonic decrease or increase of permeability enhancement as the distance to the hydraulic fracture increases,which is coupled to flow field model.Combined withlinear flow,the seepage model for multi-fractured horizontal well with finite conductivity in the induced permeability field has been built.By multiple variable substitutions,Bessel function and GWR numerical inversion,pressure solution has been obtained.Influence of characteristic parameters,such as distribution of induced permeability,on the pressure performance is analyzed.Existence of induced permeability field will result in early appearance of boundary response or flat transition region.Combined with the field case,the pressure buildup curve fitting in two permeability fields has been finished.Compared with the interpretation result,the reason for the existence of abnormal stage has been introduced in the new model.By curve fitting,the more reasonable parameters in SRV can be obtained.
Wang Yan-yan,Wang Wei-hong,Hu Xiao-hu,Liu Hua,Guo Yan-dong . Pressure dynamic analysis model of MFHW in induced permeability field[J]. Natural Gas Geoscience, 2017 , 28(5) : 785 -791 . DOI: 10.11764/j.issn.1672-1926.2017.02.002
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