Calculation Model of Hydro-mechanical Coupling for Dynamic Width of Deformable Natural Fracture

doi:10.11885/j.issn.1674-5086.2020.10.28.02

Abstract

Abstract: Aiming at the fact that existing models for calculating the dynamic width of natural fractures fail to consider the compression deformation of the fracture under the net flow pressure in the fracture,the model of hydro-mechanical coupling for dynamic width of natural fracture is studied.Firstly,according to the deformation law of natural fracture wall and the net flow pressure equation in the fracture,a hydro-mechanical coupling leakage dynamic model is established,by which the geometric control equations of the leakage rate and the invasion velocity of the leakage front distance are obtained;then,the self-adaptive search method is used to calculate the equivalent average width of the natural fracture,and the initial width of the natural fracture is obtained based on the volume equivalent principle.The solution method of the natural fracture shape coefficient is established by combining the geometric control equations of leakage rate and the initial width;finally,according to the geometric governing equation of the invasion velocity of the leakage front distance,the natural fracture shape constraint is solved to obtain the normal stiffness,and then the model of hydro-mechanical coupling for dynamic width of natural fracture is obtained.The model of hydro-mechanical coupling for dynamic width of natural fracture has been verified on-site and the calculation results are in good agreement with the on-site measured data.Only the drilling fluid performance,the lost circulation rate sequence and the lost volume sequence measured on-site are needed to predict the dynamic width of natural fractures,which is convenient for on-site application.

Key words: fracture leakage;deformable natural fracture;hydro-mechanical coupling;dynamic width;calculation model

CLC Number:

TE245

PENG Hao, LI Qian, GAO Jiajia, YIN Hu, CHEN Yifan. Calculation Model of Hydro-mechanical Coupling for Dynamic Width of Deformable Natural Fracture[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(2): 77-86.

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