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Relationship between elastic mechanical properties and equivalent  fracture pressure of coal reservoir near wellbore

Chen Li-chao1,2,Wang Sheng-wei2,3   

  1. 1.School of Mining and Technology in Inner Mongolia University of Technology,Hohhot 010051,China;
    2.State Key Laboratory of Coal and CBM Co-mining in Jincheng Anthracite Mining Group,Jincheng 048204,China;
    3.Faculty of Earth Resources in China University of Geosciences,Wuhan 430074,China

  • Received:2018-10-30 Revised:2018-11-28 Online:2019-04-10

Abstract: The elastic mechanical property of rock is a mechanical constraint for the fracture initiation in hydraulic fracturing.51 coalbed methane wells in Zhengzhuang blocks of Qinshui Basin are taken as the object in this paper,the parameters of elasticity mechanics (Young’s modulus E,shear modulus G,bulk modulus K,Poisson’s ratio v) of No.3 coal near wellbore were calculated based on the acoustic,density logging data,and meanwhile the values of equivalent fracture pressure (Pt) which represent energy consumption were figured out.Based on regression,two patterns of relationship between the elastic mechanical parameters (E,G,K) and Pt were proposed.In soft coal with medium and low modulus,there is a positive correlation between them,for high-modulus hard coal,Pt is low when the coal develops natural fracture and Pt increases with the decrease of parameters (E,G,K) with the blockage effect of coal fines,whereas Pt increases rapidly with the increase of parameters (E,G,K) when the coal is stiffness.The relationship between v and Pt in coal is inversely related to above.Pt increases rapidly with the increase of v in high modulus hard coal,while in medium and low modulus soft coal Pt increases with the decrease of  v firstly by the extrusion effect of pore water in coal,and then it is positively correlated with v.

Key words: Coal reservoir, Elastic mechanical properties, Equivalent fracture pressure, Hydraulic fracturing, Fracture initiation mechanism, Zhengzhuang block, Qinshui Basin

CLC Number: 

  • TE312
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