, 44:43 | Cite as

Crack initiation and propagation in coalbed gas reservoir during hydraulic fracturing

  • Tingting Jiang
  • Haiwang YeEmail author
  • Gaofeng RenEmail author
  • Jianhua Zhang
  • Yubiao LiEmail author
  • Junwei Wang
  • Hao Wu
  • Chunyang Zhang
  • Gang Huang
  • Bo Ke
  • Wei Liu


The crack initiation and propagation calculation model during hydraulic fracturing in a coalbed methane reservoir with interlayers is established in this paper. The influence of coal elasticity modulus and fracturing fluid displacement on the fracture geometry are studied. Results show that the fracture initiation begins at the perforation interval. Stress inhomogeneity is detrimental for the formation of multiple cracks for the extension of the fracturing area. The cracks at the boundary have changed from less developed to more developed with increasing horizontal stress coefficient. The coal elasticity modulus and fracturing fluid displacement both play a determinative effect on fracture geometry. The study provides a reference basis for implementing hydraulic fracturing of low permeability coal seams with interlayers.


Crack coalbed gas reservoir interlayer stress concentration numerical analysis 



coalbed methane


flow rate along x direction


flow rate along z direction


fracturing fluid viscosity


volume flow rate per unit length along x direction


fracturing fluid flow at one side


fracturing fluid displacement


maximum fracture height


fracture width


maximum fracture width


half-fracture length


fracture plane pressure


initial injection pressure


normal closure pressure


effective stress of new fracture tip


minimum horizontal principal stress


maximum horizontal principal stress


hydraulic fracturing pressure


tensile strength of coal


pressure drop of the fracturing fluid


included angle between hydraulic fracture and natural fracture



This work was supported by the National Natural Science Foundation of China (Grant No. 51804236), the National Key Research and Development Program of China (Grant No. 2017YFE0109500), the National Key Research and Development Plan (Grant No. 2018YFC0808400), the National Natural Science Foundation of China (Grant No. 51774220), the National Key Research and Development Plan (Grant No. 2018YFC0808405).


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Copyright information

© Indian Academy of Sciences 2019

Authors and Affiliations

  1. 1.Hubei Province Key Laboratory of Processing of Mineral Resources and Environment, School of Resource and Environmental EngineeringWuhan University of TechnologyWuhanPeople’s Republic of China
  2. 2.Nanjing Tianyin Senior High SchoolNanjingPeople’s Republic of China
  3. 3.College of Urban and Environmental ScienceCentral China Normal UniversityWuhanPeople’s Republic of China
  4. 4.College of Resources and Environmental ScienceChongqing UniversityChongqingPeople’s Republic of China

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