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, 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
Article
  • 12 Downloads

Abstract

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.

Keywords

Crack coalbed gas reservoir interlayer stress concentration numerical analysis 

Nomenclature

CBM

coalbed methane

ux

flow rate along x direction

uz

flow rate along z direction

u

fracturing fluid viscosity

qx

volume flow rate per unit length along x direction

q

fracturing fluid flow at one side

qi

fracturing fluid displacement

hf

maximum fracture height

w

fracture width

w0

maximum fracture width

L

half-fracture length

P

fracture plane pressure

p0

initial injection pressure

σn

normal closure pressure

σteff

effective stress of new fracture tip

σH,min

minimum horizontal principal stress

σH,max

maximum horizontal principal stress

Pfrac

hydraulic fracturing pressure

σt

tensile strength of coal

△p

pressure drop of the fracturing fluid

θ

included angle between hydraulic fracture and natural fracture

Notes

Acknowledgements

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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