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Zhang, Jianhua
- Impact Analysis of Multiple Parameters on Fracture formation during Volume Fracturing in Coalbed Methane Reservoirs
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PDF Views:86
Authors
Affiliations
1 Hubei Province Key Laboratory of Processing of Mineral Sources and Environment, School of Resource and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, CN
1 Hubei Province Key Laboratory of Processing of Mineral Sources and Environment, School of Resource and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, CN
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Current Science, Vol 112, No 02 (2017), Pagination: 332-347Abstract
Uniaxial and triaxial compression, Brazilian splitting and three-point bending tests have been carried out to determine the mechanical parameters of the coal reservoir in Jiaozuo coal mining district, Henan Province, China. Based on the experimental results and combined with the target reservoir geological characteristics, a 3D geological mechanical model has been established to analyse the hydraulic fracture propagation during volume fracturing using MEYER software. Effects of the modulus of coal rock, difference between horizontal principal stresses, fracturing fluid viscosity and fracturing fluid injection rate on the fracturing network geometry are studied. Results show that fracturing network development intensity in the coalbed methane (CBM) reservoir is determined both by the geological conditions and the hydraulic fracturing parameters. The intensity of fracturing in the CBM reservoir is positively related with the elastic modulus of the coal rock, and is inversely proportional to the difference between the two horizontal principal stresses. Increasing fluid viscosity reduces the fracturing area. Low injection rate is beneficial to improving hydraulic treatment areas when it is larger than that required to guarantee that the crack extends. The results can provide a case reference for optimization design of volume fracturing and productivity prediction analysis of CBM reservoirs.Keywords
Coalbed Methane Reservoir, Fracture Network, Numerical Simulation, Volume Fracturing.Full Text
- Effects of Bedding on Hydraulic Fracturing in Coalbed Methane Reservoirs
Abstract Views :226 |
PDF Views:85
Authors
Affiliations
1 Hubei Province Key Laboratory of Processing of Mineral Resources and Environment, School of Resource and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, CN
1 Hubei Province Key Laboratory of Processing of Mineral Resources and Environment, School of Resource and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, CN
Source
Current Science, Vol 113, No 06 (2017), Pagination: 1153-1159Abstract
Bedding is a special structure of coal, which has notable effects on the mechanical parameters of coal and on the hydraulic fracture propagating in coal bed methane reservoirs. To study the effects of bedding onanisotropic characteristics of coal fracture toughness,three-point bending tests have been carried out on raw coal specimens. The results indicate that fracture toughness and failure modes of the specimens both have strong anisotropy due to bedding. A geological geomechanical model of a coal bed methane (CBM)reservoir is built taking into account the effect of bedding to study the hydraulic fracture propagation and the influence of bedding on the fracture network. The hydraulic fracture initiates at the end of the perforation and tends to bifurcate and swerve at the bedding to produce induced fractures. Ultimately, these fractures form a complicated fracture network. The fracture toughness of bedding has great influence on hydraulic fracture geometry. The fracture is likely to bifurcate and swerve at the bedding to form multiple secondary fractures with larger bedding fracture toughness.Keywords
Coalbed Methane, Coal Seam, Fracture Toughness, Hydraulic Fracturing, Numerical Simulation, Three Point Bending Test.Full Text
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