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Song, Shaoxian
- Effects of Bedding on Hydraulic Fracturing in Coalbed Methane Reservoirs
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PDF Views:131
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
References
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- Study on Flow Behaviour in the Short-Throat-Jet Type Flotation Machine
Abstract Views :401 |
PDF Views:131
Authors
Affiliations
1 School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan, 232001, CN
2 Surface chemistry lab, Instituto de Metalurgia, Universidad Autonoma de San Luis Potosi, Av. Sierra Leona 550, San Luis Potosi, SLP 78210, MX
3 School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, 430000, CN
1 School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan, 232001, CN
2 Surface chemistry lab, Instituto de Metalurgia, Universidad Autonoma de San Luis Potosi, Av. Sierra Leona 550, San Luis Potosi, SLP 78210, MX
3 School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, 430000, CN
Source
Current Science, Vol 116, No 4 (2019), Pagination: 592-596Abstract
A two-dimensional model of the short-throat-jet flotation machine was developed for studying the flow behaviour and some difficult to measure parameters in the device using computational fluid dynamics (CFD). A laboratorial model was established for verifying the dependability of CFD, while a good agreement between measurement results and simulation was presented. With the inlet pressure set as 0.015 MPa, the minimum pressure close to the wall of the inhale section was obtained as 1200 Pa at Y = 164.2 mm, which was the optimal position for inhaling air. Moreover, the maximum pressure at the cell bottom was about 44,600 Pa at X = 15 mm from the centre of the jet, which was useful in selecting a suitable material to build the cell bottom. Analysis of wall shear stress showed that the wall shear stress on the right side of the jet was larger than that on the left side. Closer to the jet nozzle, the shear stress was larger. The wall shear stress on the right side of the short throat was likewise found to be larger than that on the left side, maximum difference being 140 Pa at Y = 115.5 mm. Analysis of the velocity field showed that the velocity decreased by 50% from the inlet to the outlet of the throat, and seven obvious vortexes were found to exist in the cell, where two of them in the inhale section were advantageous for inhaling air.Keywords
Flotation Machine, Pressure, Velocity, Vortex, Wall Shear Stress.Full Text
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