The distinct element analysis for hydraulic fracturing in hard rock considering fluid viscosity and particle size distribution

Shimizu, Hiroyuki; Murata, Sumihiko; Ishida, Tsuyoshi

doi:10.1016/j.ijrmms.2011.04.013

Cited by 332 publications

(160 citation statements)

References 24 publications

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“…Therefore, enhancing the permeability and desorption rate of coal are critical for improvement of CSG extraction amount (Gandossi 2013;Li et al, 2015). Many methods such as hydraulic fracturing, high-pressure water jet and blasting vibration (Shen et al, 2012;Li et al, 2009;Shimizu et al, 2011;Li and Xing 2015), have been tested and applied to achieve these goals. The desorption rate and permeability of CSG can also be significantly increased by physical stimulation through changing the thermal field, stress field, electrical and magnetic field (Pan et al, 2012;Azmi et al, 2006;Hol et al, 2011;Charriére et al,2010;Liu et al, 2006) and their coupling effects.…”

Section: Introductionmentioning

confidence: 99%

Numerical modelling of acoustic stimulation induced mechanical vibration enhancing coal permeability

Jiang

Xing

2016

Journal of Natural Gas Science and Engineering

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Mechanical vibration is a major effect generated by acoustic stimulation inside a coal sample for enhancing its permeability. The numerical simulation based on the staggered-grid finite differential method (FDM) is applied to simulate 3D wave propagation in a fractured coal. Two parameters, shear wave energy (SE) and variable width of cleat (DW), are introduced and implemented in the numerical model to explicitly visualise and evaluate the acoustic stimulation effects. The polarized wave induced wave dynamics in a coal sample with a cleat/fracture is numerically simulated and analysed. Especially, the energy trapping and dynamic variation of fracture width in coal for the cleat/fracture with three different filled media (i.e. air, water and weak mineral) are numerically analysed and compared with each other subjected to different incident wave angles, and the optimal stimulation parameters are obtained through such sensitivity analysis. Simulation results show that the coal property (i.e. cleat and its filled media) and incident wave angles are crucial for acoustic stimulation to produce physical damages around coal cleats and enhance the permeability of fractured coal samples.

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Section: Introductionmentioning

confidence: 99%

Numerical modelling of acoustic stimulation induced mechanical vibration enhancing coal permeability

Jiang

Xing

2016

Journal of Natural Gas Science and Engineering

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“…Through comparison with results of the geometry of hydraulic fractures from laboratory experiments and field observations of microseismic locations, magnitudes and source mechanisms, Zhao and Young (2011) validated the PFC 2D discrete element approach for modelling hydraulic fracturing. Shimizu et al (2011) conducted a series of hydraulic fracturing simulations in competent rock by using flow-mechanically coupled PFC 2D code, and investigated the influence of the particle size distribution and fluid viscosity. There results show that in hydraulic fracturing processes the generation of tensile cracks is dominating, while the energy from shear type acoustic emission is larger than from the tensile type.…”

Section: Introductionmentioning

confidence: 99%

Hydraulic fracturing process by using a modified two-dimensional particle flow code - method and validation

Zhou

Zhang

Han

2017

PCFD

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Hydraulic fracturing had been proved as a very useful tool for unconventional oil and gas development, where the fracturing fluid is injected into tight reservoirs under high pressure to enhance the permeability of rock mass. Although hydraulic fracturing theory, numerical modelling, and laboratory experiments develops fast, knowledge is still limited when the geological conditions are complex. This paper presents a numerical method -particle flow code (PFC) -and validates its power for hydraulic fracturing modelling in complex conditions. Firstly, the bonded particle method (BPM) and fluid-mechanical coupling mechanism are introduced; secondly, Darcy's flow in circular particles is simulated; thirdly, a series of numerical simulations is carried out to validate its suitability for hydraulic fracturing modelling; finally, the laminated reservoir will be modelled by BPM. The modelling results show good agreement with classical analytical solution and laboratory test results, which demonstrates that the BPM is a useful and strong tool for understanding the fracturing behaviour of reservoir rocks.Keywords: bonded particle model; modified fluid-mechanical couple mechanism; Darcy's flow; hydraulic fracturing; validation of pressure breakdown simulation.Reference to this paper should be made as follows: Zhou, J., Zhang, L. and Han, Z. (2017) 'Hydraulic fracturing process by using a modified two-dimensional particle flow code -method and validation

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“…Through comparisons with results of the geometry of hydraulic fractures from laboratory experiments and field observations of micro-seismic locations, magnitudes and source mechanisms, Zhao and Young (2011) validated the PFC 2D code for modelling hydraulic fracturing. Shimizu et al (2011) conducted a series of hydraulic fracturing simulations in competent rock by using flow-mechanically coupled PFC 2D code, and investigated the influence of the fluid viscosity and particle size distribution.…”

Section: Introductionmentioning

confidence: 99%

Hydraulic fracturing process by using a modified two-dimensional particle flow code - case study

Zhang

Zhou

Han

2017

PCFD

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By using a modified PFC 2D model, the authors conducted a series of simulations to examine the influences of in-situ stress ratio, fluid injection rate, anisotropy of laminated rocks, and perforation parameters on hydraulic fracturing process. The simulations indicated that: 1) larger in-situ stress ratio will induce smaller breakdown pressures and faster propagation, and hydraulic fractures will extend along the direction of the maximum principal stress or approach to this preferred path; 2) smaller difference of in-situ stresses or faster fluid injection rate is helpful for creation of complex fracture network; 3) weak layers are preferred locations and directions for fracture initiation and propagation in the laminated rocks; 4) hydraulic fractures initiate easily at the bottoms of perforation channels, and propagate generally along or approaching to the direction of maximum principal stress.Keywords: a modified PFC 2D model; isotropic medium; the laminated rock; in-situ stress ratio; fluid injection rate; dip angle of bedding planes.Reference to this paper should be made as follows: Zhang, L., Zhou, J. and Han, Z. (2017) 'Hydraulic fracturing process by using a modified two-dimensional particle flow code -case study

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The distinct element analysis for hydraulic fracturing in hard rock considering fluid viscosity and particle size distribution

Cited by 332 publications

References 24 publications

Numerical modelling of acoustic stimulation induced mechanical vibration enhancing coal permeability

Numerical modelling of acoustic stimulation induced mechanical vibration enhancing coal permeability

Hydraulic fracturing process by using a modified two-dimensional particle flow code - method and validation

Hydraulic fracturing process by using a modified two-dimensional particle flow code - case study

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