Predicting hydraulic fracture propagation based on maximum energy release rate theory with consideration of T-stress

Li, Xiaoxuan; Liang, Yunpei; Luo, Yongjiang; Ai, Chi

doi:10.1016/j.fuel.2020.117337

Cited by 24 publications

(4 citation statements)

References 31 publications

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“…Most existing studies have reported that interactions of hydraulic fractures with discontinuities are largely controlled by the in situ stress, and the geometry and strengths of the discontinuity. Using these parameters, studies have formulated criteria for fracture penetration/deflection in terms of the stress (Blanton, 1982; Chuprakov et al., 2014; Fu et al., 2018; Gu et al., 2012; S. Li et al., 2017; Renshaw & Pollard, 1995; Warpinski & Teufel, 1987) or the energy (Dahi‐Taleghani & Olson, 2014; X. Li et al., 2020; Zeng & Wei, 2017). These studies have established that a fracture is more likely to deflect at a discontinuity if either of these decreases: (a) the approaching angle to the interface, (b) the interface strength, or (c) the differential stress.…”

Section: Introductionmentioning

confidence: 99%

“…Li et al, 2017;Renshaw & Pollard, 1995;Warpinski & Teufel, 1987) or the energy (Dahi-Taleghani & Olson, 2014; X. Li et al, 2020;Zeng & Wei, 2017). These studies have established that a fracture is more likely to deflect at a discontinuity if either of these decreases: (a) the approaching angle to the interface, (b) the interface strength, or (c) the differential stress.…”

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confidence: 99%

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Interactions of Hydraulic Fractures With Grain Boundary Discontinuities in the Near Wellbore Region

et al. 2023

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The propagation direction of hydraulically induced fracture was contested at some point (Harrison et al., 1954;Reynolds et al., 1961) whether it is horizontal along a bedding plane lifting the overburden (Howard & Fast, 1950) or orthogonal to the minimum principal stress (Hubbert & Willis, 1957). However, a number of theoretical analyses and experiments demonstrated that the plane of hydraulic fracture propagation is orthogonal to the minimum principal stress (Harrison et al., 1954; Hubbert & Willis, 1957). Based on this notion, hydraulic fracturing has become an established means to estimate the minimum principal stress as the fracture planes open against the minimum principal stress (

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Section: Introductionmentioning

confidence: 99%

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Interactions of Hydraulic Fractures With Grain Boundary Discontinuities in the Near Wellbore Region

et al. 2023

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“…Based on the fracture criterion of Hubbert and Willis, Huang et al 10 deduced the relationship between the hydraulic fracturing stress of inclined wellbore and the in situ stress of rock strata according to the maximum tensile stress theory. Based on the theory of maximum energy release rate, Li 11 established hydraulic fracture propagation criteria, analyzed the influence of natural fractures on hydraulic fracture propagation, and found that the larger the stress difference between the rock layer and the approaching Angle of hydraulic fracture, the easier the hydraulic fracture will pass through the natural fracture.…”

Section: Introductionmentioning

confidence: 99%

Prevention and Control of Coal and Gas Outburst by Directional Hydraulic Fracturing through Seams and Its Application

Li,

Zhou,

Hao

et al. 2023

ACS Omega

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The regionalized pressure relief, permeability enhancement, and outburst prevention of "three high and one low" coal seams with high gas, high ground stress, high outburst risk, and low permeability have become important problems to be solved urgently in realizing the sustainable development of coal mines. In this study, a combination of theoretical research, RFPA 2D -Flow numerical simulation, and field test was used to study the initiation mechanism and propagation law of directional hydraulic fracturing fractures through the seam. The results show that fracture initiation depends on the axial and radial horizontal stress of the fracture hole, the physical and mechanical properties of coal and rock, and the inside of the weakest layer. Single-hole hydraulic fracturing can achieve a pressure relief radius of 7−8 m, but there is a stress concentration zone outside, which is not conducive to regional pressure relief and permeability enhancement. Directional hydraulic fracturing with multiple holes produces an approximate cylindrical compression and crushing ring and a penetrating fracture surface along the center line of the pressure crack hole and the directional hole, which better eliminates the phenomenon of stress concentration in nondirectional hydraulic fracturing. The technology was applied to the 2238 auxiliary roadway of Chengzhuang Mine of Jinmei Group, and the field implementation results showed that field implementation results showed that directional hydraulic fracturing through the seam reduced the gas content in the coal seam to a great extent, and the coal seam gas content was reduced by about 42.3%, indicating that the technology can effectively reduce the risk of coal and gas outbursts.

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“…Zhou et al and Zheng et al [25,26] proposed H factor to evaluate the combined effect of in situ stress, injection pressure, and perforation angle; however, they did not make a parallel comparison of the influence of each factor. Meanwhile, various damage criteria have been used in simulation model, such as energy release rate criterion [27], maximum circumferential stress criterion [28], and minimum strain energy density criterion [29]. Physically, the maximum energy release rate is the most acceptable.…”

Section: Introductionmentioning

confidence: 99%

Factors Controlling the Hydraulic Fracture Trajectory in Unconventional Reservoirs

et al. 2022

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The morphology of hydraulic fracture is affected by many factors. In previous studies, due to the heterogeneity of rock samples and the limitations of sample size, influence degree of various factors on fracture deflection angle has not been well distinguished in laboratory experiments. Based on the boundary element method, we established a mathematical model to study the factors controlling the morphology of hydraulic fracture. Simulation results show that with increasing injection pressure, the radius of the fracture curvature increases. When the difference between the injection pressure and the maximum principal stress is 5 times the ground stress difference, the influence of in situ stress on hydraulic fracture deflection can be ignored. Hydraulic fracture deflection angle was relatively larger when considering the viscosity of the fracturing fluid. When stress difference is too small or the injection pressure is too big, the deflection angle of fracture is easy to fluctuate during initial propagation. Too large Young’s modulus and too small Poisson’s ratio will inhibit the fracture deflection and cause a narrower width of fracture. The effect of Poisson’s ratio on fracture aperture is less than 1 mm. When perforation angle is perpendicular to maximum horizontal principal stress, the fracture width first increases rapidly and then gradually decreases from heel to tip. The influence degree of each factor on fracture deflection is ranked: stress difference of in-situ stress is the biggest, followed by injection pressure and perforation angle. This study is of great significance for the control of hydraulic fracture morphology and the further improvement of fracturing effect.

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Predicting hydraulic fracture propagation based on maximum energy release rate theory with consideration of T-stress

Cited by 24 publications

References 31 publications

Interactions of Hydraulic Fractures With Grain Boundary Discontinuities in the Near Wellbore Region

Interactions of Hydraulic Fractures With Grain Boundary Discontinuities in the Near Wellbore Region

Prevention and Control of Coal and Gas Outburst by Directional Hydraulic Fracturing through Seams and Its Application

Factors Controlling the Hydraulic Fracture Trajectory in Unconventional Reservoirs

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