Study of the Dynamic Fracturing Process and Stress Shadowing Effect in Granite Sample with Two Holes Based on SCDA Fracturing Method

Wang, Luchao; Kang, Di; Zhang, Qiangyong; Li, Xuejian; Jiang, Rihua

doi:10.1007/s00603-021-02728-0

Cited by 19 publications

(7 citation statements)

References 38 publications

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“…Typically, the degree of fracture network development is positively correlated with the fractal dimensions of the hydraulic fractures. 38 The two-dimensional box-counting method was employed to calculate the fractal dimension, which is expressed as 39…”

Section: Fractal Description Of Hydraulic Fracturesmentioning

confidence: 99%

Hydraulic fracturing behavior of shale–sandstone interbedded structure under true triaxial stress conditions: A comprehensive experimental analysis

Sheng,

Yang,

Wang

et al. 2024

Fatigue Fract Eng Mat Struct

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Reservoirs characterized by shale–sandstone interbedded structures are extensively dispersed throughout China, and understanding the propagation mode of hydraulic fractures is a prerequisite for shale gas exploitation engineering. In this study, hydraulic fracturing tests were conducted using horizontal wells subjected to true triaxial compression conditions to elucidate the mechanism by which the initiated layer lithology and stress state influence the fracture morphology. Furthermore, the propagation mode of the fractures and the consequential effects on fracture network formation were investigated. The findings demonstrate four distinct interaction modes between the shale–sandstone interfaces and hydraulic fractures. The lithology of the initiated layer influences the fracture propagation trajectory, thereby affecting the propagation modes at the shale–sandstone interface and resulting in varying effects on layer penetration. The stress difference exerts a significant controlling influence on the fracturing behavior, enhancing the possibility of interconnecting multiple rock layers characterized by substantial stress differences.

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Section: Fractal Description Of Hydraulic Fracturesmentioning

confidence: 99%

Hydraulic fracturing behavior of shale–sandstone interbedded structure under true triaxial stress conditions: A comprehensive experimental analysis

Sheng,

Yang,

Wang

et al. 2024

Fatigue Fract Eng Mat Struct

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“…In the 1980s, researchers found that earlier formed hydraulic fractures can increase the stress of subsequent fractures, and that the geometry of the hydraulic fractures and the elastic effect of the pores can affect the growth of nearby hydraulic fractures (Adachi et al, 2007;Pan et al, 2014;Lecampion et al, 2018;Gao and Ghassemi, 2020a). Bunger et al (2011) further verified this phenomenon in their research of Barnet shale gas in 2010 and defined it as a stress shadow (Zhou et al, 2017;Ju et al, 2020;Wang et al, 2022;Bunger et al, 2011). With the innovation and progress of hydraulic fracturing methods, the stress shadow effect can be used to improve the effect of reservoir stimulation through zipper fracturing or simultaneous fracturing methods.…”

Section: Introductionmentioning

confidence: 96%

Proactive stress interference mechanism and its application in the Mahu oil area, Junggar basin

Wang

Li²,

Líu³

et al. 2022

Front. Earth Sci.

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There exists a large horizontal principal stress difference (11–38 MPa) in the tight conglomerates in the Mahu oil area, China. It is difficult to form a complex fracture network via hydraulic fracturing under these conditions. To improve reservoir stimulation, the fracture formation mechanism of the complex conglomerate fracture networks was explored. Based on the geomechanics theory of fracture formation, the mechanism of the “stress wall” formed by fracturing in horizontal wells was analyzed in this paper. The inhibitory effect of the stress wall on the formation of tensile and shear fractures was studied. The reason for the decrease in the stress difference coefficient caused by fracturing fluid was analyzed through numerical simulation, which suggested that the complexity of a fracturing network is mainly controlled by the interference of externally applied stress and the reduction in the coefficient of internal stress difference. In this paper, innovative technologies were developed by proactively introducing stress interference in the application of the Ma131 small-well-spacing pilot area. The core technologies include optimization of the 3-D staggered small-well-spacing pattern, and synergetic optimization of multiple elements and zipper fracturing. The positive effects of proactive stress interference on improving fracturing volume, reserve utilization rate and recovery were discussed. Based on the concept of proactive stress interference, the “serial fracturing mode” of horizontal wells was proposed to reduce drilling and fracturing interference and improve the development effect.

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“…The underground environment of most coal mines, except open-pit ones, is complex and diverse due to the coupling of multiple thermos-mechanical fields and factors (Neil et al, 2021;Wang et al, 2011Wang et al, , 2021bWang et al, , 2022Zhang and Li, 2022). However, with gradual exhaustion of easily mined coal resources, coal mining under complex conditions became more and more topical.…”

Section: Introductionmentioning

confidence: 99%

Water-bearing effect on mechanical properties and interface failure mode of coal–rock combination samples

Zhang

Chi

Yang³

et al. 2023

Energy Exploration & Exploitation

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The coal and rock mass in water-rich mines with underground waterproof coal-and-rock pillars will be inevitably eroded by groundwater. The mechanical properties and interface failure mode of coal–rock mass under high-moisture conditions directly affect the mine stability and operation safety. This study performed uniaxial compression tests of samples from coal, rock, and their combination with different water contents, the evolution law of mechanical properties and acoustic emission (AE) damage characteristics of coal–rock combinations (C-RC) with different water contents were studied. The C-RC interface failure modes at different water contents were clarified. The results showed that the deterioration of average peak strength of coal, rock, and C-RC was obvious with increased water content. The deterioration degree in the descending order was as follows: C-RC > coal mass > rock mass. The maximum AE ringing number first increased rapidly and then sharply dropped, while the AE cumulative ringing number dropped slowly and then rapidly, reflecting the internal crack propagation patterns in C-RC. The failure mechanism of water-bearing C-RC was related to coal–rock strength ratio and the water-bearing effect of coal–rock interface. When the water-bearing state of C-RC changed from dry to saturated, the macro-failure mode showed the law of only coal fracture (0%)—minor fracture at the coal–rock interface (4%)—both coal and rock fracture (8%)—only coal fracture (12%). With increased water content, the water-bearing effect of C-RC interface gradually prevailed in the C-RC failure pattern.

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Study of the Dynamic Fracturing Process and Stress Shadowing Effect in Granite Sample with Two Holes Based on SCDA Fracturing Method

Cited by 19 publications

References 38 publications

Hydraulic fracturing behavior of shale–sandstone interbedded structure under true triaxial stress conditions: A comprehensive experimental analysis

Hydraulic fracturing behavior of shale–sandstone interbedded structure under true triaxial stress conditions: A comprehensive experimental analysis

Proactive stress interference mechanism and its application in the Mahu oil area, Junggar basin

Water-bearing effect on mechanical properties and interface failure mode of coal–rock combination samples

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