Numerical investigation on a grouting mechanism with slurry-rock coupling and shear displacement in a single rough fracture

Mu, Wenqiang; Li, Lianchong; Yang, Tianhong; Yu, Guofeng; Han, Yunchun

doi:10.1007/s10064-019-01535-w

Cited by 76 publications

(24 citation statements)

References 35 publications

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“…Shale formations commonly consist of layered geological structures due to heterogeneous rock properties, in situ stress states, and interface properties [1][2][3][4]. Geological discontinuities in the vertical direction, such as weak interfaces and stress barriers, play a significant role in hydraulic fracture configuration, which is critical to the success of reservoir stimulation [5][6][7][8][9][10][11][12][13][14][15][16][17]. In this paper, if the Young's modulus, strength, or Poisson's ratio of the interlayer is larger than those of the adjacent oil-bearing layers, or the permeability of the interlayer is lower than that of the oil-bearing layers, the interlayer is called barrier, otherwise it is called weak layer.…”

Section: Introductionmentioning

confidence: 99%

The Influence of an Interlayer on Dual Hydraulic Fractures Propagation

Tang

Rutqvist

et al. 2020

Energies

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Multi-cluster hydraulic fracturing of long-range horizontal wells is an approach for enhancing the productivity of low-permeability shale reservoirs. In this study, RFPA-Petrol (rock failure process analysis on petroleum problems) is applied for modeling hydraulic fracture propagation in multilayered formations. RFPA-Petrol based on coupled hydraulic-mechanical-damage (HMD) modeling was first tested by modeling a laboratory scale experiment on a physical (cement) model with a single completion. The modeling demonstrated the capability of RFPA-Petrol for simulating hydraulic fracture propagation. Then, we used RFPA-Petrol to investigate how the difference in material properties between oil-bearing layers and interlayers and the fracturing fluid properties influence the propagation of dual fractures in multilayered laboratory-scale models. In this case, the models with geological discontinuities in the vertical direction are strongly heterogeneous and RFPA-Petrol simulations successfully modeled the fracture configurations.

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Section: Introductionmentioning

confidence: 99%

The Influence of an Interlayer on Dual Hydraulic Fractures Propagation

Tang

Rutqvist

et al. 2020

Energies

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“…Because the AE signals contain abundant information about crack changes, a number of studies have used AE to investigate the evolution law of crack and rock fracture patterns in Brazilian splitting tests, three-point bending, and compression [11][12][13][14][15][16][17][18][19]. It is found that there are inevitably subjectivity and uncertainty in the process of determining rock deformation by using the crack volume strain method [20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Defining Stress Thresholds of Granite Failure Process Based on Acoustic Emission Activity Parameters

Zhao

Deng

2020

Shock and Vibration

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In order to study the crack closure stress threshold σcc of hard rock, crack initiation stress threshold σci, stress threshold σcs of crack interaction, and damage stress threshold σc d, uniaxial compression test was carried out on granite samples. Stress sensor and dynamic strain gauge are used to measure the load, longitudinal, and lateral deformation of rock in real time. The acoustic emission characteristic parameters of rock fracture process are obtained by using the acoustic emission system. According to the change rule of the AE event rate, cumulative energy, energy rate, duration, and amplitude in the whole process of granite sample fracture, the stress threshold (σcc, σci, σcs, and σc d) of each loading stage in the process of rock sample fracture is obtained. The relationship between the stress threshold (σcc, σci, σcs, and σc d) of each stage and the uniaxial compressive strength σUCS of rock samples in the whole process of fracture is analyzed, which shows that the deformation characteristics and crack evolution law of the rock are unified. The research results can provide some reference for further understanding of rock damage evolution mechanism in engineering field.

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“…Regardless of the type of water inrush, the main causes [3] are the large deformation and failure of the surrounding rock of the mining voids. Rock fracturing is the dominant mechanism of failure, especially in intact rocks where explicit fracturing in the zones of geological structures or breakage of the roadway floor, rather than plastically deforming intact rock, are dominant [4]. Therefore, understanding the evolution processes and mechanisms of water inrush channels, controlled by fracture propagation, could be the key to preventing inrush events.…”

Section: Introductionmentioning

confidence: 99%

Modeling Rock Fracture Propagation and Water Inrush Mechanisms in Underground Coal Mine

Zhang

Shen

et al. 2019

Geofluids

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Water inrush in underground mines is a major safety threat for mining personnel, and it can also cause major damage to mining equipment and result in severe production losses. Water inrush can be attributed to the coalescence of rock fractures and the formation of water channel in rock mass due to the interaction of fractures, hydraulic flow, and stress field. Hence, predicting the fracturing process is the key for investigating the water inrush mechanisms for safe mining. A new coupling method is designed in FRACOD to investigate the mechanisms of water inrush disaster (known as “Luotuoshan accident”) which occurred in China in 2010 in which 32 people died. In order to investigate the evolution processes and mechanisms of water inrush accident in Luotuoshan coal mine, this study applies the recently developed fracture-hydraulic (F-H) flow coupling function to FRACOD and focuses on the rock fracturing processes in a karst collapse column which is a geologically altered zone linking several rock strata vertically formed by the long-term dissolution of the flowing groundwater. The numerical simulation of water inrush is conducted based on the actual geological conditions of Luotuoshan mining area, and various materials with actual geological characteristics were used to simulate the rocks surrounding the coal seam. The influences of several key factors, such as in situ stresses, fractures on the formation, and development of water inrush channels, are investigated. The results indicate that the water inrush source is the Ordovician limestone aquifer, which is connected by the karst collapse column to No. 16 coal seam; the fracturing zone that led to a water inrush occurs in front of the roadway excavation face where new fractures coalesced with the main fractured zone in the karst collapse column.

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Numerical investigation on a grouting mechanism with slurry-rock coupling and shear displacement in a single rough fracture

Cited by 76 publications

References 35 publications

The Influence of an Interlayer on Dual Hydraulic Fractures Propagation

The Influence of an Interlayer on Dual Hydraulic Fractures Propagation

Defining Stress Thresholds of Granite Failure Process Based on Acoustic Emission Activity Parameters

Modeling Rock Fracture Propagation and Water Inrush Mechanisms in Underground Coal Mine

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