Laboratory investigation of hydraulic fracture propagation using real-time ultrasonic measurement in shale formations with random natural fractures

Wang, Y.; Li, C. H.; Hu, Yanqiang; Mao, Tianqiao

doi:10.1007/s12665-017-7038-2

Cited by 15 publications

(8 citation statements)

References 33 publications

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“…In contrast, the stress did not vary much with the increase in the primary transverse fracture propagation on the plane perpendicular to the minimum principal stress. The hydrofracturing crack propagated perpendicular to the minimum principal stress plane, and not along the direction of the shear stress, which in agreement with Wang et al 38 It avoided the continuous propagation of shear crack along shear stress and prevented shear failure. Therefore, near-wellbore complex fractures initiated with injection pressure increased, which was in agreement with the variation in cumulative AE count shown in Figure 4.…”

Section: Discussionsupporting

confidence: 88%

“…However, the relationship between hydraulic activity and short‐term failure mechanism is still poorly understood . The risk of earthquakes triggered by hydraulic fractures is closely related to the stress state of rock strata and the development of fractures . It determines whether to initiate new tensile fractures or the propagation of preexisting fractures dominates the failure .…”

Section: Introductionmentioning

confidence: 99%

“…[35][36][37] The risk of earthquakes triggered by hydraulic fractures is closely related to the stress state of rock strata and the development of fractures. 38,39 It determines whether to initiate new tensile fractures or the propagation of preexisting fractures dominates the failure. 8,22,[40][41][42][43] Wang and Li et al 38 found that hydraulic fractures interacted with random microfractures will make the complex geometry.…”

Section: Introductionmentioning

confidence: 99%

“…38,39 It determines whether to initiate new tensile fractures or the propagation of preexisting fractures dominates the failure. 8,22,[40][41][42][43] Wang and Li et al 38 found that hydraulic fractures interacted with random microfractures will make the complex geometry. Li et al 42 investigated the hydraulic fracturing process of granite with different orientations of two precut flaws by analyzing the acoustic emissions data.…”

Section: Introductionmentioning

confidence: 99%

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Short‐term failure mechanism triggered by hydraulic fracturing

Wang

Liu

2019

Energy Science & Engineering

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Hydraulic fracturing may induce or trigger an earthquake while injecting fluid into strata to initiate a new fracture so as to promote oil and gas production. Previous studies have confirmed that the injection of fluids into the formation, especially hydraulic fracturing, is closely related to seismic activity. However, the mechanism through which fluid injection changes the stress field of rock mass and interacts with the in situ stress state is still poorly understood. This study focused on the short‐term mechanism coupling shear stress and hydraulic fracturing in an experimental simulation. Preexisting tension fractures were initiated and propagated by loading shear force. The fracture propagation path of hydraulic fracturing was closely related to the preexisting fractures formed by the preshear stress. Short‐term hydraulic fracturing promoted fracture propagation and acoustic emission events (or microearthquake signals), but it was less likely to cause rock mass instability or a large earthquake. The long‐term fluid injection could saturate preexisting fractures and infiltrate rock mass to increase the pore pressure and change the in situ stress field in a large area to induce an earthquake.

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Section: Discussionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Short‐term failure mechanism triggered by hydraulic fracturing

Wang

Liu

2019

Energy Science & Engineering

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“…Wang et al (2017) analyzed shale gas hydraulic fracturing: a numerical investigation of the fracturing network evolution in the Silurian Longmaxi formation in the southeast of Sichuan Basin, Southwest China, using a coupled approach, which is relevant to geothermal development through EGS. Wang et al (2016b) carried out a laboratory investigation of hydraulic fracture propagation using real-time ultrasonic measurement in shale formations with random natural fractures. Niu et al (2017) conducted a numerical investigation on slippage characteristics of normal and reverse faults during fluid injection and production.…”

Section: Enhanced Geothermal Systems (Egs) and Related Technologymentioning

confidence: 99%

Progress and perspectives of geothermal energy studies in China: from shallow to deep systems

et al. 2018

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Applied techniques for residual oil recovery from source rocks: A review of current challenges and possible developments

Abdulkareem

Padmanabhan

2020

Can J Chem Eng

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Depleted fossil fuel resources have led to an investigation of other promising alternatives such as renewable and unconventional energy sources. Shale formations have limited permeability. Therefore, several extraction techniques have been applied to improve residual oil recovery and production. In this work, the techniques applied above ground to extract the organic fractions from oil/gas shale are discussed. Studies related to compositional fractionation, ultrasonic-assisted, microwave-assisted, supercritical fluids, and surface retorting techniques have been conducted systematically in approximately 150 scholarly articles over the past 10 years. The impacts of each technique as well as the drawbacks and challenges are highlighted in this paper. The fractionation techniques are sufficient in general; however, they are time consuming as they include several stages and use a considerable amount of solvents. Ultrasonic and microwave techniques are highly reliant on formation transparency linked to the organic fraction heterogeneous distribution. The surface retorting method, which is highly efficient with up to 90% recovery, for example, the Galoter and Paraho methods, is still dependent on shale particulate size, generates a massive amount of spent shale as waste, and is prominently emissive. Therefore, assessments that can be used to overcome existing drawbacks are considered. This can provide practical insight about these techniques to overcome limitations and concerns in terms of efficiency, cost, environmental issues, and reliability features. The work highlights the dominant extraction techniques for further development.

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Laboratory investigation of hydraulic fracture propagation using real-time ultrasonic measurement in shale formations with random natural fractures

Cited by 15 publications

References 33 publications

Short‐term failure mechanism triggered by hydraulic fracturing

Short‐term failure mechanism triggered by hydraulic fracturing

Progress and perspectives of geothermal energy studies in China: from shallow to deep systems

Applied techniques for residual oil recovery from source rocks: A review of current challenges and possible developments

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