Experimental study of supercritical CO2 fracturing on initiation pressure and fracture propagation in shale under different triaxial stress conditions

Jiang, Yongdong; Qin, Chao; Kang, Zhipeng; Li, Ye; Hui, Lam; Xiao, Song

doi:10.1016/j.jngse.2018.04.022

Cited by 88 publications

(23 citation statements)

References 37 publications

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“…Damani et al [52] reported that the fracture pressure response can be divided into six broad regions according to the pump pressure and cumulative AE events. Jiang et al [53] divided the shale supercritical CO 2 fracturing process into the fracture initiation stage and the fracture propagation stage according to the AE parameter curves. Figure 4 shows the relationship of the AE counts, the AE energy, and the loading pore pressure for the horizontal samples (H1, H2, H3).…”

Section: Resultsmentioning

confidence: 99%

“…When the Mohr stress circle reached the rupture envelope surface, the rock broke down and generated a large amount of AE events [5,54,55]. Therefore, the hydraulic fracturing process can be roughly divided into three stages based on these plots [52,53,56]. First is the initial stage, which corresponds to the beginning of the water injection, where a small number of AE events occurred as the pore pressure increased instantaneously.…”

Section: Resultsmentioning

confidence: 99%

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Multifractal Analysis of Acoustic Emissions during Hydraulic Fracturing Experiments under Uniaxial Loading Conditions: A Niutitang Shale Example

Tan

Xie

et al. 2020

Geofluids

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Fracture characterization is essential for estimating the stimulated reservoir volume and guiding subsequent hydraulic fracturing stimulations in shale reservoirs. Laboratory fracturing experiments can help provide theoretical and technical guidance for field operations. In this study, hydraulic fracturing experiments on the shale samples from Niutitang Formation in Hunan Province (China) under a uniaxial loading condition are conducted. The multifractal method is used to analyze the acoustic emission (AE) signals and characterize fracture initiation and propagation. The hydraulic fracturing process can be divided into three stages based on the characteristics of AE signals: the initial stage, the quite stage, and the fracturing stage. The multifractal analysis results showed that: (1) the value of the spectrum width, Δα, continues to increase as the energy accumulates until the fracturing stage starts; and (2) the difference in the multifractal spectrum values, Δf, reflects the relationship between small and large signal frequencies and can quantify the fracture scale, i.e., the lower the Δf, the larger the fracture scale and vice versa. The results were further verified using a time-frequency analysis of the AE signals and micro-CT scanning of the samples. This study demonstrates that the multifractal method is feasible for quantitatively characterizing hydraulic fractures and can aid field hydraulic fracturing operations.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Multifractal Analysis of Acoustic Emissions during Hydraulic Fracturing Experiments under Uniaxial Loading Conditions: A Niutitang Shale Example

Tan

Xie

et al. 2020

Geofluids

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show abstract

“…212 The reservoir stress and temperature, which also affect the fracturing characteristics, have been investigated by some researchers. 78,216,217 The increase of temperature reduced the viscosity of SC-CO 2 which can easily permeate into the microcrack tip and promote fracture propagation. The SC-CO 2 flow in newly created void fractures will enhance fracturing because of the thermo-mechanical effects caused by the Joule-Thompson throttling process.…”

Section: Using Sc-co 2 As a Fracturing Fluidmentioning

confidence: 99%

The role of supercritical carbon dioxide for recovery of shale gas and sequestration in gas shale reservoirs

Lyu

Tan

et al. 2021

Energy Environ. Sci.

124

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“…CO2 has been considered to be a new king of fracturing fluid, which can be alternatives to the conventional aqueous fracturing fluid, due to its advantages of miscibility with hydrocarbons and enhanced fracturing properties [2]. Hydraulic fracturing experiments with supercritical CO 2 have been conducted by some research institutions [3][4][5][6][7][8]. These experiment results provided valuable information to predict the initiation and propagation of artificial fracture in hydrofracturing with supercritical CO 2 .…”

Section: Introductionmentioning

confidence: 99%

Hydromechanical-Coupled Cohesive Interface Simulation of Complex Fracture Network Induced by Hydrofracturing with Low-Viscosity Supercritical CO2

Cai

Liu

2021

Lithosphere

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Hydraulic fracturing experiments with low-viscosity fluids, such as supercritical CO2, demonstrate the formation of complex fracture networks spread throughout the rocks. To study the influence of viscosity of the fracturing fluids on hydraulic fracture propagation, a hydromechanical-coupled cohesive zone model is proposed for the simulation of mechanical response of rock grains boundary separation. This simulation methodology considers the synergistic effects of unsteady flow in fracture and rock grain deformation induced by hydraulic pressure. The simulation results indicate a tendency of complex fracture propagation with more branches as the viscosity of fracturing fluids decrease, which is in accord with experimental results. The low-viscosity fluid can flow into the microfractures with extremely small aperture and create more shear failed fracture. This study confirms the possibility of effective well stimulations by hydraulic fracturing with low-viscosity fluids.

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Experimental study of supercritical CO2 fracturing on initiation pressure and fracture propagation in shale under different triaxial stress conditions

Cited by 88 publications

References 37 publications

Multifractal Analysis of Acoustic Emissions during Hydraulic Fracturing Experiments under Uniaxial Loading Conditions: A Niutitang Shale Example

Multifractal Analysis of Acoustic Emissions during Hydraulic Fracturing Experiments under Uniaxial Loading Conditions: A Niutitang Shale Example

The role of supercritical carbon dioxide for recovery of shale gas and sequestration in gas shale reservoirs

Hydromechanical-Coupled Cohesive Interface Simulation of Complex Fracture Network Induced by Hydrofracturing with Low-Viscosity Supercritical CO2

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