Research on Initiation of Carbon Dioxide Fracturing Pipe Using the Liquid Carbon Dioxide Phase-Transition Blasting Technology

Xia, Jieqin; Dou, Bin; Tian, Hong; Zheng, Jun; Cui, Guodong; Kashif, Muhammad

doi:10.3390/en14030521

Cited by 16 publications

(5 citation statements)

References 34 publications

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“…To veri sion, the experimental results are compared with the shear sheet damage e ure 5. As can be seen from Figure 5, the experimental results are similar to those of previous studies [13,14], and the shear damage equation fits the experimental test shock wave peak pressure well. Therefore, the shear damage formula can replace the supercritical CO 2 phase Symmetry 2023, 15, 1802 7 of 13 transition shock pressure in Equation (10) for calculation.…”

Section: Supercritical Co2 Phase Transition Shock Testsupporting

confidence: 86%

“…The technology was originated by the United Kingdom Cardox company, who developed a physical blasting device, mainly consisting of an inflatable head, heat pipe, liquid storage tube, sealing ring, shear blade energy release head, and six other major components, which are the main working media of liquid CO 2 blasting equipment [4,5]. The principle is to heat the heating tube so that the liquid CO 2 inside the fracturing tube rapidly realizes the phase change, and thus the volume of the instantaneous expansion of a strong pressure to achieve effective rock breaking, which conforms to the green and environmentally friendly method of rock breaking [6,7]. The technology was introduced to China by Guo Zhixing and Xu Ying, and has been gradually applied to the various fields of engineering and construction [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…Existing views are generally that the supercritical CO 2 phase change rock breaking project concerning rock fragmentation is essentially the result of a shock wave and highenergy gases working together [12]. In the CO 2 phase change blasting process, a shear blade rupture CO 2 high-pressure gas shock wave is formed, and the initial peak shock pressure size and CO 2 charge and shear blade thickness are highly correlated, of which the thickness of the shear blade is the main control variable [13,14]. After the high-pressure gas impacts the rock body, incident rock body stress is formed, which is greater than the rock body rupture pressure, and the rock body becomes damaged.…”

Section: Introductionmentioning

confidence: 99%

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Decay Law of Supercritical CO2 Phase Transition-Induced Shock Waves in Rocky Media

Zhang,

Zeng,

Wei

et al. 2023

Symmetry

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Supercritical CO2 phase change fracturing technology has been widely used in rock engineering, with the advantages of low disturbance and no pollution. However, the phase change shock wave inevitably affects the surrounding environment, and the influence range is still unclear. In this paper, we present a computational model for the symmetric generation, propagation, and attenuation of supercritical CO2 phase transition shock waves, with the center of the borehole as the origin, based on the C–J theory. The attenuation of the shock wave in the rock medium under the influence of the type of fracturing tube, the thickness of the shear sheet, and the rock performance parameters are further analyzed. The results show that the rock stress under the action of the phase change shock wave attenuates logarithmically with the propagation distance, which correlates with the magnitude of the incident rock stress at the borehole wall. The incident rock stress decreases with the increase in the initial density of CO2 in the fracturing tube, increases linearly with the thickness of the shear sheet, and correlates with the rock wave impedance.

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Section: Supercritical Co2 Phase Transition Shock Testsupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Decay Law of Supercritical CO2 Phase Transition-Induced Shock Waves in Rocky Media

Zhang,

Zeng,

Wei

et al. 2023

Symmetry

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“…The shock over-pressure increases with the increase in blasting pressure. The distance of the shockwave decreased with an increase in filling pressure [18,19]. However, previous studies have mainly focused on the propagation of rock cracks and the maximum peak pressure The blasting efficiency of CO 2 -PB is closely related to the impact of the dynamic loading on the rock.…”

Section: Introductionmentioning

confidence: 98%

On the Factors of Impact Pressure in Supercritical CO2 Phase-Transition Blasting—A Numerical Study

Liu

2022

Energies

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Carbon dioxide phase transition blasting (CO2-PB) technology is an effective and economical technology used for breaking rocks. The use of CO2-PB can significantly reduce the vibration damage to surrounding rocks. There is little research on the shockwave generated by the CO2-PB, and simulation can better show the flow field characteristics. In order to clarify the mechanism of its blasting load process, a theoretical analysis and a numerical model were developed to study the flow-field characteristics and the impact pressure of CO2-PB. Our results show that the CO2 absorbs heat from the surrounding environment, producing a significant low-temperature area. The overpressure is significantly lower than the driving gas pressure to the ambient pressure, limiting the maximum over-pressure that can be obtained. When the pressure in CO2-PB reaches 100 MPa, the shockwave is about 4.25 MPa. As the distance increases, the peak value of the shockwave decays rapidly. As the dimensionless distance increases from 1 to 5, the dimensionless overpressure decreases from 1 to 0.23. Under the same blasting pressure, increasing the filling pressure and increasing the filling volume slightly reduce the initial pressure of the shockwave. In the shock stage, strong compression is formed on the surface of the shockwave, resulting in a higher peak pressure value. Meanwhile, the stable pressure is influenced by the target distance, blasting pressure, and CO2-PB length.

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“…Subsequently, it was widely used in coal mines in many countries [2]. Nowadays, CO 2 phase change fracturing has once again attracted attention due to the advantages of rock-soil blasting and excavation in complex environments [3][4][5]. Wang et al [6] studied the phase change fracturing process of liquid CO 2 from theoretical analysis and numerical simulation, established a mathematical model of coal seam fracturing pressure, and analyzed the fracturing influence range.…”

Section: Introductionmentioning

confidence: 99%

Classification Method and Application of Rock Fracture Ability by Supercritical CO2 Blasting

Zhu

Jia²,

Cai³

2022

Shock and Vibration

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In order to study the fracture ability classification of rock mass under the cracking action of supercritical CO2 phase transition, based on the classification theory of rock mass in blasting engineering, an analytic hierarchy process (AHP)-entropy weight method (EWM) and the cloud model classification method for rock mass cracking under CO2 phase transformation are proposed. In this method, rock density, rock tensile strength, rock wave impedance, and rock mass integrity coefficient are used as the factors to determine the level of rock mass fracturing, and the evaluation index system of rock mass fracturing is established. Through this evaluation method, the rock mass in a reconstruction project section of Nyingchi, Tibet, is classified and evaluated. The results present that this new classification method of rock mass fracture ability uses AHP–EWM to carry out the weight distribution of the classification index. In addition, it is combined with the cloud model for the classification division, overcoming the traditional classification method fixed with appraisal pattern flaw. Therefore, it has validity and feasibility. According to the characteristics of fracture ability, the rock masses in the area to be rebuilt on the Tibet Highway are divided into grade II, grade III, and grade IV, which provides scientific guidance for the construction of the project.

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Research on Initiation of Carbon Dioxide Fracturing Pipe Using the Liquid Carbon Dioxide Phase-Transition Blasting Technology

Cited by 16 publications

References 34 publications

Decay Law of Supercritical CO2 Phase Transition-Induced Shock Waves in Rocky Media

Decay Law of Supercritical CO2 Phase Transition-Induced Shock Waves in Rocky Media

On the Factors of Impact Pressure in Supercritical CO2 Phase-Transition Blasting—A Numerical Study

Classification Method and Application of Rock Fracture Ability by Supercritical CO2 Blasting

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