Study on the interaction mechanism between laser and rock during perforation

Yan, Fengyuan; Gu, Ya-fei; Wang, Yajun; Wang, Chunming; Hu, Xiyuan; Peng, Hanxiu; Yao, Zheng; Wang, Zheng; Shen, Yi

doi:10.1016/j.optlastec.2013.06.012

Cited by 35 publications

(6 citation statements)

References 13 publications

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“…The results show that the rate of perforation and specific energy are related to the laser-power output and irradiation time. Similar conclusions were reported by Yan et al [44] who investigated laser perforation on rocks.…”

Section: Introductionsupporting

confidence: 89%

Experimental Investigation on Compressive Strength, Ultrasonic Characteristic and Cracks Distribution of Granite Rock Irradiated by a Moving Laser Beam

Kuang

Sun

et al. 2022

Applied Sciences

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Efficient fracturing is the key issue for the exploitation of geothermal energy in a Hot Dry Rock reservoir. By using the laser irradiation cracking method, this study investigates the changes in uniaxial compressive strength, ultrasonic characteristics and crack distributions of granite specimens by applying a laser beam under various irradiation conditions, including different powers, diameters and moving speeds of the laser beam. The results indicate that the uniaxial compressive strength is considerably dependent on the power, diameter and moving speed of the laser beam. The ultrasonic-wave velocity and amplitude of the first wave both increase with a decreased laser power, increased diameter or moving speed of the laser beam. The wave form of irradiated graphite is flattened by laser irradiation comparing with that of the original specimen without laser irradiation. The crack angle and the ratio of the cracked area at both ends are also related to the irradiation parameters. The interior cracks are observed to be well-developed around the bottom of the grooving kerf generated by the laser beam. The results indicate that laser irradiation is a new economical and practical method that can efficiently fracture graphite.

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Section: Introductionsupporting

confidence: 89%

Experimental Investigation on Compressive Strength, Ultrasonic Characteristic and Cracks Distribution of Granite Rock Irradiated by a Moving Laser Beam

Kuang

Sun

et al. 2022

Applied Sciences

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“…1, and cracks can also be observed after the irradiation due to high temperature gradient within the specimen. The most important parameters of laser irradiation are laser power and irradiation time [33]. A series of experiments are conducted with varied laser power, laser beam diameter and moving speed of laser beam as shown in Table 5.…”

Section: Experimental Programmentioning

confidence: 99%

“…The impact of the pulse format on the drilling performance was investigated through numerical and experimental studies by Shin et al [32] where the key interaction physics between laser and material were emulated, such as heat transfer, vaporization, fluid flow, and multiple reflections. In a study by Yan et al [33], the interaction mechanism of rock perforation by laser irradiation was introduced to study the laser penetration at different depths and it was found that laser power and irradiation time affected the perforation the most. The thermal and mechanical characteristics of limestone rock, which was irradiated by continuous wave fiber laser with different laser power, were experimentally investigated by Wang et al [34].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of thermal fracturing of Hot Dry Rock irradiated by moving laser beam: Temperature, efficiency and porosity

et al. 2020

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A new laser irradiation fracturing method is employed to crack the Hot Dry Rock (HDR) and variations of rock temperature, specific energy (SE) and modified specific energy (MSE), thermal damages and open porosity of granite samples caused by moving laser beams with various irradiating conditions including laser power, diameter and moving speed of laser beam were investigated. Results indicate that rock temperature and the corresponding temperature gradients near the laser beam spots are strongly dependent on the laser power, beam diameter and irradiation time. The high temperature generated by the laser irradiation melts and cracks the HDR samples. The removed mass, cracked mass and size of grooving kerf induced by laser irradiation are also related to various irradiation conditions. SE and MSE are found nonlinearly reduced with the increased laser power density. Laser irradiation has a greater enhancement to thermal fracturing of granite than it does to thermal drilling. The open porosity (OP) of irradiated HDR samples increases with increasing laser power, decreasing diameter and moving speed of laser beam. The results can provide some guidance to those seeking a new economical and reasonable fracturing method for the HDR geothermal exploitation.

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“…Graves and Batarseh et al studied the impacts of high-power laser on rock strength and mechanical properties, and the results showed that the high temperature increased the porosity and permeability of the rock and reduced the strength of the rock [19,20]. e impacts of complex changes of rock vapor, plasma, and molten pool on rock properties during the laser perforation process were studied with the highspeed video imaged [21]. Jamali and Han et al carried out an experimental study on the feasibility of the laser heat treatment to weaken the rock structure, and the results showed that the rock strength had obviously weakened after laser irradiation, and the drillability of rock was greatly reduced [22,23].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Hard Rock Breaking with Fiber Laser: Surface Failure Characteristics and Perforating Mechanism

Yang

Zhou

Zhu

et al. 2020

Advances in Civil Engineering

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The rock-breaking characteristics and the influence factors of laser perforation are investigated in this study. A series of fiber laser perforation experiments on basalt, sandstone, and granite were conducted. Experimental measurements of rock failure morphologies and composition tests showed that the main surface features are thermal cracks and glazed layer formed by the melting and condensing of rock in laser perforation. It is also found that higher quartz content could help reduce the glazed degree of rock. Comprehensive results showed that the laser rock perforation is mainly formed by thermal fractures, the decline of molten pool, and the evaporating and splashing of the special melted rock components. The depth of rock perforation and SE usually increase with the laser irradiation time, while the ROP gradually decreases. With the increase of laser power, the perforation depth and ROP gradually increase, while the SE initially decreases and then increases indicating that there is an optimal power that maximizes perforation efficiency. It is believed that the strength of rock is the main factor affecting laser perforation efficiency, and the lower rock strength resulted in deeper perforation depth, higher ROP, and lower SE.

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Study on the interaction mechanism between laser and rock during perforation

Cited by 35 publications

References 13 publications

Experimental Investigation on Compressive Strength, Ultrasonic Characteristic and Cracks Distribution of Granite Rock Irradiated by a Moving Laser Beam

Experimental Investigation on Compressive Strength, Ultrasonic Characteristic and Cracks Distribution of Granite Rock Irradiated by a Moving Laser Beam

Experimental study of thermal fracturing of Hot Dry Rock irradiated by moving laser beam: Temperature, efficiency and porosity

Experimental Investigation on Hard Rock Breaking with Fiber Laser: Surface Failure Characteristics and Perforating Mechanism

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