The influence of laser irradiation parameters on thermal breaking characteristics of shale

Pan, Haizeng; Hu, Yi; Kang, Yong; Chen, Hao; Liu, Feng; Xie, Jiaqiao; Wang, Xiaochuan

doi:10.1016/j.petrol.2022.110397

Cited by 15 publications

(3 citation statements)

References 25 publications

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“…In order to improve the tunneling efficiency in TBM excavation, researchers are trying to apply high-efficiency rock breaking technologies such as high-pressure water jet [5][6], microwave [7][8] and laser [9][10] to the TBM field. Among them, laser technology has relatively high application prospects in this field due to its outstanding advantages such as non-contact energy transmission, large heat transfer ratio, and high energy concentration [11].…”

Section: Introductionmentioning

confidence: 99%

Accuracy Assessment of “Step-by-Step” Simulation Modeling Method for Rock Breaking by TBM Disc Cutters Assisted with Laser

Zhang

Kuang

Liu

et al. 2023

Period. Polytech. Civil Eng.

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Rock breaking by laser-assisted disc cutters is a novel high-efficiency rock breaking mode that combines mechanical stress induced by the disc cutters with thermal cracking by laser. This paper presented a “step-by-step” simulation modeling concept, and conducted an in-depth study on potential influencing factors of simulation accuracy at each key step. First, the prediction accuracy of laser holes in laser drilling simulation was discussed. Second, the SHPB simulation and experiment were carried out to evaluate the accuracy of the selected material constitutive model in simulating the dynamic fracture damage of rock. Then, taking the laser-assisted rock-penetrating process of the scaled disc cutter as an example, the simulation prediction accuracy of rock-breaking by the disc cutter was analyzed. Finally, the simulation and experiment of laser-assisted disc cutter penetration into rock was carried out, and then the feasibility of the “step-by-step” concept was analyzed. The results show that: (1) in the laser drilling simulation, the predicted accuracy of laser hole size is higher when the power is low; with the laser power increases, the large amount of glass glaze will affect the subsequent modeling accuracy; (2) the HJC model can be used to simulate the transient nonlinear fracture damage behavior of granite; (3) the damage morphology of the granite obtained by the penetration simulation is highly similar to the experimental results, and the load curve should be corrected by the peak point fitting method. The results show the application prospects of the proposed numerical modeling method in future laser-assisted TBM tunnelling.

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Section: Introductionmentioning

confidence: 99%

Accuracy Assessment of “Step-by-Step” Simulation Modeling Method for Rock Breaking by TBM Disc Cutters Assisted with Laser

Zhang

Kuang

Liu

et al. 2023

Period. Polytech. Civil Eng.

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“…In order to achieve the efficient and micro-disturbance sampling of unmanned drilling of lunar rock, it is urgent to innovate the drilling method and develop efficient drilling advanced drilling equipment. For this reason, some scholars put forward the idea of jet, microwave [10][11][12] , laser and other new means to assist in mechanical breaking of hard rock, and carried out a series of beneficial research.Laser as a monochromatic and directional high energy density beam is widely used [13,14].Laser rock breaking technology has been widely concerned by scholars due to its attractive prospect of low cost, high efficiency and high reliability, and has become a research hotspot in recent years [15].Yang et al [16]carried out the hard rock breaking experiment with fiber laser and described the evolution process of laser perforation in detailToshio et al [17]studied the mechanism of borehole rupture by fixed and moving lasers.Pan et al [18] studied the influence of laser irradiation parameters on the special fracture characteristics of shale.Chen et al [19] found that the penetration rate of elliptical laser assisted bit drilling is 61% higher than that of conventional non laser drilling.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on characteristic and mechanism of simulated lunar rock destruction under high energy laser irradiation

et al. 2023

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The large load and poor heat dissipation of moon rock core drilling leads to the difficulty of rock breaking and low drilling and sampling efficiency. As a new auxiliary rock breaking method, laser rock breaking is expected to be applied to perturbation sampling in lunar rock drilling. Revealing the fracture characteristics and mechanism of rock under laser irradiation is an important basis for realizing laser-assisted lunar rock sampling. Basalt was used as simulated lunar rock sample, and its mechanical response characteristics under laser irradiation were analyzed from macro to micro point of view, and the failure law under different laser power and different irradiation time was explored. The results show that the failure of the sample under laser irradiation is mainly characterized by local rock melting and dynamic crack propagation, and the surface temperature of the sample follows the characteristics of Gaussian distribution. The laser power has a greater influence on the degree of rock weakening than the irradiation time. Laser irradiation of rocks can significantly reduce rock strength, and has obvious effects on improving rock breaking efficiency and reducing in situ disturbance. It is expected to provide theoretical and technical support for assisting lunar rock drilling and sampling in the future.

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“…With the increase in energy demand, unconventional oil and gas resources represented by shale gas have been paid more and more attention by various countries. , To realize the economic and large-scale exploitation of shale gas, hydraulic fracturing has been widely used as the main method of increasing oil and gas production. , However, hydraulic fracturing has some disadvantages in the field application: (1) in some shale reservoirs, water will interact with clay minerals to hydrate and expand, shrink the pore throat, and produce a water lock effect. − (2) A large amount of wastewater remaining in the reservoir after hydraulic fracturing will cause groundwater pollution. , (3) Access to water resources for shale gas reservoirs in arid regions is also a problem. , …”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Proppant Transport in Supercritical Carbon Dioxide under Different Fracture Shapes: Flat, Wedge-Shaped, and Bifurcated

Xie

Kang

et al. 2022

Energy Fuels

Self Cite

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As a new type of waterless technology, supercritical carbon dioxide fracturing has been widely studied by scholars in recent years, and the migration characteristics of the corresponding proppant in supercritical carbon dioxide still need further research. In this paper, the Eulerian–Eulerian computational fluid dynamics method was used to study the transport capacity of supercritical carbon dioxide, and the UDF method was used to simulate the physical parameters of supercritical carbon dioxide. In view of the deficiencies of previous studies, the special cases of wedge-shaped fractures and bypass fractures are considered, and the influence of large-span pressure and temperature on migration is first analyzed in plane fractures, which makes this study more complete. The results show that: (1) compared with slickwater, the proppant transport channel in supercritical carbon dioxide is 30% smaller at 305 K and 10 MPa. (2) The transport capacity of supercritical carbon dioxide increases with the increase of pressure and decreases with the increase of temperature. But when the pressure or temperature is too high, they have little effect on it. (3) In wedge-shaped fractures, the proppant stack height and length increase initially as the shrinkage rate of fracture width (the ratio of the fracture reduced width to the fracture length) increases. However, as the fracture width ratio increases, the maximum proppant stack height decreases in the later stage. (4) In bifurcated fractures, with the increase of bypass angle, the area of proppant in the bypass zone tends to decrease. The width of the bypass inlet has little effect on the proppant settlement in the bypass. This study further understands the migration law of proppant in supercritical carbon dioxide in fractures.

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The influence of laser irradiation parameters on thermal breaking characteristics of shale

Cited by 15 publications

References 25 publications

Accuracy Assessment of “Step-by-Step” Simulation Modeling Method for Rock Breaking by TBM Disc Cutters Assisted with Laser

Accuracy Assessment of “Step-by-Step” Simulation Modeling Method for Rock Breaking by TBM Disc Cutters Assisted with Laser

Experimental study on characteristic and mechanism of simulated lunar rock destruction under high energy laser irradiation

Numerical Study on Proppant Transport in Supercritical Carbon Dioxide under Different Fracture Shapes: Flat, Wedge-Shaped, and Bifurcated

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