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Outline
To investigate effects of precise millisecond time delay detonation on the layered blasting in a single well completion, the millisecond time between holes within the layer was determined by theoretical calculation, and the JH-2 rock model was used in LS-DYNA software to simulate the precise delayed layered detonation in a single well completion blasting of large-diameter deep holes. Blasting effects of two types of delay time were compared, and the process of rock damage evolution in the wellbore was analyzed, finally field tests were conducted to verify the delay time parameters. The numerical calculation results revealed that through considering a comprehensive analysis of the dynamic rock damage process, the characteristic cross-sectional area of the blasting chamber, and the extent of rock damage, a delay time of 18 ms between layers of blasting proved to be more effective. The optimal delay time was determined by theoretical analysis and numerical simulations. Both field tests and numerical simulations demonstrated that the wellbore formation closely matched in the selected cross-sectional area characteristics, with a similarity ranging from 83.4% to 96.6% and an average similarity of 92.4%. This study highlights that the precise millisecond time delay layered blasting method, obtained through the combination of theoretical analysis, numerical simulation, and field tests (referred to as the “trinity analysis method”), providing reliable and accurate results. It holds practical value and is of significant importance for guiding real-world applications in single blasting well completion projects.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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