Moving perforation of rocks using long pulse Nd:YAG laser |
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| Affiliation: | 1. Amirkabir University of Technology, PhD Candidate of Rock Mechanics, Department of Mining and Metallurgical Engineering, Rock Mechanics Group, Tehran, Iran;2. Amirkabir University of Technology, Department of Mining and Metallurgical Engineering, Rock Mechanics Group, Tehran, Iran;3. Tarbiat Modares University, Rock Mechanics Group, Tehran, Iran;4. Iranian National Center for Laser Science and Technology, P.O. Box 14665-576, Tehran, Iran;1. Facultat de Ciències de la Terra, Universitat de Barcelona (UB), Martí i Franquès s/n, 08028 Barcelona, Spain;2. Laser Research Laboratory, Department of Physics, University of Tehran, Tehran 1439955961, Iran;3. Department of Petroleum Engineering, Omidiyeh Branch, Islamic Azad University, Omidiyeh, Iran;1. Division of Urology, Department of Surgery, Show Chwan Memorial Hospital, Changhua, Taiwan;2. Department of Urology, E-Da Hospital, and I-Shou University, Kaohsiung, Taiwan;3. Division of Urology, Department of Surgery, Taipei Tzu Chi General Hospital, Buddhist Tzu Chi Medical Foundation, New Taipei, Taiwan;4. Department of Urology, Buddhist Tzu Chi General Hospital and Tzu Chi University, Hualien, Taiwan |
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| Abstract: | Laser perforating is a new method in oil and gas wells where researchers look for an alternative to explosive methods. One of the important problems with this method is the generation of uniform and cylindrical holes at a selected pitch for enhancing the permeability of rocks. In non-moving laser perforation, the nozzle of the laser and the rock do not approach each other and due to laser convergence in a point, uniform and cylindrical holes are not created. For this reason, moving laser perforation is suggested in this research. One of the important parameters in moving laser perforation is the power of the laser that can be perforated at a specific rate. In this article we predicted the laser power for a definite rate of perforation (ROP) and then the accuracy of this prediction was evaluated to support the experiments. A pulsed Nd: YAG laser, with a pulse energy around 5.5 J, pulse repetition rate of 30 Hz and pulse duration of 2 ms were used for rock perforation in this study. The results shows that the presented relation for perforation could reliably be used in practice. Furthermore, by knowing the rate of perforation, the required laser power for consistent drilling could be calculated. |
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| Keywords: | Laser perforating Explosives methods Well completion |
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