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| Analysis on rock-breaking property of supercritical carbon dioxide particles jet |
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DU Yukun1,2, CHEN Xiaohong2,3, WANG Ruihe1, YUE Weimin4, DU Qiang5, BAI Diangang5, HAO Guoliang6, ZHOU Yan7
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(1.School of Petroleum Engineering in China University of Petroleum(East China), Qingdao 266580, China;2.Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Scienceand Technology, Qingdao 266071, China;3.School of Geosciences in China University of Petroleum(East China), Qingdao 266580, China;4.Beijing Institute of Exploration Engineering, Beijing 100083, China;5.Seabeach Development Company, Dagang Oilfield, Tianjin 300280, China;6.Huanxiling Oil Production Plant, Liaohe Oilfield, Panjin 124114, China;7.Exploration and Development Research Institute, Liaohe Oilfield, Panjin 124010, China)
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| Abstract: |
| Because the rock-breaking threshold pressure of most unconventional reservoir rocks such as shale and tight sandstone are very high, the supercritical carbon dioxide particles jet are formed by adding the particles into jet in order to improve the rock-breaking efficiency and take full advantage of supercritical carbon dioxide. On the basis of the optimization of the supercritical carbon dioxide jet rock-breaking experimental process, a supercritical carbon dioxide particles jet rock-breaking experimental device was built, and the rock-breaking property of the supercritical carbon dioxide particles jet was analyzed. It is found that the rock-breaking property of the supercritical carbon dioxide particles jet is greatly enhanced by 66.67％ after adding quartz particles in 30 s compared with the pure supercritical carbon dioxide jet. Also, the rock-breaking property of supercritical carbon dioxide particles jet first enhances and then weakens with the increase of nozzle diameter and standoff distance. It is determined that the optimal nozzle diameter is 3 mm, standoff distance is 6 mm and quartz sand with particle size is 0.3-0.5 mm, which are determined under the experimental condition. The higher the jet pressure and temperature is, the stronger the rock-breaking property of the jet will be obtained. However, the increasing trend slows down gradually. |
| Key words: supercritical carbon dioxide particles jet rock-breaking |
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