超临界二氧化碳射流中的颗粒跟随及影响因素
发布时间：2019-04-12 13:56
【摘要】：超临界二氧化碳射流具有破岩速度高、门限压力低等优势,加入磨料颗粒形成超临界二氧化碳磨料射流,将取得更高的冲蚀切割效率。为研究超临界二氧化碳磨料射流可行性,采用数值模拟方法,对比分析了单个颗粒在超临界二氧化碳等流体射流中的运动特征,揭示了流体温度、磨料粒径对颗粒跟随运动的影响规律。结果表明,与相同条件下在水与压裂液射流中相比,磨料颗粒在超临界二氧化碳射流中运动规律相似,但初始滑脱速度较大、跟随能力较弱,获得的喷射速度与撞击靶件壁面速度较高,表明超临界二氧化碳具有良好的颗粒携带能力;流体温度升高、磨料粒径增大均会使颗粒滑脱速度增大、削弱跟随运动效率,但同时也降低了喷嘴外流场中颗粒所受运动阻力,显著提高了喷射速度与撞击壁面速度。由此可知,对于石英、陶粒等常用磨料材质,在常规储层温度(60~140℃)与粒径范围(20~70目)内,超临界二氧化碳磨料射流可有效形成并进行高效冲蚀切割作业。
[Abstract]:The supercritical carbon dioxide jet has the advantages of high rock breaking speed and low threshold pressure. Adding abrasive particles to form supercritical carbon dioxide abrasive jet will achieve higher erosion cutting efficiency. In order to study the feasibility of supercritical carbon dioxide abrasive jet, the motion characteristics of single particle in supercritical carbon dioxide and other fluid jets were compared and analyzed by numerical simulation method, and the fluid temperature was revealed. The influence of abrasive particle size on particle following motion. The results show that the motion of abrasive particles in supercritical carbon dioxide jet is similar to that in water and fracturing fluid jet under the same conditions, but the initial slippage speed is larger and the ability to follow is weak. The jet velocity obtained and the wall velocity of the impact target are relatively high, indicating that supercritical carbon dioxide has a good particle carrying capacity. When the fluid temperature is increased, the particle slip velocity will be increased and the following motion efficiency will be weakened when the abrasive particle size increases, but at the same time, the motion resistance of the particle in the nozzle outflow field will also be reduced, and the jet velocity and the impinging wall velocity will be significantly increased. It can be seen that the supercritical carbon dioxide abrasive jet can be effectively formed and efficiently eroded in the conventional reservoir temperature (60? 140 鈩，
本文编号：2457079
[Abstract]:The supercritical carbon dioxide jet has the advantages of high rock breaking speed and low threshold pressure. Adding abrasive particles to form supercritical carbon dioxide abrasive jet will achieve higher erosion cutting efficiency. In order to study the feasibility of supercritical carbon dioxide abrasive jet, the motion characteristics of single particle in supercritical carbon dioxide and other fluid jets were compared and analyzed by numerical simulation method, and the fluid temperature was revealed. The influence of abrasive particle size on particle following motion. The results show that the motion of abrasive particles in supercritical carbon dioxide jet is similar to that in water and fracturing fluid jet under the same conditions, but the initial slippage speed is larger and the ability to follow is weak. The jet velocity obtained and the wall velocity of the impact target are relatively high, indicating that supercritical carbon dioxide has a good particle carrying capacity. When the fluid temperature is increased, the particle slip velocity will be increased and the following motion efficiency will be weakened when the abrasive particle size increases, but at the same time, the motion resistance of the particle in the nozzle outflow field will also be reduced, and the jet velocity and the impinging wall velocity will be significantly increased. It can be seen that the supercritical carbon dioxide abrasive jet can be effectively formed and efficiently eroded in the conventional reservoir temperature (60? 140 鈩，
本文编号：2457079
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