【摘要】：超臨界二氧化碳射流具有破巖速度高、門限壓力低等優(yōu)勢,加入磨料顆粒形成超臨界二氧化碳磨料射流,將取得更高的沖蝕切割效率。為研究超臨界二氧化碳磨料射流可行性,采用數(shù)值模擬方法,對比分析了單個顆粒在超臨界二氧化碳等流體射流中的運動特征,揭示了流體溫度、磨料粒徑對顆粒跟隨運動的影響規(guī)律。結(jié)果表明,與相同條件下在水與壓裂液射流中相比,磨料顆粒在超臨界二氧化碳射流中運動規(guī)律相似,但初始滑脫速度較大、跟隨能力較弱,獲得的噴射速度與撞擊靶件壁面速度較高,表明超臨界二氧化碳具有良好的顆粒攜帶能力;流體溫度升高、磨料粒徑增大均會使顆�；撍俣仍龃�、削弱跟隨運動效率,但同時也降低了噴嘴外流場中顆粒所受運動阻力,顯著提高了噴射速度與撞擊壁面速度。由此可知,對于石英、陶粒等常用磨料材質(zhì),在常規(guī)儲層溫度(60~140℃)與粒徑范圍(20~70目)內(nèi),超臨界二氧化碳磨料射流可有效形成并進行高效沖蝕切割作業(yè)。
[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，

本文編號：2457079