高速射流孔眼冲刷腐蚀扩孔规律试验研究

Experimental study on the law of hole erosion and reaming in high speed jet flow

油田压裂液喷射过程中,流体中的颗粒撞击套管射孔孔眼造成严重的冲蚀扩孔,导致孔眼直径增大,套管强度降低。利用高速液固两相流冲蚀试验台架,在单孔眼流道改变流速、砂比和粒径条件进行冲蚀试验,并对冲蚀孔眼边缘进行三维轮廓扫描,探究高速射流孔眼冲刷腐蚀扩孔规律。研究表明,孔眼冲蚀速率随流速、砂比、粒径增加而增大,流速和砂比的改变对于孔眼冲蚀影响最为显著。通过研究孔眼冲刷腐蚀扩孔规律,有助于改进各簇均衡起裂与进液施工工艺设计。

During the oilfield fracturing process, the particles impacted the casing injection borehole, causing severe erosion and reaming. Combined with the corrosion interaction, this led to an increase in hole diameter and a decrease in casing strength. By using the high-speed liquid-solid two-phase flow erosion test rig, the experiment was carried out under the condition of changing the flow rate, sand concentration and particle size of the single-hole flow channel. The three-dimensional contour scanning was conducted on the edge of the erosion orifice to study the erosion and corrosion of perforation tunnel in high speed jet flow. The results showed the erosion rate of perforation holes accelerated with the raise of velocity, sand concentration and particle size, and the change of velocity and sand concentration had the most significant effect on the erosion. Therefore, studying the law of hole erosion and expansion was conducive to improving the construction process design of equilibrium crack initiation and liquid feeding.