超级13Cr钢液固两相流体冲蚀实验研究

在大排量高砂比压裂过程中,携砂压裂液对管柱和井下工具的冲蚀是引起设备损伤的主要原因.利用自行研制的喷射式冲蚀实验装置,研究了冲蚀时间、喷射流速和含砂量对超级13Cr钢冲蚀速率的影响.研究结果表明,冲蚀时间在90～120 min之间时,超级13Cr钢冲蚀速率趋于稳定;在喷射流速超过5.6m/s时,因为冲刷腐蚀的协同作用导致冲蚀速率急剧上升;冲蚀速率在含砂量为25 kg/m3时冲蚀速率达到最大值,此后随着含砂量增加,由于颗粒之间碰撞效应导致颗粒撞击到材料表面的动能降低,冲蚀速率开始减小,在50 kg/m3时达到最小值,随后又随着含砂量的增加而缓慢增加.研究结果为油田压裂施工工艺参数优化以及管柱安全评价提供了一定参考.

Experimental Study for the Erosion of Super-13Cr Steel in the Liquid-solid Two-phase Fluids

Erosion-corrosion in massive fracturing play an important role in the failures of tubing strings for the high slurry fracturing fluid flow. In our study, the erosion-corrosion for Super-13Cr steel with 3.5wt% NaCl containing sand were investigated by weight loss method in the self-made jet experiment device including the effect of erosion time, erosion fluid velocity and sand concentration. The erosion rate reaches a steady value in 90-120 minutes. With increasing slurry velocity, the erosion rate increase rapidly above 5.6 m/s due to the synergism of erosion-corrosion. . However, the erosion rate attains a maximum in the 25kg/m3 and increases slowly with sand concentration above 50 kg/m3. The results can provide some advices to the safe evaluation in the massive fracturing work.