大庆徐深气田在大规模压裂改造过程中，高速携砂压裂液对油管造成了严重的冲蚀，导致压裂施工风险增加。采用自主研制的喷射式冲蚀实验装置，以质量分数为0.2%的胍胶压裂液和石英砂形成的液固两相流体为介质，研究了压裂液流速、液体入射角对P110油管钢冲蚀行为的影响。研究表明，随压裂液速度的增加，冲蚀速率并非呈线性关系增加，而是存在“临界”流速，超过此流速时，油管钢冲蚀速率会以指数形式增长；油管在胍胶压裂液中的材料损伤机理为“微切削”与“冲击锻打”2种机理并存，在液体入射角为45°时冲蚀速率最大。通过上述研究拟合得到的冲蚀速率计算模型，可预测出P110油管钢在注入不同液体量后，其壁厚损失随压裂液排量的变化。研究结果为徐深气田油管在大规模压裂施工中的安全评价提供了有力支撑。
Tubings used in fracturing operation were severely eroded by the fracturing fluid carrying sand at a high speed during large scale of fracturing in Xushen Gas-Field of Daqing Oilifeld, resulting in high risk of operation failure. Effects of lfow speed and incident angle of fracturing lfuid on erosion behavior of P110 tubing steel were studied by an independently developed jet erosion experimental equipment with a solid-liquid mixture of quartz sand and guanidine gum fracturing lfuid of 0.2%(mass fraction). The results show that the erosive rate does not linearly increase with the increase of lfow speed of fracturing lfuid. There is a critical lfow speed. Erosive rate of tubing grows in an exponential manner when the lfow speed of fracturing lfuid is larger than that critical lfow speed. There are two mechanisms of micro-shearing and impact for erosion of tubing in the fracturing lfuid. Erosive rate of P110 tubing steel is the highest when the incident angle of fracturing lfuid is 45°. Based on the erosion rate model obtained by the research, the relation between the decrease of thickness of P110 tubing steel and amount of fracturing lfuid can be calculated. The results of the simulation play an important role in reliability assessment for tubing used in large scale fracturing operation in Xushen Gas-Field.
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