固体颗粒对喷砂器冲蚀磨损特性的影响

Effect of Solid Particles on Erosion Characteristics of Sandblaster

采用OKA磨损模型预测冲蚀情况并用Fluent软件计算磨损率。运用相似理论,根据现场压裂实际使用的喷砂器结构,设计用于实验测量的喷砂器实验装置,建立激光多普勒测试系统(LDA),对喷砂器内部流场进行测量,并与流场模拟结果进行对比,LDA实验结果和流场模拟结果吻合较好。流场和磨损分析结果表明:携砂压裂液进入导压主体时形成了两个对称的涡流,喷砂器内部的支撑剂分布不均匀,对喷砂器内套的中部和后部造成了严重磨损,模拟得到的喷砂器冲蚀磨损形貌与现场施工后的磨损形貌基本一致;随着流量的增加,磨损率急剧增加,与含砂量相比,流量是影响磨损率的主要因素。

The OKA abrasion model was employed to predict internal washout and Fluent software was adopted to calculate wear rate.Through making use of similarity theory,basing on sandblaster structure actually-used in the fracturing operation,an experimental device used for sandblaster in experimental measurement was designed,including laser doppler measurement system(LDA)for internal flow field measurement of the sandblaster.Compared with the flow field simulation results shows that,the LDA experimental results and flow field simulation results are in good agreement;the flow field and wear analysis results show that,two symmetrical vortices will be formed when the sand-carrying fracturing fluid enters the main body,and the proppant unevenly distributed inside the sandblaster will cause serious wear to inner sleeve’s central and rear section of the sandblaster.The erosion wear morphology simulated in the sandblaster complies with that obtained after the field construction.With the increase of flow rate,the wear rate increases sharply and compared with the sand content,the flow rate becomes the main factor which affecting the wear rate.