连续管压裂冲蚀磨损性能研究

Erosion Wear Characteristic of Coiled Tubing in Fracturing Operation

鉴于连续管压裂冲蚀失效的研究较少,且不全面,采用欧拉-拉格朗日方法以及Finnie冲蚀磨损理论,研究了压裂液对螺旋段连续管冲蚀磨损机理。采用控制变量法分别研究了支撑剂质量浓度、携砂液流量以及支撑剂粒径对螺旋段油管冲蚀磨损率的影响。研究结果表明,压裂液对螺旋段连续管的冲蚀磨损主要发生在油管外侧,除油管入口段外,其余部分冲蚀情况几乎相同;随着压裂液流量及支撑剂质量浓度的增加,螺旋段连续管的冲蚀速率增加,其中压裂液流量对冲蚀速率的影响尤为显著;随着支撑剂粒径的增大,最大冲蚀速率呈现出先减小后增加大的趋势,但是其平均冲蚀速率变化不大。研究结果对连续管压裂技术的现场应用具有一定的指导作用。

In view of few and incomprehensive study on erosion wear characteristic of coiled tubing in fracturing operation, the erosion wear mechanism of spiral section of coiled tubing caused by the fracturing fluid has been sludied using Euler-Lagrange method and Finnie erosion theol. Effects of proppant concentration, fluid flow rate and particle size of the proppant on the erosion wear rate of the spiral section of coiled tubing have been researched using control variable method. The results showed that erosion wear on spiral segment of the coiled tubing caused by fracturing fluid mainly happens on the external side of the tubing. Except for the coiled tubing inlet section, the rest of the erosion situation is ahnost the same. With the increase of the fracturing fluid flow rate and proppant mass concentration, erosion rate of coiled tubing spiral section increases. The effect of the fracturing fluid flow rate is particularly significant. With the increase of proppant particle size, the maximum erosion rate decreases first but then increases, with little variation of the average erosion rate. The study results could provide guidance for the field application of coiled tubing fraeturing technology.