电动压裂作业船支撑剂气力输送试验及弯头磨蚀寿命研究

Study on Proppant Pneumatic Transportation Experiment and Elbow Abrasion Life of Electric Fracturing Operation Ship

为了验证压裂支撑剂密相气力输送的可行性,搭建了压裂支撑剂气力输送试验台架,开展了支撑剂密相气力输送试验。采用CFD软件的DPM模型对多工况下的支撑剂气力输送进行了气固两相流分析,并对输送管线各弯头的磨蚀寿命进行了预测。研究结果表明:压裂支撑剂在直管道中能顺利通过,在弯头处具有一定的冲击振动,整个管线未出现堵塞现象,表明支撑剂密相气力输送可行;支撑剂在弯头处向外打旋,随着支撑剂速度的增大,打旋幅度越大,且管线弯头的最大磨蚀率显著增大,磨蚀率较大位置均在弯头入弯15°左右位置;管线中各弯头磨蚀率具有一定的差异性,为不同材质弯头的选择提供了理论依据;仿真分析中工况2最贴近实际工况,弯头6的磨蚀情况最严重,磨蚀寿命为15159 h,按照实际作业工况进行计算,其工作寿命可达到38.3个月,与试验结果相吻合,表明弯头数值仿真寿命预测具有一定的可靠性。

In order to verify the feasibility of dense phase pneumatic transportation of fracturing proppant,a fracturing proppant pneumatic transportation experimental bench was built,and the proppant dense phase pneumatic transportation experiment was carried out.The gas-solid two-phase flow of proppant pneumatic transportation under multiple working conditions was analyzed by using the DPM model of CFD software,and the abrasion life of each elbow of the transmission pipeline was calculated and predicted.The results show that the fracturing proppant can pass through the straight pipe smoothly and has a certain impact vibration at the elbow,but the whole pipeline is not blocked,indicating that the dense phase pneumatic transportation of proppant is feasible,the proppant swirls outward at the elbow.With the increase of proppant speed,the greater the spinning range is,and the maximum abrasion rate of the pipeline elbow increases significantly.The positions with a high abrasion rate are about 15°into the elbow;the abrasion rate of each elbow in the pipeline is different,which provides a theoretical basis for the selection of elbows of different materials.In the simulation analysis,the abrasion of elbow 6 under experimental conditions is the most serious,and the shortest abrasion life is 15159 hours.According to the actual operating conditions,its working life can reach 38.3 months,which is consistent with the experimental results,indicating that the numerical simulation life prediction of the elbow has certain reliability.