压裂液返排试验及返排制度优化研究

Study of Fracturing and Flowback Experiment and Flowback System Optimization

试验结果显示,合理的返排液体粘度应小于5m Pa·s;支撑剂回流主要发生在排液初期;初期合理的返排速度控制在0.2m3/min,控制油嘴不大于3mm;作用在支撑剂有效应力大于6m Pa后,返排出砂状况明显降低;若压裂过程加入纤维,可更有效控制支撑剂回流。试验结果对压裂液返排施工具有很好的指导意义。

the test results show that the flowback liquid viscosity should be less than 5mPa · s reasonable; proppant backflow occurs mainly in the discharge period; early reasonable return control in 0.2m3/min speed control nozzle is not greater than 3mm; role in supporting agent effective stress is greater than 6mPa, the reverse flow condition of sand fracturing if reduced obviously; the process of adding fiber, can effectively control the backflow of proppant. The experimental results have a good guiding significance for the flowback of fracturing fluid.