压裂井极限抽汲返排率的确定

本文利用离子浓度组成分析的方法，计算了大庆油田试油井试油求产阶段的压裂液抽汲返排率，定义并得出了压裂液的极限抽汲返排率。结果表明：在抽汲返排水性稳定以后，压裂液的返排率为75%左右，即有25%左右的压裂液残留在地层中无法返排出来；在抽汲排液阶段，压裂液的抽汲返排率一般低于15%，压裂液的极限抽汲返排率为15%，即从地层中最多能抽汲出15%的压裂液。

The Determine of Limited Swabbing Flowback Rate of Fracturing Wells

In this paper, the swabbing flowback rate of fracturing fluid in the stage of well testing in Daqing Oilfield can be calculated by using the method of analyzing Ion concentration. The definition of limited swabbing flowback rate of fracturing fluid is also exhibited here. The results show that the fracturing fluid flowback rate is 75% when the Ion concentration of the water which is flowed back from the reservoir. That is to say that 25% of the quantity of fracturing fluid is detained in the reservoir. The swabbing flowback rate is always less than 15%. So the limited swabbing flowback rate is 15%