压裂缝高穿层造成底层水上窜的判断方法与原因分析

Identification and Analysis of Channeling Upward of Bottom Water due to Connect the Testing Zone With the Lower Water Zone by Fracturing

对以往压前测试不出水、压后地层不出水与压后地层出水的压力、温度资料进行分析,结合试井、地应力剖面、测井、录井及微地震资料发现,压前测试不出水、压后地层出水的部分原因是地层没有有效的应力遮挡,裂缝缝高扩展到下部水层导致底层水上窜。利用抽汲期间的层内压力—温度曲线进行分析,可判断压后地层出水的原因是否为下部水层上窜。

By analyzing pressure,temperature and some other data of tested wells have been treated by fracturing,including the cases that no water produced before and after fracturing and the cases that no water produced before fracturing but producing water after fracturing,it is found that no water produced before fracturing but producing water after fracturing is partly due to no effective stress barrier exists,so fracturing extends to the lower water zone,and so the bottom water channels upward.Analyzing the pressure and temperature curve can identify this problem.