长期以来,人们在承压砂砾石含水层中钻井,总结了许多成功的经验,但由于深部观测技术上的局限,单纯依靠岩芯分析地层特点来判断孔内情况,这样就往往由于认识上的片面性,使技术措施不力导至井壁严重坍塌掉块,达不到设计目的。经验告诉我们,除了注意观察岩芯之外,还耍根据井内水力动 For a long time, people have drilled wells in confined sand and gravel aquifer and summed up many successful experiences. However, due to the limitations of deep observation techniques, the determination of pore conditions based solely on the characteristics of the core analysis of the stratum often leads to the understanding of One-sidedness led to poor technical measures leading to a serious collapse of the block wall, failing to achieve the designed purpose. Experience tells us that in addition to observe the core, but also according to the well hydraulic power