在钻探工艺中，水泥灌注是克服复杂地层的漏、涌、坍、掉、超径、固管等一系列障碍的有效措施；近年来，有关这方面的讨论和研究正步步深入，并普遍地取得了显著的成效。但是，总的看来，成功率仍然不能令人满意，一般仅在60～80％。追究失败的原因，以往似乎偏重于水灰比、替浆量、灌注工艺等问题。当然，这方面的原因确实不少，是不可忽视的。多次实践表明，地层压力是决定水泥灌注成败的关键因 In the drilling process, cement pouring is an effective measure to overcome a series of obstacles such as leakage, flooding, slumping, dropping, over-diameter and tube-fixing of complex strata. In recent years, discussions and researches in this area are going deeper and generally Achieved remarkable results. However, in general, the success rate is still unsatisfactory, generally only 60 to 80%. Investigate the reasons for the failure, in the past seems to be biased in favor of water-cement ratio, for the amount of pulp, perfusion process and other issues. Of course, there are indeed many reasons for this. We can not ignore this. Many times practice shows that formation pressure is the key factor that determines the success or failure of cement pouring