介绍了四川早期的欠平衡钻井实践 ,分析了四川开展欠平衡钻井的可能性与必要性。指出目前在四川地区开展欠平衡钻井 ,应根据四川的实际情况 ,做到少投入 ,见效快。同时 ,提出边喷边钻、控制井口回压和调整钻井液密度等工艺技术 ,正是目前四川开展欠平衡钻井的主要方式。 The practice of underbalanced drilling in the early stage of Sichuan Province was introduced, and the possibility and necessity of underbalanced drilling in Sichuan were analyzed. It is pointed out that underdevelopment of underbalanced drilling in the Sichuan area should be based on the actual conditions in Sichuan and to achieve less investment and quick results. At the same time, proposed side edge drilling, control wellhead back pressure and adjust the drilling fluid density and other technology, it is the main way to carry out underbalanced drilling in Sichuan.