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欠平衡状态可以由自然方式和人工诱导方式产生。介绍了国外向钻井液中注气的4种方式和欠平衡钻井完井液的选择规则,提出在优选完井液时,要充分了解储层特点和钻井情况,解决好井眼稳定性、水层、酸气、井眼形状等问题,介绍了欠平衡钻井地面控制系统并对欠平衡钻井工艺提出了相应的要求。
Underbalanced state can be generated by natural and artificial induction. This paper introduces four ways of injecting gas into drilling fluid abroad and the selection rules of underbalanced drilling and completion fluid. It is suggested that when selecting well fluid, it is necessary to fully understand reservoir characteristics and drilling conditions, and to solve well borehole stability, , Sour gas, borehole shape and other issues, introduced underbalanced drilling ground control system and put forward corresponding requirements for underbalanced drilling process.