埕北244井在施工古生界井段时发生了井漏、井涌及上吐下泄等复杂情况。通过对井下情况的认真分析,采用了欠平衡钻井技术,顺利地完成了该井的施工任务,为海上施工此类井总结了宝贵的经验。本文主要是对欠平衡钻井技术在现场的应用情况做一介绍。 In the case of the Beibei 244 well, complicated situations such as well leakage, kick in and overpouring occurred during the construction of the Paleozoic well section. Through careful analysis of the underground conditions, the use of underbalanced drilling technology, the successful completion of the well’s construction tasks, for the construction of such wells at sea, summed up the valuable experience. This article mainly introduces the application of underbalanced drilling technology in the field.