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欠平衡钻井技术以其优越的钻探效果已被业内人士所认可,实现全过程欠平衡钻井技术已成为石油钻井工作者所追求的目标。实践证明,井下隔离法是实现全过程欠平衡钻井作业最直接也是最有效的技术手段。井下封井器技术是隔离法技术的具体体现,对该技术的工作原理及现场应用情况进行了简要阐述,并对井下封井器的下入深度进行了公式推导。
Underbalanced drilling technology with its superior drilling effect has been recognized by the industry, the whole process of under-balanced drilling technology has become the goal pursued by oil drilling workers. Practice has proved that the underground isolation method is the most direct and effective technical means to achieve the entire process of under-balanced drilling operations. Underground wellbore technology is a concrete manifestation of the isolation technology. The working principle of the technology and field application are briefly described. The formula of downhole depth of downhole wellbore is derived.