漂浮下套管技术在大港油田埕海一区的应用

Application of Casing Floating Technology in Chenghai Block One of Dagang Oilfield

漂浮下套管技术主要应用于大位移井和水平井中,它是在套管柱下部封闭一段空气或低密度钻井液,以减轻整个管柱在钻井液中的质量,从而达到减小摩阻、将套管顺利下入的目的。主要介绍了漂浮下套管技术原理,套管漂浮组件、漂浮长度的计算和作业程序,以及漂浮下套管技术在大港油田埕海一区大位移井的应用情况。实践证明,漂浮下套管技术是大位移水平井下套管作业的有力保障。

The casing floating technology is used chiefly in extended reach wells and horizontal well.That is a section of air or light density drilling fluid held inside lower casing string to keep casing string floating in section of high deviation well to decrease drag running casing.Working principle of casing floating,flotation package,the calculation of flotation length and operation procedure were introduced.The casing floating technology used in extended reach wells and horizontal wells in Chenghai block one of Dagang Oilfield.The practice showed that it ensured the safety and success of running casing in ERD well operation.