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国产精细控压钻井系统在蓬莱9井试验与效果分析

Oil Drilling & Production Technology(2011)

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Abstract
精细控压钻井是解决窄密度窗口安全钻井问题的新技术之一,其目的是精确控制环空压力剖面,实现井底压力的恒定控制。介绍了自主研发的PCDS-I精细控压钻井系统装备特点、现场试验与应用情况。该系统整体运行稳定、无故障,经受住了现场工况的考验,实现了恒定井底压力控制和微流量控制,钻进过程中,系统回压控制精度达到0.2 MPa,接单根、起下钻过程中,系统回压控制精度达到0.5 MPa。
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Key words
unbalanced drilling,auto-choke control,influx or loss control,MPD,narrow mud weight window
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