深水钻井礁灰岩地层失返性井漏处理与认识

Treatment and Recognition of Lost Circulation in Reef Limestone Formation of Deep Water Drilling

深水钻井失返性井漏处理难度大、周期长、经济成本高,如处理不当,极易恶化造成卡钻、井塌、井喷等事故。为提高深水钻井失返性井漏处理效率,该文剖析了南海深水井钻井期间发生失返性井漏的根本原因,提出了一种复合堵漏水泥浆处理失返性井漏的新方法,分析了该复合堵漏水泥浆的堵漏作用机理,印证了该方法的可靠性,最终形成处理礁灰岩失返性井漏的工程作业经验成果,并针对性提出防止井漏事件进一步恶化成卡钻、井塌、井喷事故的技术措施,为后续处理及预防深水失返性井漏提供参考和启示。

The treatment of lost circulation in deep water drilling is difficult,long cycle and high economic cost.Improper treatment can easily lead to accidents such as sticking,wellbore collapse and blowout.In order to improve the treatment efficiency of lost circulation in deep water drilling,this paper analyzes the root causes of lost circulation during deep water drilling in South China Sea,and proposes a new method of treating lost circulation with composite plugging cement slurry.The plugging mechanism of the composite plugging cement slurry is analyzed,and the reliability of the method is verified.Finally,the engineering operation experience of dealing with lost circulation in reef limestone is formed,and the technical measures to prevent further deterioration of lost circulation events into stuck drilling,well collapse and blowout accidents are put forward,which provides reference and enlightenment for subsequent treatment and prevention of lost circulation in deep water.