全漂浮旋转下套管技术在大位移井中的应用

The Application of Rotary Casing Running Technology with Full-floating in Extended Reach Wells

摘要: 以南海东部番禺油田大位移井全漂浮旋转下套管的成功作业为例，通过分析大位移井在长裸眼井段的Φ244.5 mm套管下入过程中面临井斜大、裸眼段长、夹层多，井壁摩阻大、易压漏地层等问题及难点，阐述了引入全漂浮旋转下套管技术的必要性，介绍了该技术的工作原理和主要设备，分析了该技术的作业特点及应用效果，结果表明：全漂浮旋转下入套管柱时，增加大钩载荷，顺利通过遇阻点，安全平稳过断层，未发生漏失和压差卡钻等复杂情况，长裸眼井段的Φ244.5 mm套管全部成功下至设计深度，对大位移井长裸眼井段套管下入技术的提高有指导作用。

Abstract: By taking the rotary casing running technology with full-floating in extended reach wells (ERWs) of Panyu Oilfield in the east of South China Sea, this paper analyzed the problems and difficulties in the process of Φ244.5 mm casing running in long open hole section, such as large deviation, long open hole section, more intercalation, high wall friction, easy formation leakage, and so on. The necessity of introducing the full floating rotating casing technology was expounded, the working principle and main equipment of the technology were introduced, and the operation characteristics and application effect of the technology were analyzed. The results indicate that when full-floating and rotation casing is run into the casing string, the load of hook is increased, the resistance point is passed smoothly, the fault is passed safely and smoothly, the lost circulation and differential pressure sticking are not occurred, and the Φ244.5 mm casing in the long open hole section is successfully lowered to the design depth. It can be used to improve the casing running technology of long open hole in extended reach well.