连续循环钻井系统的发展与应用

DEVELOPMENT AND APPLICATION OF CONTINUOUS CIRCULATION DRILLING SYSTEM

连续循环系统(CCS)可以在钻井过程中增强对当量循环密度的控制,提高在狭窄压力窗口下的有效钻井能力,是近年发展起来的一项钻井新技术。为此,对连续循环系统的组成和工作原理进行了详细的论述,并分析了连续循环钻井的优点与应用领域,连续循环设备的装配与运行需考虑与常规钻井设备及操作的兼容性,尤其是钻具接头在高速流动环境下的腐蚀,闸板密封胶芯的磨损与更换等。连续循环系统有利于大斜度井、水平井以及深水钻井,便于狭窄钻井液密度窗口井和压力敏感井的钻进,有利于促进欠平衡钻井技术的发展。

The Continuous-Circulation System(CCS)can improve the control of equivalent circulation density,and enhance the drilling capacity.The paper presented the composition and working operation of CCS,analyzed the advantages and application field of CCS.The assemblage and operance of CCS must take into account the compatibility with conventional drilling equipment and operation.The CCS was propitious to high-inclination well,horizontal well and deep water drilling.