循环推送下套管系统的研制

Development of a circulating pushing casing running system

赵传伟 孙家祥 兰恭涛 吴仲华 陈勇 周志刚 刘晗

ZHAO Chuanwei SUN Jiaxiang LAN Gongtao WU Zhonghua CHEN Yong ZHOU Zhigang LIU Han

中国石化胜利石油工程有限公司钻井工艺研究院 中国石化胜利石油工程有限公司黄河钻井总公司

Drilling Technology Research Institute of Sinopec Shengli Oilfield Service Corporation, Dongying 257000, Shandong, China Yellow River Drilling Corporation of Sinopec Shengli Oilfield Service Corporation, Dongying 257000, Shandong, China

如何将套管安全下到预定位置是大位移井、分支井以及丛式井等复杂结构井完井面临的技术难题之一，为此，研制了循环推送下套管系统。该系统能够自动连接套管、建立钻井液循环、旋转套管柱以及在套管柱末端产生轴向振荡力，减小套管下入摩阻，同时可通过切削井壁清除砂桥、台阶等。介绍了该系统套管循环旋转装置和套管推送下入装置的结构和工作原理，采用数值模拟方法分析了套管循环旋转装置的卡瓦承载能力。室内试验表明，套管循环旋转装置工作可靠，可承受轴向载荷2 400 kN、扭矩30 kN · m，密封承压35 MPa，设计排量条件下，套管推送下入装置压降2.7 MPa、振荡力41 kN。现场试验表明，该循环推送下套管系统能够有效提高套管下入的安全性，可进一步推广应用。

How to safely run the casing to the predetermined position is one of the technical challenges in completion of structurally-complex wells such as extended-reach wells, branch wells and cluster wells. A circulating pushing casing running system (with mud circulation and pushing forces) was developed. The system can automatically connect casing, establish drilling fluid circulation, rotate the casing string and generate axial oscillation force at the end of the casing string to reduce casing running friction. Moreover, it is capable of removing sand bridges and steps by cutting the borehole wall. This paper introduces the structure and working principles of the key devices of the system, namely the casing circulating rotating device and casing pushing running device. Numerical simulation and laboratory testing were performed to analyze the slip load-bearing capacity of the casing circulating rotating device. The results show that the casing circulating rotating device works reliably, and can bear an axial load of 2400 kN, a torque of 30 kN · m and sealing pressure of 35 MPa. Under the designed pump rate, the pressure drop through the casing pushing running device is 2.7 MPa, and the oscillation force is 41 kN. Field testing shows that the circulating pushing casing running system effectively improves the safety of casing running.

10.13639/j.odpt.202207050