滴西火山岩复杂地层水平井钻井技术

Horizontal well drilling technology for Dixi volcanic complex formation

范志国 田军伍 郭建良 张宏阜

FAN Zhiguo TIAN Junwu GUO Jianliang ZHANG Hongfu

西部钻探定向井技术服务公司，新疆克拉玛依　834000

Directional Well Technology Service Company, Western Drilling and Exploration Company, Karamy 834000, China

滴西火山岩气田地质结构复杂，白垩系和侏罗系的疏松地层易井漏；三叠系、二叠系的泥岩和目的层石炭系夹杂的炭质泥岩、煤层易坍塌；石炭系垂直裂缝发育，易井漏；钻井液中堵漏介质影响MWD信号的传输、给轨迹控制造成困难；气层分布复杂，水平段钻进时需要大幅度调整轨迹。为此，采用了一系列的技术措施：防漏堵漏技术；漏失井段轨迹控制技术；斜井段井壁坍塌机理描述、防塌措施；斜井段通井划眼技术；曲折水平段降摩阻技术等。经现场应用这些技术，加快了该区水平井施工进度，为今后同类型井钻进提供了经验。

The geology structure of Dixi volcanic gas field is complex. Cretaceous and Jurassic unconsolidated formation tend to loss circulation, and Triassic and Permian clay formation and Carboniferous carbargilite and coal bed tend to collapse. Carboniferous formation is developed with vertical fractures, so it tends to loss circulation. The sealing agents in drilling fluid affect the transmission of MWD signals, which makes difficulties to trace control. The gas bearing layer distribution is complex, so it need adjust trajectory significantly when horizontal well is penetrated. Therefore, a series of technical treatments are taken to deal with the issues, including leak protection and sealing techniques, leaking section trace control technique, wellbore sloughing mechanism description for deviated well section and the anti-slough treatment, deviation section drifting and reaming techniques, winding horizontal well friction reducing technique, etc. Through the application of these techniques in field, the horizontal well drilling process is speeded up, which supplies an experience for the similar drilling operations.