吉林油田致密油水平井优快钻井完井技术

Optimized Drilling and Completion Technology for Horizontal Wells in Tight Oil Reservoirs in the Jilin Oilfield

崔月明 史海民 张清

CUI Yueming SHI Haimin ZHANG Qing

中国石油吉林油田分公司钻井工艺研究院，吉林松原 138000

Drilling Technology Research Institute, PetroChina Jilin Oilfield Company, Songyuan, Jilin, 138000, China

吉林油田致密油水平井钻井成本高、钻井周期长、机械钻速慢，井眼易失稳，且摩阻和扭矩大、套管下入困难，针对这些问题，开展了二开长水平段水平井优快钻井完井技术研究。为了从设计源头降低钻井成本、缩短钻井周期，将前期采用的三开小井眼井身结构简化为浅下表层套管的二开井身结构，节省了一个开次的中完时间；同时，研究形成了以井眼轨道优化设计、低滤失强抑制聚合物钻井液、近钻头地质导向工具、个性化PDC设计和漂浮下套管为核心的优快钻井完井技术。上述优快钻井完井技术在吉林油田180口致密油水平井进行了现场应用，应用井平均井深3 449.00 m，平均水平段长1 189.00 m，套管安全下入率100%，固井合格率100%，油层钻遇率提高20.2百分点，钻井周期缩短44.2%，钻井成本降低40.7%，取得了显著效果。研究结果表明，优快钻井完井技术可实现吉林油田致密油低成本高效开发，并且对致密气、页岩油等其他非常规油气藏的开发具有借鉴作用和参考价值。

In view of the problems of high cost, long drilling cycle, slow ROP, unstable borehole wall, high friction and torque, and difficult casing running in tight oil reservoirs of Jilin Oilfield, this paper studies the optimized drilling and completion technology for for horizontal wells with two-section casing program and long horizontal section. In order to reduce the cost and shorten the drilling cycle from the engineering design, the three-section casing program used in the early stage was simplified to a two-section one with shallow surface casing, and one section completion time was saved. At the same time, the technical measures such as optimal design of borehole trajectory, low-filtration strength suppression polymer drilling fluid system, near-bit geological guiding tool, customizing the PDC bit design, floating casing and cementing and so on were formed.The technical measures were applied in 180 horizontal wells in tight oil reservoirs of Jilin Oilfield, with an average well depth of 3449 m, an average horizontal length of 1189 m, a casing safety entry rate of 100%, a cementing qualified rate of 100%, increasing in reservoir drilling rate by 20.2 percentage point, shortening drilling cycle by 44.2% and reducing investment costs by 40.7%. The research results achieve the goal of low cost and high efficiency development of tight oil reservoirs in Jilin Oilfield, and can provide a reference for the development of unconventional reservoirs such as tight gas and shale oil.

https://doi.org/10.11911/syztjs.2020123