大庆古龙页岩油水平井钻井技术

Drilling Technologies for Horizontal Wells of Gulong Shale Oil in Daqing

大庆油田古龙页岩油区块水平井存在井壁易失稳、井眼轨迹控制难度大、井眼清洁困难和固井质量得不到保证等钻井技术难点。为克服上述技术难点,进行了井台井组和井身结构优化、钻井参数优选、井眼轨迹控制、钻井液优选和固井施工优化等技术研究,形成了适用于大庆古龙页岩油水平井的钻井技术。古龙页岩油区块的10口井应用了该技术,钻井过程中未出现井壁失稳的情况,固井质量得到提高,与该区块未应用该技术的水平井相比,平均机械钻速提高了79.91%,在平均水平段长度增加265.13 m的前提下,平均钻井周期缩短了40 d。现场应用结果表明,该技术可以解决古龙页岩油水平井存在的钻井技术难点,为古龙页岩油的高效勘探开发提供技术支持。

Some technical challenges were encountered while drilling horizontal wells in the Gulong shale oil block of Daqing Oilfield,such as wellbore instability,difficulties of wellbore trajectory control and wellbore cleaning,and uncertain cementing quality,etc.Therefore,the research on technologies such as the optimization of well platform,well group,and casing program,selection of drilling parameters,wellbore trajectory control,drilling fluid optimization,and cementing optimization were carried out.The drilling technologies suitable for horizontal wells of Gulong shale oil were formed.The technologies have been applied to 10 wells in Gulong shale oil block.No wellbore instability was observed during drilling,and the cementing quality was improved.Compared with horizontal wells in the block without these technologies applied,the average rate of penetration was increased by 79.91%,and the average drilling duration was shortened by 40 days while the average length of the horizontal section was increased by 265.13 m.The field application results show that the technologies can solve the technical difficulties of drilling in horizontal wells of the Gulong shale oil,and provide technical support for its efficient exploration and development.