∅139.7mm套管开窗侧钻井优快钻井技术

Fast and Optimized Drilling Technology with ∅139.7mm Casing Sidetracking

套管开窗侧钻井技术可以使深部套管损坏的油、水井得到修复再利用,但由于开窗侧钻井井眼小,所用钻头、钻具、工具受到限制。同时环空间隙小,对钻井速度及施工质量有很大的影响。通过优选钻头不但提高了钻井速度同时增大了环空间隙,解决了小井眼施工中环空返速低的问题,也为后期完井作业奠定了基础。通过优化钻具结构,使用防卡钻具组合提高了防卡能力。在轨迹控制方面运用无线随钻测量技术实现了随钻跟踪,进一步提高了井下安全。针对以往小井眼固井难点,研究适合小井眼固井的低密度早强水泥浆,解决了固井水泥低返以及固井过程中蹩压的问题,使小井眼固井质量都有了很大提高。通过以上技术应用为侧钻井的进一步发展找到一种新的方法。

Casing sidetrack drilling technology could make the repairing and reuse of the deep casing damaged oil wells.But due to the small holes of sidetracking drillings,the bit and drilling tools and downhole tools were restricted.Also the small annular space,drilling speed and operation quality were greatly influenced.By choosing the bits it not only improved the drilling speed and increased the annular clearance,the problem of low annular speed in operation was solved,also it laid a foundation for well completion at the late stage.By optimizing the drilling tool structure,an anti-stuck BHA was used to improve the anti-stuck ability.In the trajectory control,a wireless instrument was applied to realize tracking while drilling,it further enhanced the downhole safety.In allusion to the difficulty in well completion in the past,low density and early and strong slurry for slim hole cementing was studied,the problem of low backflow and pressure-bouncing of cementing was solved,the cementing quality was greatly improved.The technology provides a new method for the further development of lateral drilling.