YS139H1平台井上部复杂地层优快钻井关键技术

Key technologies of optimal and fast well drilling for upper complex formation of YS139H1 platform well

YS139H1平台位于四川叙永工区,存在浅表层溶洞、裂隙发育、破碎带多,上部地层垮塌、漏失严重。采用稠浆、复合堵漏浆、凝胶及水泥堵漏等效果不佳,加之山区水源缺乏,不能连续强钻,卡钻故障频发,严重影响施工进度。通过空气钻、穿心跟管钻进、常规钻头+空气钻井和充气雾化钻井等技术的综合应用,形成了针对YS139H1平台上部复杂地层的优快钻井关键技术。该技术在YS139H1平台4口井应用,一开施工时间由原来71 d,逐步缩短至13.90 d,提速效果明显。

YS139H1 platform is located in the Xuyong Block,Sichuan.There are many shallow surface karst caves,fractures,and broken zones,resulting in serious collapse and leakage of the upper stratum.By using thick slurry plugging,compound plugging slurry,gel plugging,and cement plugging,the effect is not effective.In addition,because of the lack of water sources in mountainous areas,it can not be continuously drilled and stuck drilling failures happened frequently,which seriously affects the construction progress.Through the comprehensive application of technologies such as air drilling,casing while drilling,conventional PDC bit combined with aerated drilling,and mist drilling,the key technologies of optimal fast drilling have been formed for the complex formation on the upper part of the YS139H1 platform.This technology was applied in 4 wells of the YS139H1 platform,and the construction time was gradually shortened from 71 days to 13.90 days,and the effect of increasing drilling speed was obvious.