汶川地震断裂带科学钻探项目WFSD-4S孔取心钻进技术

汶川地震断裂带科学钻探项目WFSD-4S孔是为了进一步了解汶川地震主滑移带情况,取得更为全面完整的地质资料,于南坝地区四号孔附近靠近地表破裂带的位置所补充施工的穿过汶川地震主滑移带的浅孔。主要介绍了汶川地震断裂带科学钻探项目WFSD-4S孔针对钻孔地质条件复杂、孔内岩心采取率低等难题所采用的关键工艺和技术措施,并对其应用成果进行了分析和总结,通过从地层情况、施工过程、取心钻具、冲洗液技术以及事故处理等几个方面的详细论述,为以后对复杂地层选用合理的取心技术提供重要参考依据。

Core Drilling Technology Used in Borehole WFSD-4S of Wenchuan Earthquake Fault Scientific Drilling Project

The borehole WFSD-4S of Wenchuan earthquake fault scientific drilling project is a shallow supplemented hole through Wenchuan earthquake main slip band for further understanding the main slip of the Wenchuan earthquake to get more comprehensive drilling data, which is located near the surface rupture zone by the fourth hole in the Nanba region. The paper introduces the key technology and measures applied in the borehole WFSD-4S of Wenchuan earthquake fault scientific drilling project for the difficulties of complex geological conditions and low core recovery. The results of its application were analyzed and summarized; the detailed discussion was made on the formation conditions, the construction process, coring drilling tools, drilling fluid technology and accident treatment, which will provide important reference for the selection of reasonable coring technology in future complex formation drilling.