大岗山水电站深孔帷幕成孔综合钻探技术

Comprehensive Drilling Technology of Deep Hole-forming for Curtain in Dagangshan Hydropower Station

摘要:

与传统提钻取心钻进技术相比，绳索取心技术能有效解决取心质量差、钻孔弯曲、孔内事故多发等技术难题。结合大岗山水电站左岸940 m高程的帷幕成孔钻探工艺，分析钻探施工中存在的问题，采取针对性的工艺改进和优化措施，有效地解决了这些难题，并且在提高工程质量的同时获得了经济效益。

关键词:帷幕成孔;钻探技术;绳索取心

Abstract:

Compared with the traditional core drilling technology by lifting bits, wire-line coring technology can effectively solve the technical difficulties of poor core quality, borehole bending and downhole accidents. According to the drilling technology of hole-forming for curtain at the elevation of 940m on the left bank of Dagangshan hydropower station, the problems in drilling construction are analyzed and effectively solved by process improvement and optimization, the engineering quality is improved with economic benefits.

Key words:hole-forming for curtain; drilling technology; wire-line core drilling