遵义龙洞地下河系统污染通道识别钻探技术  

Precision drilling technology for contaminated channels of Longdong underground river system in Zunyi City

作　　者：赵华宣[1] 李强[1,2] 江峰 陈涛 陈浩[1] 贾玉川[1] 易世友[1] ZHAO Hua-xuan;LI Qiang;JIANG Feng;CHEN Tao;CHEN Hao;JIA Yu-chuan;YI Shi-you(No.114 Geological Brigade of Bureau of Geology and Mineral Exploration and Development of Guizhou Province,Zunyi,Guizhou 563000,China;College of Resources and Environmental Engineering,Guizhou University,Guiyang,Guizhou 550000,China)

机构地区：[1]贵州省地质矿产勘查开发局114地质大队,贵州遵义563000 [2]贵州大学资源与环境工程学院,贵州贵阳550000

出　　处：《地下水》2024年第6期134-138,共5页Ground water

基　　金：贵州省科学技术厅重大科技成果转化项目:“地下河走向物理化学探测及数字地图绘制技术集成与应用”(黔科合成果[2023]重大006);贵州省地质矿产勘查开发局科研项目:“贵州岩溶地下水环境污染勘查与地学治理关键技术研究”(黔地矿科合(2022)重大2号)。

摘　　要：龙洞地下河系统发育于西南裸露型岩溶山区,水文地质条件复杂、岩溶裂隙/溶洞发育,受污染地下河系统通道隐蔽性强、精准识别难度大、勘察钻孔精度要求高。受地形地貌切割及节理裂隙影响、局部10 m以上大型溶洞或溶蚀破碎带密集发育。钻探成孔揭露和识别污染通道遇严重掉块垮塌、钻孔轴线偏移及钻杆和套管易拆断等难题。通过优选钻进工艺、长粗径钻具与轻压慢转、柔性/楔型连接长套管穿越封隔大溶洞等有效技术措施,保证了强岩溶区钻孔精度和成孔率,为测井、示踪试验及水样采集等工作提供可精准揭露污染源的钻孔通道,确保污染通道精准识别。对类似地层污染通道精准识别的钻探施工有重要参考和借鉴意义。The Longdong underground river system is located in the exposed karst mountainous area of southwest China, with complex hydro-geological conditions and the development of karst cracks and caves. The channels of the contaminated underground river system are highly concealed, and the accurate identification is difficult, and the accuracy of exploration and drilling is high. Affected by topography cutting and joint fissure, local large karst caves over 10m or dissolution fracture zones are densely developed. After drilling holes to expose and identify contaminated channels encountered serious problems such as block collapse, borehole axis deviation and easy disassembly of drill pipe and casing. Effective technical measures such as optimal drilling technology, long and thick diameter drilling tools and light pressure and slow rotation, flexible and wedge connection long casing through the sealing of large karst holes are adopted to ensure the drilling accuracy and porosity in strong developed karst areas, and provide drilling channels that can accurately expose pollution sources for logging, tracer testing and water sample collection, and ensure accurate identification of pollution channels. It has important reference and significance for the accurate identification of similar formation pollution channels in drilling construction.

关 键 词：岩溶山区 地下河系统污染 柔性/楔型连接套管 大溶洞穿越 通道精准识别 

分 类 号：P641.72[天文地球—地质矿产勘探] P641.134[天文地球—地质学]