内蒙古乌拉山南缘地区破碎复杂地层钻进技术

Drilling method and technology for fractured and complex formation in the southern margin of Wula Mountain， Inner Mongolia

摘要:

内蒙古乌拉山-大青山是我国华北地区重要的金成矿带，其中在内蒙古哈达门沟地区先后发现金矿脉100余条，累计探获金资源储量超过100 t，是华北克拉通北缘西段重要的金矿集区。受该区强烈的构造地质背景影响，区内地层条件复杂，钻探施工中漏失、缩径、坍塌、掉块现象频发，不仅影响施工进度，部分钻孔还因处理不当会造成废孔现象。对此，结合以往施工经验与实际工作需求，根据不同复杂地层的施工情况，总结出一套“大裂隙地层水泥封堵+中裂隙加大钻井液配比剂量+小微裂隙稳速预防+缩径地层大剂量钻井液配比快速穿过”的钻进技术方法，并且在施工项目100ZK5916钻孔的过程中，取得了良好的施工效果。

Abstract:

Wulashan Daqingshan in Inner Mongolia is an important gold metallogenic belt in North China. More than 100 gold veins have been found in Hadamengou area， Inner Mongolia， and the accumulated gold reserves are more than 100 tons. It is an important gold concentration area in the western part of the northern margin of the North China Craton. Affected by the geological background of strong tectonic movement， the strata conditions in the area are complex， leading to some problems such as leaking， shrinking， collapsing and block falling. All these conditions not only affect the drilling progress， but also create waste holes if not properly handled. In view of this， these paper summarizes a drilling technical method of cement sealing of large fracture stratum+increasing drilling fluid dosage ratio in middle fracture stratum+steady speed and prevention in minute fissure+large dosage ratio of drilling fluid and speeding through the shrinking stratum. In addition， these method has achieved good results in 100ZK5916 project.