东北寨金矿复杂地层综合钻探施工技术

Comprehensive drilling construction technology for complex strata in Dongbeizhai Gold Mine

摘要:

东北寨金矿地处松潘地震带，以强水敏性千枚岩地层为主，地层条件极为复杂，坍塌、缩径、掉块、岩心采取率低是该区域岩心钻探面临的主要问题，极大的影响了钻探施工效率和成孔。本文针对该项目地层特性，以及施工设备全部为全液压钻机的特点，通过广泛深入的探讨研究，在总结矿区原来施工经验教训的基础上，通过优化设备性能，提升设备适应性，采用多径成孔和对地层适应性好的抑制剂冲洗液体系，配合跟管钻进、无泵干捞和金刚石绳索三层管取心等综合钻探施工技术，提高了施工效率和质量，取得了良好的效果。该综合钻探施工技术，对类似川西北区域强水敏性千枚岩复杂地层施工，全液压钻机高效使用，有较好的推广应用价值。

Abstract:

The Dongbeizhai Gold Mine is located in the Songpan seismic belt， dominated by strongly water-sensitive phyllite strata with extremely complex stratigraphic conditions. Collapse， diameter reduction， rockfall， and low core recovery are the main problems faced by core drilling in this area， greatly affecting the drilling efficiency and hole formation.This article aims to address the formation characteristics of the project and the characteristic of the construction equipment， which is all fully hydraulic drills. Through extensive and in-depth research， based on the lessons learned from previous construction experience in the mining area， by optimizing equipment performance， improving equipment adaptability， using multi-diameter drilling and a inhibitor flushing fluid system with good adaptability to the formation， combined with comprehensive drilling techniques such as follow-up drilling， pump-free dry fishing， and diamond wireline three-layer tube coring， the construction efficiency and quality have been improved， and good results have been achieved. This comprehensive drilling construction technology has good promotion and application value for the efficient use of full hydraulic drills in the construction of complex strata such as strongly water-sensitive phyllite in the northwest region of Sichuan.