崤山地区松散破碎地层护孔技术创新与现场应用

Innovative Hole Protection Technology and Field Application for Loose and Broken Strata in the Xiaoshan Mountain Area

摘要:

崤山地区作为河南省新一轮找矿突破战略行动重点区域，钻探施工中面临的松散破碎地层孔壁失稳、岩心采取率低、钻井液漏失严重等技术难题，开展了护孔技术系统性研究。通过室内试验、数值模拟与现场验证相结合的方法，研发了多套防漏堵漏钻井液体系，优化了取心工具结构，建立了颗粒封堵数值模拟指导方法。现场应用结果表明：岩心采取率从60%提高至95%以上，钻速由1.5m/h提升至2.0m/h，综合成本下降 17.5%，有效解决了松散破碎地层钻探技术瓶颈，为同类地区找矿钻探提供了工程技术支撑。

Abstract:

As a key area of the new round of strategic mineral exploration breakthrough initiative in Henan Province, the Xiaoshan Mountain Area faces prominent technical challenges in drilling construction, including borehole wall instability in loose and broken strata, low core recovery rate, and severe drilling fluid loss. A systematic research on hole protection technology was therefore carried out. By adopting a combined method of laboratory tests, numerical simulation and field verification, multiple sets of lost circulation prevention and plugging drilling fluid systems were developed, the structure of coring tools was optimized, and a numerical simulation guidance method for particle plugging was established. Field application results show that the core recovery rate has increased from 60% to over 95%, the drilling rate has risen from 1.5 m/h to 2.0 m/h, and the comprehensive cost has decreased by 17.5%. The research effectively breaks the technical bottleneck of drilling in loose and broken strata, and provides technical engineering support for mineral exploration drilling in similar areas.