金矿水敏性地层分析及成膜冲洗液应用研究——以松潘县东北寨金矿为例

Analysis of water-sensitive strata and application research of film-forming drilling fluid in Dongbeizhai Gold Mine， Songpan County

摘要:

为解决金矿水敏性地层钻探难度大、钻进效率低和孔内事故多发的难题，以松潘县东北寨金矿为案例，开展了地层分析及成膜冲洗液试验与应用研究。从岩石成分、结构与矿物组成出发，剖析水敏根源，揭示黏土矿物吸水膨胀、水化分散及微观结构变化机理。围绕成膜冲洗液配方，通过室内与现场试验，研究多组对比试验配方，分析不同添加剂的作用效果和不同组合的综合性能，验证了成膜冲洗液的优良性能，合理的组合能协同发挥各材料的优势，稳定的流变性、良好的抑制性和适宜的滤失性等全面的性能可满足复杂工况需求，达到预期的钻探效果。本研究为金矿水敏性地层钻探提供冲洗液理论支撑与技术方案，有助于类似矿区钻探施工效率的提升。

Abstract:

To solve the problems of difficult drilling， low efficiency and frequent downhole accidents in water-sensitive strata of gold mines， this study takes the Dongbeizhai Gold Mine in Songpan County as a case study， conducting strata analysis and experimental research on the application of film-forming drilling fluid . Starting from rock composition， structure， and mineral composition， the root cause of water sensitivity is analyzed， revealing the mechanisms of clay mineral swelling， hydration dispersion， and microstructural changes. Focusing on the formulation of the film-forming drilling fluid ， laboratory and field tests were carried out to study multiple comparative experimental formulations. The effects of different additives and the comprehensive performance of various combinations were analyzed， verifying the superior properties of the film-forming drilling fluid . Reasonable combinations synergistically leverage the advantages of each material， with stable rheology， excellent inhibition， and appropriate fluid loss control， meeting the demands of complex drilling conditions and achieving the desired drilling outcomes. This research provides theoretical support and technical solutions of drilling fluid for drilling in water-sensitive gold mine strata， contributing to improved drilling efficiency in similar mining areas.