岩心钻探漏失地层水泥堵漏技术的实例分析与研究

Case study and analysis of cement plugging technology for core drilling in lost circulation formation

摘要:

本研究以山东招平带南段及外围金多金属资源调查评价项目中的ZK407孔1000 m岩心钻探为例，分析了胶东地区断裂构造发育背景下，深部金矿床的钻探技术难题。钻孔位于招平断裂带南端南墅镇青山村，以破碎带蚀变岩型和石英脉型金矿床为主。在钻探过程中，遇到了地下水压力失衡、孔内坍塌掉块夹钻、严重漏失和烧钻等事故。为了解决这些技术难题，采取了套管隔离、调整冲洗液性能护壁、复合材料堵漏、顶漏钻进和水泥堵漏等措施。这些措施有效地解决了技术难题，实现了预期目标，为该区深部矿产成矿理论研究及资源勘查提供了合格的地质钻孔和实物岩心资料。本研究结果对于类似地质条件的钻探工程具有重要的参考价值。

Abstract:

In this study， the 1000m core drilling of hole ZK407 in the southern and peripheral gold polymetallic resources investigation and evaluation project in Shandong Zhaoping Belt is taken as an example to analyze the technical difficulties of deep gold deposit drilling in Jiaodong area under the background of fault development. The borehole is located in Qingshan village， Nanshu Town， southern end of Zhaoping fault zone. The gold deposit is mainly altered rock type and quartz vein type located in the fracture zone. In the process of drilling， some accidents occurred， such as groundwater pressure imbalance， hole collapse and block clamping， serious leakage and drilling burning. In order to solve these technical problems， some measures have been taken， such as casing isolation， adjusting mud performance， composite material plugging， top leak drilling and cement plugging. These measures have effectively solved the technical problems， achieved the expected goals， and provided qualified geological drilling and physical core data for the research of deep mineral mineralization theory and resource exploration in this area. The results of this study have important reference value for drilling engineering under similar geological conditions.