无固相冲洗液在变质岩系复杂地层绳索取心钻进中的应用

辽宁省北镇市杜屯地区超大型石墨矿处于变质岩系中,在勘查过程中分析了该区变质岩系复杂地层的成因及特点,采用了绳索取心与无固相冲洗液钻进工艺,并分析了冲洗液对石墨岩矿层稳定性的影响,对冲洗液体系进行了优化,分析了冲洗液的护壁作用机理。同时对钻进过程中的技术应对措施进行了优化,解决了绳索取心钻进过程中钻杆结泥皮及技术套管的使用等问题,顺利地完成了矿床的勘探工作,取得了良好的技术经济成果。

Application of Solid-free Flushing Fluid for Wire-line Coring in Complex Metamorphic Rocks Formation

A super graphite deposit in Beizhen Dutun of Liaoning Province exists in metamorphic series. The genesis and characteristics of complex metamorphic formation were analyzed in this regional exploration and wire-line coring drilling and solid-free flushing fluid drilling technologies were used. By the analysis on the effect of flushing fluid on the stability of graphite rock seams, the flushing fluid system is optimized; the wall protection mechanism of flushing fluid is also analyzed and the technical countermeasures in drilling process is optimized to solve the problems of slurry cake and intermediate casing application. The deposit exploration is successfully completed with good technical and economic results obtained.