PQ钻具在寨上矿区地质钻探中的应用

The Application of PQ Drilling Tools for Geological Core Drilling in Zhaishang Mining Area

介绍了PQ型绳索取芯钻具在甘肃寨上矿区地质岩芯钻探中的应用情况。在深孔的开孔阶段或浅部地层施工中,与单管施工工艺相比,该套钻具的优势主要有能够提高钻探效率,保证岩(矿)芯采取率,降低孔内事故发生几率。PQ型钻具在矿区岩金钻探中取得了很好的应用效果。同时,在钻探施工中,PQ钻具也存在一些问题,如钻具笨重,钻杆内易结泥皮,钻具施工深度还不够理想,与钻具配套的扩孔器非正常磨损严重。通过对其应用情况进行分析和总结,并针对存在的问题和缺陷提出了一些改进建议和解决方法,以便该施工工艺在矿区推广应用。

The application effect of PQ drilling tools for geological core drilling in Zhaishang mining area was discussed.Comparing with single tube core barrels used in opening Of a deep hole or construction of shallow department stratum,the PQ drilling tools show obvious advantages：they can improve the penetration rate greatly, assure core recovery percent and reduce the probability of troubles in drill holes at the same time, and have a good application effect in drilling.However,PQ drilling tools also have some disadvantage：they are too heavy, mud cake can easily be formed inside the drilling pipe, construction depth of drilling tools is not so ideal, and the abnormal wear with the matching hole reamer is very serious.We have summarized the application of PQ drilling tools and proposed some suggestions and solutions for the existing defects to popularize the construction technology in mining area.