论文部分内容阅读
我公司从勘探金属矿转为煤田普查勘探工作。面对煤田钻进的三大技术关键（取心、护孔堵漏，封孔）开展了一系列试验、总结工作。使我们认识最深的是裸孔钻进工艺，现将我们的几点体会简述如下。一、必须不下或少下套管某煤盆的地层特点是：第四纪覆盖深，岩层软（由砂岩、细砂岩、凝灰岩、泥质粉砂岩、炭质泥岩组成）具有胶结性差、遇水膨胀、裂隙发育等特点。在施工中出现孔壁水化，坍塌掉块，十孔九漏。在这样的地层中钻进，83年我们下套管护孔。结果是：套管下不住，护堵无效果，天天处理套管脱落、套管折
My company from exploration of metal ore into coalfield census exploration work. In the face of coalfield drilling three key technology (coring, retaining plugging, sealing) to carry out a series of experiments to summarize the work. Let us know the most is the bare hole drilling process, now a few of our experience are summarized below. First, must no less or less casing A coalbed strata are characterized by: Quaternary deep cover, soft rock (sandstone, fine sandstone, tuff, muddy siltstone, carbonaceous mudstone) with poor cementing, with water Swelling, crack development and other characteristics. In the construction of pore wall hydration, collapsed blocks, ten holes nine leaks. Drilling in such a formation, 83 years we casing casing. The result is: under the casing can not live, protective effect of no plug, every day to deal with casing off, casing fold