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为了多、快、好、省的完成钻探任务,正确地选择钻孔结构,推广小孔径钻进的经验,具有重大意义.目前在这方面存在的问题是:思想保守,不是积极地采取措施予防事故、保证岩矿心采取率,而是怕孔径小,出了事故难处理,岩矿心采取率低,故往往设计孔径偏大;墨守陈规,不从实际情况出发,而是硬搬书本数据;还有的钻孔设计,孔深误差大,往往临终孔还要继续加深钻进,或未达原设计孔深就要提前结钻.为此,都尽量采用大孔径;有的则是地质与探矿部门配合不善,对现场缺乏具体指导,对换径工作重视不够,再加之现场怕麻烦,该换小孔径的不换,该下套管的不下(有时不该下的却下了)造成了钻孔结构不当.综上所述,由于钻孔孔径偏大,结构不当,不仅大大地影响了钻探效率的提高,而且造成了钻探工作中很大的浪费.
In order to more, faster, better, provincial completion of the drilling mission, the correct choice of drilling structure, the promotion of small-aperture drilling experience, of great significance.Current problems in this area are: conservative thinking, not actively take measures to prevent Accident, to ensure the rock mining rate, but rather small aperture, out of the accident difficult to deal with, rock mining take rate is low, it is often the design of large aperture; stick to stereotypes, not from the actual situation, but hard to move the book data ; There are drilling design, hole depth error, often have to continue to deepen drilling hole, or less than the original design hole drilled ahead of schedule have to try to use large aperture; while others are geological Poor cooperation with the exploration department, the lack of specific guidance on the scene, attention to the work of changing the value is not enough, coupled with the scene of trouble, the change for a small aperture does not change, the casing under (and sometimes not under the next) caused Improper drilling structure.In summary, due to large borehole diameter, improper structure, not only greatly affected the improvement of drilling efficiency, but also caused a great waste of drilling work.