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在钻探工作中,一谈到复杂地层,便很自然地和坍塌,漏失,膨胀,缩径,涌水,溶洞,流砂以及松散破碎等不稳定地层联系起来.其实,随着钻进方法、钻进工艺、技术水平以及钻孔结构的变化,复杂地层的复杂程度也是变化的.生产实践表明,一些原来大口径钻进时认为比较复杂的地层,一旦采用小口径金刚石钻进并配合相应的措施则显得并不复杂或不甚复杂,施工起来比较顺利就通过了.反之,某些小口径金刚石钻
In drilling, when it comes to complex formations, it is naturally linked to unstable formations such as collapsing, loss, expansion, shrinking, gushing water, karst creek, quicksand and loose crushing, etc. In fact, as drilling progresses, The level of technology, the change of the drilling structure and the complexity of complex strata.The production practice shows that some formations considered as complicated by large diameter drilling, once drilling with small caliber diamond and corresponding measures It seems not complicated or not complicated, the construction passed smoothly.On the contrary, some small-diameter diamond drill