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在钻探施工过程中,为满足地质取心要求,必须根据岩层的变化而随之改变其钻进方法和相应的取心工具。为有效地减少提下钻变换取心工具的辅助时间,增加回次进尺时间及取心的效能,研究综合式孔底可变钻具有着重大的现实意义。在钻进工作中,一般以岩层的特点及采心的难易程度,多选用孔底喷射反循环、无泵及单动双管或双动双管等钻具进行钻进取心,但都均以一种形式出现于孔底,对多变
During drilling construction, in order to meet the geological coring requirements, it is necessary to change the drilling method and corresponding coring tools according to the rock formation. In order to effectively reduce the auxiliary time to drill tools and to increase the efficiency of footage time and coring, it is of great practical significance to study integrated drilling bottom hole drilling tools. In the drilling work, drilling and coring are generally selected based on the characteristics of the rock formation and the difficulty of collecting the heart. Multiple drilling bottom hole injection reverse circulations, non-pumping and single-action double-pipe or double-action double-pipe drilling tools are used for drilling coring. Appears in a form of hole bottom, to change