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我队近年来在含砂粒较多的地层中钻进,经常发生岩心管上部接手被磨坏而折断钻具的事故。经分析,这主要是由于含砂粒的岩屑,随上返的冲洗液向上移动,通过粗径后,钻杆的外环间隙突然变大,液流上返速度相应变慢,致使岩屑在接手部位上下串动,形成“涡流”,并反复地磨损岩心管接手而造成的。特别是接手的丝扣部位,更容易被磨坏、折断。
In recent years, our team has drilled in more sand-bearing formations, and it is often the case that the upper part of the core pipe is worn and the drill is broken. After analysis, this is mainly due to the debris containing debris, with the return of the rinse upward mobility, through the large diameter, the outer ring of the drill pipe suddenly become larger, the corresponding rate of liquid back to slow, resulting in debris in the Take over the parts move up and down, forming a “vortex”, and repeatedly wear and tear caused by the core tube to take over. Especially take over the threaded parts, more easily worn, broken.