cleaning hole cover latch.
清洁孔盖闩
and a fourth step taking out the mastic, and cleaning the screwed hole.
第四步, 将膏胶取出, 清理干净螺纹孔。
Hole cleaning is one of the key techniques in extended reach well drilling.
井眼净化，是大位移钻井的关键技术之一。
Hole Cleaning Detecting Method for Extended Reach Wells by Monitoring Annulus Pressure Change
大位移井井眼清洁监测技术
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