1) 5.3 This is the undergauged (tight hole) interval.
这是缩径井段。
2) This is one section of arc.
这是一段弧。
3) ducing (undergauge) well
缩径井
4) mine shaft convergence
井筒缩径
5) loss of working diameter
井径缩小
6) hole shrinkage
井眼缩径
1.
Serious hole shrinkage often occurs during drilling, which leads to the instability of borehole, the drill gets stuck and the annular tubes be pressed to break, which brings huge economic loss to the drilling.
在钻井过程中,钻开盐膏层后,原地层中地应力的相对平衡状态被打破,在井璧岩石上产生了较强的应力集中,在横向挤压力的作用下,盐膏层发生蠕动和变形,向井中滑移和流动,导致井眼缩径和失稳。
补充资料：井径
1.田间小路。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条