2) one-time up-return
一次上返
1.
The one-time up-return cementing technology is used to cement long open holes of gas wells,having advantages of shortening drilling cycle,reducing drilling cost,eliminating the problem of decreasing the bearing capability of casing string which is often caused due to the use of stage collar,and ensuring the cementing quality in gas zone sections.
一次上返固井技术是解决天然气井长裸眼段固井的一项技术,优点在于缩短了钻井周期,降低钻井成本,消除了因使用分级箍而造成套管串承压能力降低等问题,气层段固井质量也得到了有效保证。
3) upper demicontinuous
上次连续
4) upper subdifferentiability
上次可微
5) "previous civilization"
上次文明
6) Graded coring
分次上环
补充资料：上次
1.上等中的次等。 2.前次，上回。
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