descent是什么意思

用法例句

Improvement of subsea wellhead tieback procedurefor well A5 in Pinghu oil and gas field;

平湖油气田A5井水下井口重回接工艺的改进

Mechanical stability analysis of subsea wellhead for deepwater drilling;

深水钻井水下井口力学稳定性分析

This system can be used to test the performance indexes of logging tools by simulating the temperature and pressure of down-hole environment.

介绍了一种模拟井下环境的下井仪器测试系统。

Development of High Performance Self-containing Downhole Gauge System;

高性能自容式下井计的研制

Adesign method for a downhole cartridge simulator to be used in theequipment with a memory for directly storing 2PSK signal of the pattern characteristics isproposed.

给出了直接存储模式曲线的２ＰＳＫ信号的新方法，根据该方法设计了下井仪模拟器，并采用软件调相予以实现。

According to the condition at open_working area and the engineering requirement at Ni Zu Tang Mine of Lian Ping county, it is more beneficial to the low of the underground water level at the open-working area and the dewater of the working area at the deep pit mine for the change of the traditional pump and drainage at the deep pit mine working area into drainage of the underground well_point.

连平县泥竹塘铁矿根据露天采场的条件和工程需要 ,改传统的矿坑抽排水为地下井窿排水 ,更有利于露天采场地下水位的降低和深凹采矿工作面的疏干 ,其基建费用和运行费用总额比传统抽排水费用大幅降