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1)  Aerated UBD
充气欠平衡
2)  aerated underbalance drilling
充气欠平衡钻井
3)  air under-balanced drilling technique
空气欠平衡
1.
In order to protect the reservoir, to improve the drilling rate in Daqing Oilfield and accelerate the exploration speed in Xujiaweizi Area and to think about the real condition in this part, the air under-balanced drilling technique was used in the section from 2550 to 2918 m of Xushen21 well.
为了达到保护储层、提高钻井速度和加快徐家围子地区天然气勘探步伐的目的,大庆油田结合徐深21井的具体岩层特征,在2550~2918m井段实施了空气欠平衡钻井技术。
4)  Underbalance ['ʌndə,bæləns]
欠平衡
1.
The Research of Underbalance Drilling Technology Applying in Daqing Oil Field;
大庆油田欠平衡钻井工艺技术应用的研究
2.
Application and knowledge of underbalanced drilling technology
欠平衡钻井技术的应用与认识
3.
When the sandstone gas reservoir is drilled open by the underbalanced drilling using water based mud (WBM), the underbalance pressure normally can hardly offset the imbibition capillary force of the rock, which may result in backwash imbibition.
采用水基钻井液欠平衡钻开砂岩气层时,欠平衡压差往往并不能完全抵消岩石的自吸毛细管力,从而产生逆流自吸效应。
5)  under-balanced
欠平衡
1.
Application of comprehensive mud logging parameters in interpretation & evaluation of the under-balanced well gas layers;
综合录井参数在欠平衡井气层解释评价中的应用
6)  under balance
欠平衡
1.
There are 4 big difficult problems in perforations under balanced well: perforation under wellhead pressure,snubbing operation throughout perforating process,low confining pressure perforating operation and the fullbore string convenient for the following operations.
欠平衡钻井条件下配套的射孔技术具有四大射孔难题:井口带压作业、全过程不压井作业、低围压射孔作业及便于后续作业。
2.
Under balance drilling is paid great attention to by people for it is favourable for discovering and protecting oil and gas reservoirs,raising drilling speed,reducing cost and lessening drilling lost circulation and differential pressure sticking.
欠平衡钻井由于有利于发现和保护油气层、提高钻速、降低成本 ,减少井漏及压差卡钻等复杂情况 ,而受到人们的高度重视。
补充资料:氨合成平衡速率氨平衡合成率
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性质:又称氨合成平衡速率氨平衡合成率。在不同的催化反应条件下,氨合成反应达到一定程度的化学平衡时氨合成的反应率或合成率。在实际氨合成生产中,不可能达到平衡氨合成率,在工业上设计氨合成塔时,就必须着眼于它的运行能最大限度地接近平衡氨合成率。

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