欠平衡的

Air and gas drilling is one of the most promising under-balanced drilling technology, which is developing at a surprising speed.

气体钻井技术是目前正在迅速发展的欠平衡钻井技术中的一种。

This particular situation will drop your scores, because the balanced owed is more than 30% of credit limit.

这种特殊的情况会下降，你的分数，因为欠平衡，是30 ％以上的信贷限额。

Therefore based on analysis of the status quo and the bottleneck points of the drilling and completion, effective measures have been put forward, including optimization of casing program, application of UBD and compound drilling, adoption of nonpermeable drilling fluid, diverting technology, rotating while cementing, casing optimization, horizontal drilling and extended reach well technology, etc.

为解决上述问题，在对钻井完井现状和难点进行分析的基础上，提出了有效的应对措施，主要包括优化井身结构，推广应用欠平衡钻井和复合钻井技术，采用非渗透钻井液、屏蔽暂堵技术和旋转固井技术，优选套管射孔完井，开展水平井和大位移井钻井工艺等。

The more effective technology and insurance are offered for future underbalance drilling.

为以后的欠平衡钻井提供了更加有效的技术和安全保障。

It is shown that this kind of mud can meet the demand of underbalance drilling for horizontal length in Guang'an structure.

室内研究与现场应用表明，超低密度硬胶极压型油包水乳化钻井液能够很好地满足广安构造水平井段欠平衡钻井的需要。

While underbalance drilling spreads greatly, rotating blowout preventer, as a kind of high technical product, is the crucial equipment to control well pressure.

国内欠平衡钻井普遍实施，要用到的旋转防喷器是关键设备，技术含量高。

During underbalance drilling gas reservoir is opened gradually,gas is in the shape of spherical from formation into annular flow and bubbles will be inflation migration,so radius of bubbles formation is important for the annular fluid.

欠平衡钻井过程中气层逐渐被打开时，气体将以小气泡的形式从地层进入环空流体中，气泡进入环空后将膨胀运移，变成大气泡，因此气泡生成半径对环空流体的流动规律有重要影响。

When the sandstone gas reservoir is drilled open by the underbalanced drilling using water based mud, the underbalance pressure normally can hardly offset the imbibition capillary force of the rock, which may result in backwash imbibition.

这种自吸效应可能对砂岩气藏水基欠平衡钻井的储层保护效果产生影响，但目前与之有关的实验研究还很缺乏。

Entire process Downhole-Deployment-Valve underbalanced drilling is an advanced unkilling technology that was developed in recent years.

套管阀全过程欠平衡钻井是近几年发展起来的一项先进的不压井起下钻技术。

Diesel engine tail gas drilling is a kind of gas-based underbalanced drilling, with advantages of protecting oil/gas reservoirs and improving ROP. However, due to complex composition, the diesel tail gas will give rise to severe corrosion to oil country tubular goods.

柴油机尾气负压钻井属气基欠平衡钻井，具有保护油气层和提高钻井速度等优点，但柴油机尾气成分复杂对石油管材可产生不同程度的腐蚀。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。