着重论述了水平井段欠平衡钻井负压差值的选择依据，以及泡沫流体各参数的设计方法。
How to select the proper different pressure of UBD in the horizontal part of the well was discussed in this paper, as well the design of foam parameter.
对近几年来我国油田在钻井、完井和采油方面应用泡沫流体的情况作了综述。
The application of foam fluid in drilling, well completion and production in China oil fields in recent years is summarized.
石油钻井过程中，由于井内温度、压力随井深不断地变化，在不同的井深处泡沫流体的流变性会发生明显的变化，给确定泡沫流变性带来了一定的困难。
Because the temperature and pressure are various in different well depth, and the foam fluid rheology change with well depth, it is difficult to determine the foam fluid rheology during drilling.
由于其独特的优势，泡沫流体钻井已成为欠平衡钻井系列技术中的重要组成部分。
With the particular advantages foam fluid drilling has been the important proportion of underbalanced drilling.
利用泡沫流体进行欠平衡钻井，是一种较安全的钻井技术。
利用泡沫流体进行欠平衡钻井，是一种较安全的钻井技术。
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