（3）泡沫钻井流体（Foam Drilling Fluids） 钻井中使用的泡沫是一种将气体介质（一般为空气）分散在液体中，并添加适量发 泡剂和稳定剂而形成的分散体系。
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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.
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