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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.
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。
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