欠平衡钻井泡沫水泥浆静液柱压力分析

泡沫水泥固井是欠平衡钻井配套应用的主要技术之一。要想保证全过程的欠平衡状态，在固井时推荐使用泡沫水泥，而且，泡沫水泥浆在气体钻井、易漏地层钻井中得到了广泛的运用。泡沫水泥的静液柱压力是使用该水泥的关键参数，文章讨论了泡沫质量以及温度、压力对泡沫水泥浆密度的影响，推导出了泡沫水泥浆静液柱压力计算公式，利用该式可以方便地估算泡沫水泥固井时的静液柱压力，最后对计算结果进行了简要的分析。

HYDROSTATIC FLUID COLUMN PRESSURE ANALYSIS FOR FOAM SLURRY IN UNDERBALANCED DRILLING

The foam slurry cementing is one of the main technology during underbalanced drilling. The foam slurry has been used widely in the air drilling and easy lost - formation drilling operations. The hydrostatic fluid column pressure of the foam slurry is the key parameter while using foam slurry. The paper analyses the influences of foam quality, temperature and pressure on the density of foam slurry, and gives the calculation formula of the hydrostatic pressure. It is easy to estimate the hydrostatic fluid column pressure of foam slurry while cementing. Finally, the calculation results have been analyzed briefly in the essay.