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控压钻井钻遇储层产生气侵时,会使井筒内气液两相流在不同井深、温度条件下呈现出不同的流态,从而影响环空的压力分布。为此,基于井筒传热方程和能量方程,建立起了控压钻井井筒多相流温度场计算模型,并利用循环迭代法和数值分析法求解钻柱内和环空流体温度剖面。用实例分析其随循环时间、钻井液密度及钻井液排量增加而减小的规律;计算结果与PWD实测数据误差小于2.87%,能够满足控压钻井数据计算及现场施工需要。
When pressure-controlled drilling encounters reservoir gas invasion, the gas-liquid two-phase flow in the wellbore will show different flow regimes at different well depths and temperatures, which will affect the pressure distribution in the annulus. Therefore, based on wellbore heat transfer equation and energy equation, a multi-phase flow field model for pressure-controlled drilling wellbore is established and the iterative method and numerical analysis method are used to solve the temperature profile of the inner and the annular fluid in the borehole. The law of decreasing with the increase of circulation time, drilling fluid density and drilling fluid displacement was analyzed with examples. The error between calculated results and PWD measured data was less than 2.87%, which could meet the requirements of pressure control drilling data calculation and site construction.