控压钻井多相流温度场预测

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。

Forecast of temperature field of multi-phase flow in managed pressure drilling

When gas invasion occurs in the pay zones targeted in managed pressure drilling(MPD),the two-phrase gas liquid flow in the borehole will be in different states under different well depth and different temperatures.This will inevitably influence the pressure profile in wellbore annulus.In view of this,based on the wellbore heat transfer and energy equations,the calculation models are set up for the temperature field of multi-phase flows in MPD.Then,the temperature profiles of flows in the drilling string and the annulus are obtained by use of the iterative and numerical methods.A number of case histories show that the said temperature profiles will decrease with the increasing of circulating time,drilling fluid density,and drilling fluid displacement,and the error between the calculated results and the measured data of pressure-while-drilling is less than 2.8%,which can meet the need for the MPD data calculation and actual operation.