井内及井壁瞬态温度的确定

根据能量守恒原理,利用半瞬态传热近似解法,考虑流动压降生热分别导出了钻井液循环期间,钻柱内和环空钻井液温度分布的解析解,以及钻井液停止循环期间井内钻井液温度分布的解析解,然后应用数值差分法求得了近井壁地层的温度分布。利用此方法,可以求得任意时刻井内温度、井壁温度随井深的分布,任意时刻、任意井深处井壁温度的径向分布,任意点温度随时间的变化。

Determining Instantaneous State Temperature In the Borehole and the Wall

The analytic solution of drilling fluid temperature distribution inside the drill string and in the annulus has been calculated based on conservation of energy using semi-instantaneous state heat transfer approximate method during the drilling fluid's circulation and quiet. The temperature distribution near the wall of the borehole is obtained through the use of numerical difference method. By way of the above methods, the well temperature and the wall temperature distribution can be obtained at any time as the well depth changes; the wall temperature radial distribution at any time and well depth and the temperature at any point with time change can also be obtained.