固井水泥浆水化凝结过程中的温度变化

引用水泥水化热数据建立了水泥浆水化热模型，将具有一定厚度的井眼环状地层 发成轴对称三角环单元，应用热传导问题的有限元法和时域问题的有限差分法，编制了相应软件，实现了水泥浆水化凝结过程中的温度计算和预测。通过对计算结果分析得出，固井水泥浆凝结工是温度变化可划分为三个阶段；影响温度变化的主要因素是地层岩石的热学性质，地层温度，初始温度与单位体积水泥浆量。利用这一方法可以进行注水泥结束之后水泥浆固化过程

THEORETICAL STUDY ON TEMPERATURE DEVELOPMENT DURING HYDRATION AND SOLIDIFICATION OF CEMENT SLURRY

By quoting cement slurry's hydration heat data to establish a mathematical model, dividing wellbore's annular formation with certain thickness into axial symmetric trigonal ring elements and applying the finite element theory and time differential method to the heat conduction problem, a software has been programmed to calculate and predict the temperature during hydration and solidification of cement slurry. Some conclusions have been obtained by analyzing the results of calculation. The changing of temperature can be divided into three phases during the setting of the slurry. And the primary factors of affecting temperature are the thermal characteristics of formation rock, formation temperature, initial temperature of the slurry and the amount of cement slurry per unit volume. This method can be applied to estimate the temperature during solidification of cement slurry and observe the effect of temperature changing on the property of casing during and after the slurry setting.