地层静温预测的非牛顿流体数学模型

The non-Newtonian fluid mathematical model for strata static temperature forecast

根据热力学参数、泥浆参数及井筒结构参数等 ,先选定一个地层温度梯度进行计算 ,得出泥浆出口温度 .将此计算值与实测温度值比较 ,按照比较结果再修正所选的地层温度梯度 .如此反复 ,直到得出合理的地层温度梯度 .在此基础上 ,从热力学及流体力学等有关方程出发 ,经过推演得到井壁上温度随深度变化以及地层温度分布的数学模型 .由于钻井过程中泥浆、岩石及其温度场间是相互作用、相互影响的 ,这为研究热 流 固耦合渗流过程的理论与应用提供了一种新的方法 .

Firstly, we choose a strata temperature gradient and start to compute. According to thermodynamic parameters, mud fluid parameters and well casing structure parameters etc., the exit temperature of mud fluid can be obtained. By comparing the calculated value with the measured value of the exit temperature, we correct the chosen strata temperature gradient. Sequentially, we do above-mentioned works repeatedly until a proper strata temperature gradient is gained. Based on this, derived from the equations of thermodynamics and fluid mechanics, we can obtain the temperature variation along the depth of sidewall, and the mathematical model of distribution of strata temperature. Since mud fluid, rock and the temperature field are interactive and interfering during the process of drilling wells, the above technique provides a new method for investigating the theory and applications of the coupled thermal-hydrological-mechanical processes.