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深井钻井具有高温高压及地层压力和地层破裂压力间安全钻井液密度窗口极为狭窄的特点，这为在深井钻井过程中保持井眼系统的压力平衡提出了更高的要求。为此，针对深井钻井的特点，运用流变学、传热学和物质平衡的基本原理，建立钻井液循环和静止状况下的钻井液温度分布模式及高温高压密度模式和高温高压流变模式，应用这些模式和地层流体的ＰＶＴ特性对一些实钻深井的溢流现象进行分析。结果表明，井眼水力系统流体热力学模型对深井、超深井的压力平衡控制至关重要。
Deep well drilling has the characteristics of extremely tight temperature window, high temperature and pressure, and tight formation of safe drilling fluid density between formation pressure and formation fracture pressure. This puts forward higher requirements for keeping wellbore pressure balance during deep well drilling. Therefore, according to the characteristics of deep well drilling, using the basic principles of rheology, heat transfer and material balance, the drilling fluid temperature distribution model and the high temperature and high pressure density mode and high temperature and high pressure rheological mode under drilling fluid circulation and stationary condition are established, The PVT characteristics of these fluids and formations are used to analyze the flooding phenomenon of some deep-well drilled wells. The results show that the wellbore hydraulic system fluid thermodynamic model is very important for the pressure balance control of deep and ultra-deep wells.