【摘要】 致密气藏的水锁现象是严重影响该类气藏气井产能的重要原因，超临界注入干化是解除水锁效应的有效方法，高温高压下干化反应相态是工艺设计的基础问题之一。本文首先通过PVT（Pressure/Volume/Temperature）测试研究了离子型碳化物干化主剂在超临界CO₂中的溶解性质、测试了在超临界CO₂中的饱和蒸气压，从理论上给出了干化主剂超临界CO₂溶解计算方法，进而测试了高温高压下干化剂超临界CO₂溶液与地层水的反应，研究了干化热效应在高温下的变化规律，并建立了含干化反应的数学模型和模拟方法。研究结果表明：超临界CO₂溶解固体物质时的逸度校正系数并不能取1进行近似，高温高压下地层水干化中的热效应不会因系统高压而消失，高温高压下含化学反应的相态模型可初步用于储层干化反应工艺设计计算。更多还原

【Abstract】 The water lock phenomenon of tight gas reservoirs is an important reason that seriously affects the productivity of gas wells in such gas reservoirs.Supercritical injection drying is an effective method to remove the water lock effect, and drying reaction phase state under high-temperature and pressure is one of the funsdamental problems in process design.In this paper, firstly, PVT test is used to study the dissolution properties of ionic carbide drying agent in supercritical CO₂,and the saturated vapor pressure in supercritical CO₂ is obtained by testing.Theoretically, the calculation method of drying agent dissolution in supercritical CO₂ is given, and then the reaction between drying agent and supercritical CO₂ solution and formation water under high temperature and pressure is tested, and the change rule of drying heat effect under high temperature is studied, the mathematical model and simulation method including drying reaction were established.The research results show that the fugacity correction coefficient when supercritical CO₂ dissolves the solid substances cannot be approximated by 1,the thermal effect in the drying reaction of formation water under high temperature and high pressure will not disappear because of the high pressure of the system.The phase state model containing chemical reactions under high temperature and pressure can be preliminarily used to design and calculate the reservoir drying reaction process.更多还原