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气井的试井分析是气藏开发动态监测和动态分析的一个重要手段。气藏和气井进入开发的中、后期后，不同程度地见水使井筒气水两相流动和地层气水两相渗流对试井分析结果的影响日益突出，包括常规试井方法和现代试井方法的现有传统试井分析技术受解析解处理方式的限制，无法较好地考虑上述复杂因素的影响，寻求新的试井分析方法已经成为气田开发对技术发展的一大要求。文章针对天然气开发过程中气水井井筒流动和地层渗流的特点，考虑井筒气水两相流动和地层气水两相渗流等对试井分析的影响，建立了气水两相地层／井筒两相组合数学模型并用数值方法进行了求解。为气水井试井开辟了新的途径。

Estblishment and Solution of Well Test Numerical Model for Gas-water Two-phase Wellbore/Formation Combination

Well test analysis is an important measure for the monitoring and analysis of gas field development performance.After having entered into medium and later development phase,the gas reservoir and gas well will be hit by water invasion to a varying degree,which makes the influence of the gas-water two-phase flow in wellbore and the gas-water two-phase seepage flow in formation on the results of well test analysis increasingly outstanding.Because the existing traditional well test analysis technique (including conventional and modern well test methods)is restricted by the processing method of analytical solution and can not consider the influence of above-mentioned complex factors,exploring a new well test analysis method becomes a major requirement of gas field develoment for technical progress.In this paper,in the light of the characteristics of the gas-water two-phase flow in wellbore and the seepage flow in formation in the process of gas field develpment and in view of the influence of the gas-water two-phase flow in wellbore and the gas-water two-phase seepage flow in formation on well test analysis,a mathematical model for gas-water two-phase formation/wellbore combination is established,which solution is acquired by numerical method,opening up a new way for gas-water well test.