凝析气试井分析软件用于模拟相态特征和油气藏流体性质，确定油气藏特征和流体组分变化时，形成完整的拟压力及压力折算数据。基于凝析气体在地层中存在气相和液相两种相态的考虑，该软件使用质量流量代替油气试井中的体积流量，如果没有输入油气两相相渗曲线，软件自动采用Corey公式的相渗曲线处理凝析气藏。
软件定义拟压力来描述凝析气。而凝析气体是一个非常复杂的体系，与普通气体相比，凝析气体有露点、临界点及泡点（而普通气体只有临界点，油气两相只有泡点），温度、压力高出露点后才是纯气体，露点及临界点构成的半封闭面积内为气液两相，在泡点附近又会出现气与液的溶解问题。但无论多么复杂，质量都守恒，即质量流量不变。
对于凝析气井，同气井一样需要确定“已知气体组份”或“未知气体组份”，在“未知气体组份”中采用专门的凝析气公式计算临界温度及临界压力。同时凝析气的压力折算非常复杂，为此我们提供了专门的凝析气压力折算软件。
Products>>Products on Sale>>Chengong Well Testing Software Series>>Analysis of Condensate Gas Well Testing
The condensate gas well testing analysis software is used to simulate the phase state characteristics and fluid properties of oil and gas reservoirs, and to form complete pseudo-pressure and pressure conversion data when determining the characteristics of oil and gas reservoirs and the change of fluid components. Considering the existence of gas phase and liquid phase of condensate gas in formation, the software uses mass flow instead of volume flow in oil and gas well testing. If no oil and gas two phase permeability curve is inputted, the software automatically uses the phase permeability curve of Corey formula to deal with condensate gas reservoir.
The software defines pseudo-pressure to describe condensate
gas. Condensate gas is a very complex system, compared to ordinary gas, condensate gas
has dew point, critical point and bubble point (while ordinary gas only has critical
point and oil /gas two phase only has bubble point), pure gas only exists when
temperature, pressure are higher than dew point condition, inside the semi-closed area
constructed by dew point and critical point, the gas-liquid two phases exist, and the
problem of gas and liquid dissolution will occur near the bubble point. But no matter
how complex, the mass is conserved, that is, the mass flow remains the same.
For condensate gas wells, as in gas wells, it is necessary to
determine "known gas components" or "unknown gas components". In the "unknown gas
components", a special condensate gas formula is used to calculate the critical
temperature and critical pressure. At the same time, the pressure conversion of
condensate gas is very complex, so we provide a special condensate gas pressure
conversion software.
To condensation gas, In addition to the different definition of pseudo pressure to gas well, the condensation time, degree of condensation and influence factor are took into consider, while the seepage equation, well type and boundary condition and so on are the same as that of ordinary well testing.
Figure1: Pressure conversion software interface
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Figure2: Pressure and derivative simulation chart of
condensate gas wells
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