CO2 气藏气井产量递减预测方法的应用

在Fraim 提出的CO₂气藏气井产量递减模型的基础上，结合非线性回归分析方法和CO₂气藏的高压物性随温度、压力变化关系，根据CO₂气藏气井的生产史确定出CO₂气藏单井控制储量和地层参数的计算公式，并应用这些公式计算了花沟气田高53 块井的单井控制储量，从而弄清了花沟气田的储量动用程度，为气田下一步开发决策提供了重要依据。同时还提出了用标准化时间和标准化压力的半对数图是否呈直线作为检验计算结果正确与否的标准，为获取准确的储量和地层参数提供了依据。

Application of Gas Well Production Decline Prediction Methods to CO2 Gas Reservoir

This paper presents some formulas which are based on Fraim's chart matching model for gas reservoir, combined with the nonlinear regression analysis and the relationship of PVT in CO₂ gas reservoir. They can be used to determine the OGIP and reservoir parameters according to CO₂ gas well production history. Through calculation of OGIP of Gao-53 Well in Huagou gas field, the reserves producing degree in this field has been found out, which can be as an important basis for further exploitation decision. Also, this paper presents the criterion to validate the calculation results with the semi-log figure of normalized time vs. normalized pressure being straight line or not, and provide references for acquiring proper OGIP or reserves and reservoir parameters.