【摘要】 对于变形介质油藏油井产能预测问题,传统的研究方法均假设地层岩石的变形系数为常数,这导致了目前的变形介质油藏产能预测模型不能准确地反映出油井产能的变化趋势,尤其在生产压差较大的情况下,误差较大。文中研究了变形系数与产能的关系,考虑了生产压差对变形系数的影响,从而改进了变形介质油藏油井产能预测模型。改进后的模型从理论上解释了变形介质油藏矿场系统试井中,油井流入动态曲线在井底压力高于饱和压力时即向压力轴偏转,并出现最大产量点的现象,并对最大产量点出现的原因进行了分析。文中还提出了变形介质油藏油井井底最低合理流动压力,为油井确定合理的工作制度提供技术支持,从而更有效地分析及预测油井产能的变化。更多还原

【Abstract】 Traditional productivity prediction of oil wells in stress-sensitive reservoirs is studied by assuming that the deformation coefficient of the formation is constant, which may result in significant errors in the prediction of the oil well productivity especially when the producing pressure drop is high. The effect of the deformation coefficient on the oil well productivity and the relationships between producing pressure drop and deformation coefficient are studied in this paper on the basis of the in-situ data. A new mathematical model for oil well productivity prediction is then developed to offer a better description of the IPR curve with a maximum flow rate point, and a minimal bottom hole pressure is brought up to determine the reasonable working system for the oil wells in stress-sensitive reservoirs. Comparisons between the prediction results and test data indicate that the new prediction model can greatly enhance the precision of well productivity prediction.更多还原