摘要
掌握气驱开发整体规律,尤其是产量变化规律是准确评价气驱潜力和科学编制注气方案的前提。以气驱采收率计算公式为基础,利用采出程度,采油速度和递减率之间的内在微积分关系,推导出气驱采油速度、产量递减率和气驱含水率、气油比等主要生产指标遵循的变化规律。首次给出气驱增产倍数的严格定义和乙型气驱规律曲线。研究成果为解释油藏气驱生产动态提供了理论依据,对油藏注气决策有重要指导意义。
Gas flooding has already been the most important EOR technology worldwide for its increased oil dis- placement efficiency and ability to fast build up formation pressure. Rules governing gas flooding responses are found for scientific decision making in terms of gas injection. Based on long term study of gas flooding practices, the computation method for recovery factor of gas flooding reservoirs has been put forward by incorporates formation geological conditions, current recovery right before gas injection, level of miscibility and engineering parameters of gas injection. And then, oil production rate, its decline rate and lowered amplitude of water cut during gas injec- tion period have been strictly derived using the intrinsic differential relationships between these physical quantities under acceptable assumptions from long core flooding experiments. A new concept, ＇ Oil Rate Multiplier for Gas Flooding＇ is defined with its comparison among 16 gas injection oil fields. Finally, a highly effective technical model for gas flooding development planning named hybrid water alternating gas combined with periodical produc- tion （HWAG-PP） is generalized. These systematic findings constitute the basic contents of reservoir engineering methodology for gas flooding and lead to reliable, prompt development planning.
出处
《科学技术与工程》
北大核心
2013年第2期460-463,共4页
Science Technology and Engineering
基金
中石油股份公司专项(07-02Z-01-03)资助
关键词
气驱油藏
开发规律
采收率
递减率
含水率
气油比
方案设计模式
gas flooding reservoirs regularity understandings recovery factor decline rate wa-ter cut gas oil ratio HWAG-PP
