Abstract: Aiming at W block in J Oilfield, combining screening criteria, theoretical calculation and numerical simulation method, while evaluating reservoir properties, remaining reserves and development status, a feasibility evaluation method of steam ensuing steam stimulation was established. Then the steam feasibility of target block was evaluated: It turns out that the geological characteristics of this block agreed well with the screening standard of steam flooding. Furthermore, the steam flooding generates a higher recoverable reserve than steam stimulation, the effective heat communication was formed between wells, and he degree of reservoir heated during stimulation stage can meet the needs of steam flooding. The project of converting to steam flooding after steam stimulation was optimized. It was determined that conducting the intermittent steam injection performed a better flooding effect when the recovery factor of steam stimulation reached 15.20%, in which steam injection time, interval time, steam injection rate, steam quality and production⁃injection ratio were 3 months, 1 month, 133.33 t/d, 0.60 and 1.3 respectively. The recovery factor was 42.3% when the oil⁃steam ratio reached 0.12, 29.6% higher than that of steam stimulation. This study contributed an evaluation method for steam flooding ensuing stimulation, and provided a good reference to similar reservoirs.

Key words: Heavy oil reservoir, Feasibility study, Steam flooding, Thermal inter?well communication, Intermittent steam injection

摘要： 以J油田W区块为例，综合筛选标准、理论计算及数模优化方法，评价油藏属性、物质基础及开发现状，形成蒸汽吞吐转蒸汽驱可行性的评价方法，进而确定目标区转蒸汽驱适应性：研究区块储层物性参数与蒸汽驱筛选标准符合良好；远井地带剩余油饱和度高，增油储量基础好；井间形成有效热连通，吞吐阶段储层预加热程度可满足转蒸汽驱需求。基于此优化蒸汽驱关键参数，确定蒸汽吞吐转蒸汽驱最优技术策略。优选在蒸汽吞吐阶段采收率达到15.20%时转换为注汽3个月，注汽速度为133.33 t/d，停注1个月的间歇注汽，蒸汽干度为0.60，采注比为1.3的蒸汽驱开发方案。预测表明，当油汽比达到0.12时，最终采收率达42.3%，较蒸汽吞吐提升29.6%。研究为稠油油藏蒸汽吞吐转蒸汽驱可行性分析提供参考，为其他同类型油藏技术策略的制定提供借鉴意义。

关键词: 稠油油藏, 可行性分析, 蒸汽驱, 热连通, 间歇注气