小断块油藏CO2、N2单井吞吐强化采油可行性对比研究  

FEASIBILITY STUDY ON SINGLE WELL CO_2, N_2 HUFF AND PUFF IN SMALL FAULT BLOCK RESERVOIR

作　　者：张国强[1] 孙雷[2] 吴应川[3] 董维哲[4] 孙良田[2] 李士伦[2] 

机构地区：[1]中国石油勘探开发研究院,100083 [2]油气藏地质及开发工程国家重点实验室·西南石油大学 [3]中石化中原油田分公司 [4]中石化中原石油勘探局钻井三公司

出　　处：《钻采工艺》2008年第4期53-55,73,共4页Drilling & Production Technology

基　　金：油气藏地质及开发工程国家重点实验室基金项目(PLN0118:注气提高采收率候选油藏评价指标体系及综合评价方法研究)资助成果

摘　　要：针对ZY油田原油注气吞吐的工艺过程,建立了注气吞吐数值模拟模型。应用数值模拟方法对实例井分别用CO2、N2吞吐进行了分析,首先对该井的注气吞吐参数进行敏感性分析,分析了注气周期注入量、注入速度、焖井时间、采液速度等因素对注气吞吐效果的影响,并对CO2、N2吞吐参数进行了对比分析;对优化得到的方案进行注气吞吐生产指标预测对比。开始生产后注N2的日产油比注CO2恢复要快些,但持续的时间没有注CO2的长;注N2的累计采油量和累计增油量都比注CO2的大。通过对比分析表明本井采用N2吞吐所得到的增油量、换油率大于采用CO2吞吐的,因此会获得更好的效益。通过不同注入气不同时期的含油饱和度和压力分布的对比分析得到了造成这种结果的原因。Aiming at technical process of gas injection huff and puff in ZY oilfield, the numerical simulation model was established at the foundation of geologic research. Numerical simulation was done in the example well, first the parameters sensibility was analyzed of CO2、N2 huff and puff, and the influence of cycle injection volume, injection rate, stew well time, production rate etc. on gas injection huff and puff effect was evaluated, then optimal operation parameters of CO2、N2 huff and puff were obtained,and production index forecast was carried out. After going into production, daily oil production was restored soon injecting rather N2 than CO2, but duration was longer rather CO2 than N2. The quantity of the cumulative recovery and accumulative increasing oil were larger rather injecting N2 than CO2. Through comparative analysis, it is showed that this well gained greater increase oil quantity, oil change rate by injecting N2 rather than injecting CO2, so preferable benefit would be obtained.

关 键 词：小断块油藏 CO2吞吐 N2吞吐 数值模拟 对比 

分 类 号：TE347[石油与天然气工程—油气田开发工程]