高凝油藏注CO2吞吐影响因素数值模拟  

NUMERICAL SIMULATION OF INFLUENCING FACTORS OF CO2 HUFF-AND-PUFF IN HIGH POUR POINT RESERVOIRS

作　　者：张新征[1,2] 冯明生[1] 李香玲[1] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油大学石油工程学院,北京102249

出　　处：《大庆石油地质与开发》2009年第1期118-122,共5页Petroleum Geology & Oilfield Development in Daqing

基　　金：中国石油天然气股份公司重点攻关项目：苏丹3/7区Palogue油田高效开发配套技术研究（04b60201）.

摘　　要：为深入了解CO2吞吐过程中各种注采工艺参数对高凝油藏开发效果的影响，针对某高凝油藏的地质及油藏特征，在PVT实验和相态拟合数据的基础上，建立了数值模拟模型。在此基础上进行了数值模拟计算，分析了5个敏感因素对开发效果的影响。研究结果表明，对于高凝油藏，CO2吞吐的注入速度、注入时间、焖井时间、井底流压等参数都存在最佳范围，最佳注气速度为60000m^3／d，最佳注入时间为40d，最佳焖井时间为16d，生产时合理的井底流压为600psi，计算比较了5个吞吐轮次的吞吐生产效果，从换油率指标来看前3个吞吐轮次的效果最好。To understand effect of different injection and production techniques parameters of CO2 huff-and-puff on development effect of high pour point reservoirs, a numerical simulation model is developed on the basis of data from PVT experiments and phase behavior matching targeting geology and reservoir characteristics of a high pour point reservoir. Numerical simulation calculation is conducted on this basis, and effect on five sensitive factors on development effect is analyzed. Study results indicate that, for high pour point reservoirs, there is an optimum range for parameters, including injection rate of CO2, injection period, shut-in period, and bottom hole flowing pressure. Optimum injection rate is 60000m^3/d, optimum injection period is 40d, optimum shut-in period is 16d, and reasonable bottom hole flowing pressure during production is 600psi. Production effect of five rounds of huff- and-puff is compared through calculation. Index of oil replacement ratio shows that the first three rounds huff-and- puff have the optimum production effect.

关 键 词：高凝油藏 CO2 吞吐 数值模拟 影响因素 

分 类 号：TE357.7[石油与天然气工程—油气田开发工程]