改进的CO_2-原油最小混相压力计算模型  

An Improved Predicting Model for Minimum Miscibility Pressure(MMP) of CO_2 and Crude Oil

作　　者：陈百炼 黄海东[1] 章杨[1] 王蕾 任韶然[1] 黄安源[2] 孙平平 

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]中石化胜利油田分公司孤岛采油厂,山东东营257061 [3]渤海钻探第三钻井公司,天津300280

出　　处：《石油天然气学报》2013年第2期126-130,1,共5页Journal of Oil and Gas Technology

基　　金：国家自然科学基金项目(51174225);中央高校基本科研业务费专项(12CX06030A)

摘　　要：利用试验测定的多个油田CO2-原油最小混相压力(MMP)数据,建立了改进的MMP预测模型,并将该模型与其他模型进行了对比。结果表明,改进模型相比于其他模型具有更高的计算精度和稳定性,尤其在20～30MPa的混相压力范围内比其他模型计算精度更高,平均误差仅为2.32%。对国内外35个典型的陆相和海相原油组分组成及相应MMP的统计分析发现,由于陆相原油组分中C2～C6的平均含量要明显低于海相的,重组分C1+6的含量又明显高于海相的,导致CO2与陆相原油的MMP明显高于海相原油的。利用该模型对吉林油田和胜利油田不同区块油样的CO2驱最小混相压力进行了计算,其计算值与试验值的误差均在平均误差之内,验证了改进的模型对我国陆相油田原油的适用性。An improved MMP predicting model was built by using the data of MMP of CO2 and crude oil detected in different oilfields.The improved model was then compared with several other models,the result indicated that the improved model was more accurate and stable than others.The new model was particularly accurate within 20-30MPa with mean error of 2.32%.By statistical analysis of composition and relative MMP of 35 typical domestic and foreign crude oil samples,it was found that the average content of C2-C6 in continental crude oil was lower than that in marine crude oil and the average content of C+16 in continental crude oil was higher than that in marine crude oil,which caused the higher MMP of continental oil than that of marine crude oil.The new model is applied for predicting MMP on crude oil samples from Jilin and Shengli Oilfield,the errors of tested value and calculated one are within average error,it proves that it is feasible for oil from continental oilfields in China.

关 键 词：二氧化碳驱油 最小混相压力 预测模型 陆相原油 

分 类 号：TE311[石油与天然气工程—油气田开发工程]