致密油藏CO_(2)吞吐参数优化数值模拟研究  

Numerical Simulation Study on Parameters Optimization of CO_(2)Huff-n-puffin Tight Reservoir

作　　者：宋保建 李景全[1] 孙宜丽 张薇[1] 刘鹏[2] Song Baojian;Li Jingquan;Sun Yili;Zhang Wei;Liu Peng(Sinopec Henan Oilfield Branch,Nanyang,Henan 474780,China;China University of Petroleum(East China),Qingdao,Shandong 266580,China)

机构地区：[1]中国石化河南油田分公司,河南南阳474780 [2]中国石油大学(华东),山东青岛266580

出　　处：《特种油气藏》2023年第4期113-121,共9页Special Oil & Gas Reservoirs

基　　金：中国石化科技重大专项“渭北超低渗低压油藏改善开发效果对策研究”(P18078)。

摘　　要：为提高致密油藏压裂后油井开发效果,基于河南油田ZD区块,通过压裂裂缝变导流物理实验确定基质及裂缝的渗透率-应力敏感性关系,应用数值模拟方法,确定致密油藏不同储层CO_(2)吞吐参数最优值。结果表明:在注入和闷井阶段,CO_(2)波及范围越来越大,波及范围内原油黏度明显降低,生产阶段CO_(2)随原油产出,动用范围较大;换油率随CO_(2)注入量或闷井时间的增加均呈现先上升后降低趋势,与CO_(2)注入速率呈正相关性,与吞吐周期呈负相关性;储层物性越好,最佳CO_(2)注入量及注入速度越低,最佳闷井时间越短,吞吐周期越多。在四类储层的ZA4121井开展CO_(2)吞吐试验,累计增油量为303.4 t,取得较好开发效果,换油率为0.16 t/t。研究成果可为致密油藏压裂后CO_(2)吞吐相关研究与应用提供参考。To improve the development effect of oil wells after fracturing in tight reservoirs,based on the Block ZD of Henan Oilfield,the permeability-stress sensitivity relationship of matrix and fracture was determined by fracture-variable-conductivity physical experiments,and the numerical simulation was applied,to determine the optimal values of CO_(2)huff-n-puff parameters in different reservoirs of tight oil reservoirs.The result shows that in the injection and shut-in stages,the affected area of CO_(2)is getting wider and wider,the crude oil viscosity in the affected area decreases significantly,and the CO_(2)is produced with the crude oil in the production stage,and the range of production is larger;the oil exchange rate increases and then decreases with the increase of CO_(2)injection volume or shut-in time,which is positively correlated with the CO_(2)injection rate and negatively correlated with the huff-n-puff period;the better the reservoir physical properties,the lower the optimal CO_(2)injection volume and injection rate,and the shorter the optimal shut-in time and the longer huff-n-puff cycles.The CO_(2)huff-n-puff test was carried out in Well ZA4121 in four types of reservoirs,and the accumulated oil increment was 303.4 t,which achieved a good development effect with an oil exchange rate of 0.16 t/t.The research results can provide reference for the study and application related to CO_(2)huff-n-puff after fracturing in tight reservoirs.

关 键 词：致密油藏 压裂 CO_(2)吞吐 数值模拟 参数优化 

分 类 号：TE357[石油与天然气工程—油气田开发工程]