深层缝洞型油藏烃气混相驱可行性及影响因素  

Feasibility and Influencing Factors of Miscible Hydrocarbon Gas Flooding for Deep Fractured⁃Vuggy Reservoirs

作　　者：李吉康 孙致学[1] 谭涛[2] 郭臣[2] 谢爽[2] 郝聪 LI Jikang;SUN Zhixue;TAN Tao;GUO Chen;XIE Shuang;HAO Cong(School of Petroleum Engineering,China University of Petroleum,Qingdao,Shandong 266580,China;Research Institute of Exploration and Development,Northwest Oilfield Company,Sinopec,Urumqi,Xinjiang 830011,China)

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]中国石化西北油田分公司勘探开发研究院,乌鲁木齐830011

出　　处：《新疆石油地质》2021年第6期714-719,共6页Xinjiang Petroleum Geology

基　　金：国家自然科学基金(51774317)。

摘　　要：针对塔河油田深层缝洞型油藏,基于室内相态实验,采用经验公式法、拟三元相图法和细管模拟法计算烃气与原油最小混相压力,并通过数值模拟,研究了油藏前期注入氮气和原油品质对烃气混相驱的影响。研究结果表明:3种方法计算得到的原油最小混相压力远小于地层实际平均压力,研究区深层缝洞型油藏烃气混相驱具有较好的可行性;油藏前期注入氮气对烃气混相驱影响显著,注入氮气波及的储集层区域,烃气与原油的最小混相压力变高,氮气含量与注入烃气含量比大于1.208时,无法形成混相;原油品质对烃气混相驱影响显著,原油中的轻组分含量越高,烃气与原油最小混相压力越低,原油中的重组分含量越高,烃气混相驱最终采收率越低。In order to investigate the deep fractured⁃vuggy reservoir in Tahe oilfield,the minimum miscible pressure of hydrocarbon gas⁃crude oil system is calculated through indoor phase behavior experiments and using empirical formula method,pseudo⁃ternary phase dia⁃gram method and slim tube simulation method,and the influences of early nitrogen injection and crude oil quality on hydrocarbon gas mis⁃cible flooding are studied through numerical simulation.The research results show that the minimum miscible pressure calculated by the three methods is much lower than the average actual reservoir pressure,so hydrocarbon gas⁃crude oil miscible flooding is very feasible for the deep fractured⁃vuggy reservoir in the study area;and early nitrogen injection impacts the miscible flooding significantly.In the reservoir swept by injected nitrogen,the minimum hydrocarbon gas⁃crude oil miscible pressure becomes higher.In the reservoir where the ratio of ni⁃trogen to hydrocarbon gas is greater than 1.208,a miscible phase wouldn’t appear.Crude oil quality also has a great impact on hydrocarbon gas⁃crude oil miscible flooding.The more the light components in crude oil,the lower the minimum miscible pressure of hydrocarbon gas and crude oil,and the more the heavy components in crude oil,the lower the ultimate recovery rate of the miscible flooding.

关 键 词：塔里木盆地 塔河油田 深层缝洞型油藏 烃气混相驱 最小混相压力 细管实验 可行性 

分 类 号：TE344[石油与天然气工程—油气田开发工程]