重庆科技大学学报（自然科学版）2024，Vol.26Issue(4)：1-10,10.DOI:10.19406/j.issn.2097-4531.2024.04.001
古龙页岩油注CO2/烃类气相态特征及多周期作用机制
Phase Characteristics and Muti-Round Interaction Mechanism of CO2/Hydrocarbon Gas Injection in Gulong Shale Oil
摘要
Abstract
Based on PVT experiments and multi-round CO2/hydrocarbon gas injection physical simulation experi-ments,combined with phase simulation calculations,this study reveals the high-pressure physical properties and fluid type evolution laws of Gulong shale oil before and after gas injection,evaluates the crude oil recovery effect under multi-round gas injection,and analyzes the mass transfer law of multi-component extraction.The experi-mental results show that Gulong shale oil belongs to a light and weakly volatile oil reservoir.When the pressure drops below the bubble point pressure,the viscosity and density of the crude oil increase rapidly,and the physical properties of the crude oil deteriorate sharply.Therefore,for shale oil with high maturity,using gas injection to supplement formation energy and maintain good crude oil properties is the key to improving oil recovery,and CO2 injection has better effects on crude oil expansion and viscosity reduction than hydrocarbon gas injection does.In addition,injecting CO2/hydrocarbon gas can transform Gulong shale oil from a weakly volatile reservoir to a volatile reservoir.Injecting hydrocarbon gas first and then injecting CO2 can further transition Gulong shale oil from a vola-tile reservoir to a condensate gas reservoir.The dissolved gas drive effect of Gulong shale oil after degassing is bet-ter,and the produced oil phase presents a continuous foam oil state.Injecting CO2/hydrocarbon gas can supplement the dissolution gas and elastic energy of formation crude oil.Injecting CO2 has a better extraction effect on the inter-mediate hydrocarbon components(C5-C10)and heavy hydrocarbon components(C11+)of crude oil,while injecting hydrocarbon gas has a better extraction effect on the intermediate hydrocarbon components of crude oil.关键词
古龙页岩油/相态特征/注CO2/烃类气/多周期注气采油/溶解气驱/组分传质Key words
Gulong shale oil/phase characteristics/CO2/hydrocarbon gas injection/multi-round gas injection for oil extraction/dissolved gas drive/mass transfer分类
能源科技引用本文复制引用
宋兆杰,邓森,韩啸,张翊航,张利超,李斌会,陈旻宸,李培宇..古龙页岩油注CO2/烃类气相态特征及多周期作用机制[J].重庆科技大学学报（自然科学版）,2024,26(4):1-10,10.基金项目
国家自然科学基金项目"页岩油储层纳微米孔喉中油-CO2-水多元体系相行为与流动机制研究"(52074319) （52074319）
黑龙江省"揭榜挂帅"科技攻关项目"古龙页岩油提高采收率关键问题研究"(DQYT-2022-JS-761) （DQYT-2022-JS-761）
中国石油大学(北京)科研基金资助项目"页岩油提高采收率机理与参数优化研究"(2462021QNXZ008) （北京）
