首页|古龙页岩油注CO2/烃类气相态特征及多周期作用机制

古龙页岩油注CO2/烃类气相态特征及多周期作用机制

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  • 国家科技期刊平台
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基于PVT实验和多周期注CO2/烃类气采油物理模拟实验,结合相态模拟计算揭示古龙页岩油注气前后的高压物性和流体类型演化规律,评价多周期注气作用下的原油采出效果,分析多组分间的抽提传质机理.实验结果表明:古龙页岩油属于轻质弱挥发性油藏,当压力降低至泡点压力以下时,原油的黏度和密度快速增大,原油物性急剧变差.因此,对于成熟度较高的页岩油,利用注气补充地层能量并维持良好的原油物性是提高采收率的关键,且注CO2 对原油的膨胀、降黏效果均优于注烃类气.此外,注CO2/烃类气可使古龙页岩油由弱挥发性油藏向挥发性油藏转变,先注烃类气再注CO2 使得古龙页岩油呈现出由挥发性油藏进一步向凝析气藏过渡的趋势.古龙页岩油脱气后的溶解气驱效果更优,产出油相呈现连续的泡沫油状态.注CO2/烃类气可为地层原油补充溶解气和弹性能量,注CO2 对原油中间烃组分(C5—C10)和重烃组分(C11+)的抽提效果均较好,注烃类气对原油中间烃组分的抽提效果更好.
Phase Characteristics and Muti-Round Interaction Mechanism of CO2/Hydrocarbon Gas Injection in Gulong Shale Oil
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.

Gulong shale oilphase characteristicsCO2/hydrocarbon gas injectionmulti-round gas injection for oil extractiondissolved gas drivemass transfer

宋兆杰、邓森、韩啸、张翊航、张利超、李斌会、陈旻宸、李培宇

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中国石油大学(北京)非常规油气科学技术研究院,北京 102249

多资源协同陆相页岩油绿色开采全国重点实验室,黑龙江 大庆 163712

中国石油大庆油田有限责任公司 勘探开发研究院,黑龙江 大庆 163712

黑龙江省油层物理与渗流力学重点实验室,黑龙江 大庆 163712

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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

国家自然科学基金项目黑龙江省"揭榜挂帅"科技攻关项目中国石油大学(北京)科研基金资助项目

52074319DQYT-2022-JS-7612462021QNXZ008

2024

10.19406/j.issn.2097-4531.2024.04.001

重庆科技学院学报(自然科学版)
重庆科技学院

重庆科技学院学报(自然科学版)

影响因子：0.329
ISSN：1673-1980
年,卷(期)：2024.26(4)
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