古龙页岩油注CO_(2)/烃类气相态特征及多周期作用机制  

Phase Characteristics and Muti-Round Interaction Mechanism of CO_(2)/Hydrocarbon Gas Injection in Gulong Shale Oil

作　　者：宋兆杰[1] 邓森 韩啸[1] 张翊航 张利超 李斌会 陈旻宸 李培宇[1] SONG Zhaojie;DENG Sen;HAN Xiao;ZHANG Yihang;ZHANG Lichao;LI Binhui;CHEN Minchen;LI Peiyu(Unconventional Petroleum Research Institute,China University of Petroleum-Beijing,Beijing 102249,China;State Key Laboratory of Continental Shale Oil,Daqing Heilongjiang 163712,China;Exploration and Development Research Institute,Daqing Oilfield Limited Company,Daqing Heilongjiang 163712,China;Heilongjiang Key Laboratory of Reservoir Physics and Fluid Mechanics in Porous Medium,Daqing Heilongjiang 163712,China)

机构地区：[1]中国石油大学(北京)非常规油气科学技术研究院,北京102249 [2]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 [3]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 [4]黑龙江省油层物理与渗流力学重点实验室,黑龙江大庆163712

出　　处：《重庆科技大学学报（自然科学版）》2024年第4期1-10,共10页Journal of Chongqing University of Science and Technology(Natural Sciences Edition)

基　　金：国家自然科学基金项目“页岩油储层纳微米孔喉中油-CO_(2)-水多元体系相行为与流动机制研究”(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);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)。

摘　　要：基于PVT实验和多周期注CO_(2)/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CO_(2)对原油的膨胀、降黏效果均优于注烃类气。此外,注CO_(2)/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CO_(2)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CO_(2)/烃类气可为地层原油补充溶解气和弹性能量,注CO_(2)对原油中间烃组分(C_(5)—C_(10))和重烃组分(C_(11)+)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。Based on PVT experiments and multi-round CO_(2)/hydrocarbon gas injection physical simulation experiments,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 experimental 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 CO_(2)injection has better effects on crude oil expansion and viscosity reduction than hydrocarbon gas injection does.In addition,injecting CO_(2)/hydrocarbon gas can transform Gulong shale oil from a weakly volatile reservoir to a volatile reservoir.Injecting hydrocarbon gas first and then injecting CO_(2)can further transition Gulong shale oil from a volatile reservoir to a condensate gas reservoir.The dissolved gas drive effect of Gulong shale oil after degassing is better,and the produced oil phase presents a continuous foam oil state.Injecting CO_(2)/hydrocarbon gas can supplement the dissolution gas and elastic energy of formation crude oil.Injecting CO_(2)has a better extraction effect on the intermediate hydrocarbon components(C_(5)-C_(10))and heavy hydrocarbon components(C_(11)+)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CO_(2)/烃类气 多周期注气采油 溶解气驱 组分传质 

分 类 号：TE312[石油与天然气工程—油气田开发工程]