摘要
在油田开发过程中,大量用于驱油并伴随原油采出的CO_(2)和轻烃(C_(2)~C_(5))被直接排放,不仅浪费资源,还污染环境,不符合CO_(2)驱油环保理念,回收CO_(2)和高附加值的轻烃势在必行。为此,通过分析某CO_(2)捕集、利用与封存(CCUS)示范区建成后伴生气组分的变化,优选聚乙烯胺膜、聚二甲基硅氧烷膜针对伴生气中的CO_(2)和轻烃开展室内分离试验,采用PROⅡ软件对伴生气分离整体流程进行了模拟仿真、开展了流程优化设计和装置试制,确定了膜技术分离油田伴生气中CO_(2)和轻烃的适用性,并开展了现场试验。研究结果表明:①随着CCUS示范区CO_(2)的注入,CO_(2)对地层中的轻烃组分具有一定的萃取作用,并导致其含量逐渐上升,需要回收被采出至地面的CO_(2)和高附加值的轻烃;②聚乙烯胺膜对CO_(2)具有强促进传递作用,CO_(2)浓度、温度、湿度为主要影响因素,CO_(2)两级分离率可达到96%;③聚二甲基硅氧烷膜对轻烃具有良好的选择性,碳值越高选择性越好,压力比、温度为主要影响因素,分离率最高可达70%;④聚乙烯胺和聚二甲基硅氧烷2种膜均具有优异的长期运行稳定性,印证了膜法分离CO_(2)和轻烃的能力;⑤试制膜分离撬装装置600 h现场试验装置运行稳定,分离效果和室内试验及数值模拟数据基本吻合。结论认为,采用纯膜法分离油田伴生气中的CO_(2)和轻烃投资低、能耗低,节能环保,具备长期应用的潜力。
In the process of oilfield development,a large amount of CO_(2) which is used for oil recovery and produced along with the production of crude oil and light hydrocarbons(C_(2)-C_(5))are discharged directly,which not only wastes resources but also pollutes the environment.Obviously,it is not in line with the environmental protection concept of CO_(2) flooding,so it is imperative to recover CO_(2) and high value-added light hydrocarbons.In this paper,the changes in the compositions of the associated gas after the construction of a CO_(2) capture,utilization,and storage(CCUS)demonstration area are analyzed.Based on this,polyvinylamine(PVAm)membrane and polydimethylsiloxane membrane are selected to conduct laboratory separation experiments on CO_(2) and light hydrocarbons in associated gas.Then,PRO II software is used to simulate the overall process of associated gas separation and carry out optimal process design and trial device production.Finally,the applicability of the membrane technology to separate CO_(2)and light hydrocarbons from oilfield associated gas in oil fields is clarified,and on-site tests are conducted.And the following research results are obtained.First,as CO_(2) is injected into the CCUS demonstration area,it has a certain extraction effect on the light hydrocarbons in the formations while leading to a gradual increase in the compositions of light hydrocarbons.Therefore,it is imperative to recover produced CO_(2) and high value-added light hydrocarbons.Second,PVAm has a strong promoting effect on CO_(2) transfer,with CO_(2) concentration,temperature,and humidity as the main influencing factors.The two-stage separation rate of CO_(2) reaches 90%.Third,polydimethylsiloxane membrane has good selectivity for light hydrocarbons,and the higher the carbon value,the better the selectivity.Pressure ratio and temperature are the main influencing factors,and the highest separation rate can be up to 70%.Fourth,these two kinds of membranes are excellent in long-term operational stability,confirming the membrane method's ability to separate CO_(2) and light hydrocarbons.Fifth,during the 600 hours of the on-site test,the experimentally produced skid-mounted membrane separation device ran smoothly,with the separation effect basically consistent with laboratory test and numerical simulation results.In conclusion,the use of pure membrane method to separate CO_(2) and light hydrocarbons from oilfield associated gas is advantageous with low investment,low energy consumption,energy conservation and environmental protection,and has the potential for long-term application.
作者
张春威
刘瑛
孙晓
梁全胜
王涛
李鹤
康宇龙
ZHANG Chunwei;LIU Ying;SUN Xiao;LIANG Quansheng;WANG Tao;LI He;KANG Yulong(Research Institute,Shaanxi Yanchang Petroleum(Group)Co.Ltd.,Xi'an,Shaanxi 710075,China)
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2024年第4期68-75,共8页
Natural Gas Industry
基金
陕西延长石油(集团)有限责任公司科研项目“CO_(2)驱油田采出气多功能回收利用装置研发”(编号:ycsy2021jcts-A-05)。
关键词
CO_(2)驱油
聚乙烯胺膜
聚二甲基硅氧烷膜
油田伴生气
膜法分离
CO_(2)分离
烃类分离
CO_(2) flooding
Polyvinylamine(PVAm)membrane
Polydimethylsiloxane membrane
Oilfield associated gas
Membrane separation
CO_(2) separation
Hydrocarbon separation
