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CO2提高天然气采收率的重力效应与气藏压力影响模拟
刘树阳1,2,孙宝江1,2,宋永臣3,张毅3
(1.非常规油气开发教育部重点实验室(中国石油大学(华东)),山东青岛 266580;2.中国石油大学(华东)石油工程学院, 山东青岛 266580;3.大连理工大学能源与动力学院,辽宁大连 116024)
摘要:
利用TOGUH2开展均质天然气藏模型中实施CO2提高天然气采收率的模拟研究,分析重力效应作用机制和气藏压力对CO2运移和CH4采收率变化规律的影响,为CO2提高天然气采收率的工程应用提供指导。模拟结果表明:重力效应抑制CO2向上运移,减缓了CO2与天然气纵向方向的混相,间接促进水平方向运移,导致气藏内CO2水平运移速率显著大于纵向运移速率,但是CH4采收率曲线不仅受重力效应影响,也受CO2注入流速和气藏压力的综合影响;气藏内的CH4生产时间及最终采收率随气藏压力降低而增加,在枯竭状态的低气藏压力条件下实施CO2提高天然气采收率能够获得更好的CH4采收率,但生产时间相对较长;较高气藏压力条件下,CO2为超临界状态,重力效应作用明显,CO2快速沉降并优先驱替气藏底层CH4,但是容易从生产井底部自下而上突破至生产井,提高天然气采收率效果不佳。
关键词:  CO2提高天然气采收率  重力效应  CO2运移  气藏压力影响
DOI:10.3969/j.issn.1673-5005.2020.03.009
分类号::TQ 28
文献标识码:A
基金项目:国家自然科学基金项目(U1762216);教育部“长江学者”创新团队项目(IRT_14R58)
Simulation on gravity effect and reservoir pressure influence analysis in CO2 enhanced gas recovery
LIU Shuyang1,2, SUN Baojiang1,2, SONG Yongchen3, ZHANG Yi3
(1.Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)), Ministry of Education, Qingdao 266580, China;2.School of Petroleum Engineering in China University of Petroleum(East China), Qingdao 266580, China;3.School of Energy and Power Engineering in Dalian University of Technology, Dalian 116024, China)
Abstract:
In this study, TOGUH2 simulator was applied to simulate CO2 enhanced natural gas recovery (CO2-EGR) with a homogeneous natural gas reservoir model, in which the gravity effect and influence of reservoir pressure on CO2 migration and CH4 recovery were studied in order to provide theoretical support for the application of the CO2-EGR technique. The simulation results show that the gravity effect can inhibit upward migration of CO2 and slow down the vertical mixing of CO2 and CH4, which can indirectly promote the horizontal migration and make the horizontal displacing rate significantly greater than the vertical one. However, the produced curve of CH4 is not only determined by gravity effect, but also affected by CO2 injection rate and reservoir pressure. The CH4 production time and final recovery efficiency increase with the decrease of reservoir pressure, and better CH4 recovery efficiency can be achieved at the depleted reservoir pressure than other operation conditions, while the production duration can be relatively longer. When CO2 is in a supercritical state at relatively high reservoir pressure, the gravity effect can have relatively significant effect on the displacement process. CO2 can rapidly sink and preferentially displace CH4 in the bottom layer of the gas reservoir, but it can break through vertically from the bottom of the production well, resulting in a poor natural gas recovery.
Key words:  CO2 enhanced gas recovery  gravity effect  CO2 migration  pressure effect of gas reservoir
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