扶余致密油藏CO2吞吐参数优化设计

doi:10.3969/j.issn.1006-6535.2024.03.016

特种油气藏 ›› 2024, Vol. 31 ›› Issue (3): 123-128.DOI: 10.3969/j.issn.1006-6535.2024.03.016

扶余致密油藏CO₂吞吐参数优化设计

姚同玉^1,2, 孙灵辉³, 崔传智^1,2

1.非常规油气开发教育部重点实验室,山东青岛 266580;
2.中国石油大学(华东),山东青岛 266580;
3.中国石油勘探开发研究院,北京 100083

收稿日期:2023-09-25 修回日期:2024-03-18 出版日期:2024-06-25 发布日期:2024-07-26
作者简介:姚同玉(1976—),女,副教授,1998年毕业于石油大学(华东)石油工程专业,2005年毕业于中国科学院渗流流体力学研究所流体力学专业,获博士学位,现主要从事油气渗流理论和提高采收率方面的教学和科研工作。
基金资助:
国家自然科学基金“致密油藏多段压裂水平井时空耦合流动模拟及参数优化方法”(51974343)

Optimization Design of CO₂ Huff-n-Puff Parameters in Fuyu Tight Reservoir

Yao Tongyu^1,2, Sun Linghui³, Cui Chuanzhi^1,2

1. Key Laboratory of Unconventional Oil and Gas Development, Ministry of Education, Qingdao, Shandong 266580, China;
2. China University of Petroleum (East China), Qingdao, Shandong 266580, China;
3. Research Institute of Petroleum Exploration & Development, Beijing 100083, China

Received:2023-09-25 Revised:2024-03-18 Online:2024-06-25 Published:2024-07-26

摘要/Abstract

摘要： 为解决致密油开采初期产量递减快、采收率低的问题,结合扶余致密油藏岩石和流体性质,采用数值模拟方法,研究了注入时机、注入压力对CO₂吞吐采油效果的影响,优化工程参数,分析了致密油CO₂吞吐过程中的油藏压力分布特征、界面张力分布特征以及致密油CO₂吞吐开发的可行性。研究表明:油层压力系数降至0.65左右时开展CO₂吞吐,CO₂可与原油充分接触,有利于发挥CO₂原油溶解作用,提高开采效果;注入压力接近最小混相压力时,CO₂以游离相进入基质,更易进入基质深处,与致密油充分接触,并在原油中溶解混相,改善开发效果。溶解平衡后,CO₂与致密油界面张力随时间快速增加,以此确定闷井时间。研究确定了CO₂吞吐采油最佳工程参数,即注入量为8 000 t,注入速度为120 t/d,注入压力为27 MPa,闷井时间为30 d,计算该方案下增油量为3 084 t,换油率为0.39。水平井现场试验也证明CO₂吞吐技术应用于扶余致密油藏,采收率提高了1.38～3.33个百分点。研究结果对拓展致密油藏CO₂吞吐开采技术的应用具有重要意义。

关键词: 致密油, CO₂吞吐, 参数优化, 压力分布, 界面张力, 扶余油藏

Abstract: To address the issues of high production decline rate and low recovery rate in the early stage of tight oil development,considering the rock and fluid properties of Fuyu tight oil reservoir, numerical simulation methods were used to study the effects of injection timing and injection pressure on the effect of CO₂ huff-n-puff.The engineering parameters were optimized, the characteristics of reservoir pressure distribution and interfacial tension distribution are analyzed,the operability of CO₂ huff-n-puff development of tight oil is studied.The results indicate that CO₂ huff-n-puff should be implemented when the oil reservoir pressure coefficient drops to around 0.65.At this time,CO₂ can fully contact with crude oil,which is beneficial for the dissolution,thereby improving the recovery efficiency.As the injection pressure approaches the minimum miscible pressure,CO₂ in a separate phase enters the matrix,making full contact with the tight oil deep within.The dissolved miscible phase improves the development effect.After reaching dissolution equilibrium,the interfacial tension between CO₂ and tight oil increases rapidly over time,the time of well shut-in can be determined at this moment.The optimal engineering parameters for CO₂ huff-n-puff recovery in this study are:the injection volume is 8000 t,the injection rate is 120 t/d, the injection pressure is 27 MPa,and the time of well shut-in is 30 d. According to this scheme, the increase of crude oil production is calculated to be 3 084 t,and the oil replacement ratio is calculated to be 0.39. The in-situ test of horizontal well also confirms that the application of CO₂ huff-n-puff technology in Fuyu tight oil reservoir increased the recovery rate by 1.38 to 3.33 percentage points.The research results are of great significance for further expanding the application of CO₂ huff-n-puff technology in tight oil reservoirs.

Key words: tight oil, CO₂ huff-n-puff, parameter optimization, pressure distribution, interfacial tension, Fuyu Reservoir

中图分类号:

TE312

姚同玉, 孙灵辉, 崔传智. 扶余致密油藏CO₂吞吐参数优化设计[J]. 特种油气藏, 2024, 31(3): 123-128.

Yao Tongyu, Sun Linghui, Cui Chuanzhi. Optimization Design of CO₂ Huff-n-Puff Parameters in Fuyu Tight Reservoir[J]. Special Oil & Gas Reservoirs, 2024, 31(3): 123-128.

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扶余致密油藏CO₂吞吐参数优化设计

Optimization Design of CO₂ Huff-n-Puff Parameters in Fuyu Tight Reservoir

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