玉果油田果8区块减氧空气驱低温氧化对采收率的影响
Influences of Low-Temperature Oxidation on Oil Recovery During Oxygen-Reduced Air Flooding in Guo-8 Block of Yuguo Oilfield
肖志朋 1张彦斌 1李启航 2李宜强 2韩继凡 1闫茜 1吴永恩2
作者信息
- 1. 中国石油 吐哈油田分公司 勘探开发研究院,新疆 哈密 839009
- 2. 中国石油大学(北京) 油气资源与工程全国重点实验室,北京 102249;中国石油大学(北京)石油工程学院,北京 102249
- 折叠
摘要
注减氧空气是低渗透油藏有效的开发手段,减氧空气可在地层条件下与原油发生低温氧化反应,提高采收率.针对玉果油田果8区块目前减氧空气驱提高采收率机理认识不完善的问题,采用等温氧化实验和长岩心驱替实验探究原油氧化过程和生成物质对提高采收率的影响.等温氧化实验结果表明,稀油的低温氧化过程产生了沉积物质,随着温度升高,氧化程度明显提高,89℃时原油氧化生成重质组分沉积量为1.25×10-3 g/g,100℃时为3.43×10-3 g/g,120℃时为5.02×10-3 g/g.长岩心驱替实验结果表明,不同氧化温度下重质组分沉降对采收率存在影响,随着温度升高,气窜时机变晚,波及效果变好,最终采收率有所提高,温度为89℃、100℃和120℃时的最终采收率分别为52.77%、58.89%和65.23%.
Abstract
Oxygen-reduced air injection is an effective technique for developing low-permeability oil reservoirs.Under reservoir conditions,oxygen-reduced air can undergo low-temperature oxidation reaction with crude oil,thereby enhancing oil recovery.Regarding the inade-quate understanding of the mechanism underlying the oxygen-reduced air flooding for enhanced oil recovery(EOR)in the Guo-8 block of the Yuguo oilfield,isothermal oxidation experiments and long-core displacement experiments were conducted to investigate the influences of oil oxidation process and generated substances on EOR.The results of the isothermal oxidation experiments indicate that sedimentary substances are generated during the low-temperature oxidation process of light oil.With the increase of temperature,the degree of oxidation significantly increases,with the sedimentation of heavy components reaching 1.25×10-3 g/g at 89℃,3.43×10-3 g/g at 100℃,and 5.02×10-3 g/g at 120℃.The results of the long-core displacement experiments demonstrate that the sedimentation of heavy components at different oxidation tem-peratures affects EOR.With temperature increasing,the timing of gas channeling delays,the sweeping effect improves,and the final recov-ery increases to 52.77%,58.89%,and 65.23%at temperatures of 89℃,100℃,and 120℃,respectively.
关键词
玉果油田/果8区块/减氧空气驱/低温氧化/轻质原油/提高采收率/气相色谱/长岩心驱替实验/组分分析Key words
Yuguo oilfield/Guo-8 block/oxygen-reduced air flooding/low-temperature oxidation/light oil/EOR/gas chromatography/long-core displacement experiment/component analysis引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据