双碳愿景下中国石化不同油藏类型CO2驱提高采收率技术发展与应用

doi:10.13809/j.cnki.cn32-1825/te.2021.06.01

Abstract

Abstract:

CO₂ flooding has the dual purpose of enhancing oil recovery（EOR） and carbon dioxide storage, and has a large development prospect. In particular, the need of carbon emission reduction gives a large space for the development of large-scale application of this technology. For Sinopec, the development history of CO₂ flooding can be divided into three stages: single well stimulation, pilot test and comprehensive application. After more than 50 years of development, CO₂ flooding mechanism and supporting technology have been relatively mature. According to the reservoir characteristics of Sinopec and three types of CO₂ flooding, which are miscible drive, near miscible drive and immiscible drive, the screening standard of CO₂ drive reservoir are established to clarify the mechanism of CO₂ flooding in low permeability reservoir, tight reservoir, medium and high permeability reservoir. Taking three reservoirs of Subei Basin, Fu-3 member of Caoshe Oilfield, Fu-3 member in Hua-26 fault block, and Duo-1 member of Zhoucheng Oilfield, and Gao-89-1 block of Zhengli Zhuanggao Block in Bohai Bay Basin as examples, the actual development effect of typical blocks are summarized, showing that CO₂ flooding is an important way to improve oil recovery efficiency. In order to solve the technical bottleneck of large-scale application of CO₂ flooding in low permeability reservoirs and medium-high permeability reservoirs, the researches on oil displacement mechanism and gas injection effect should be further strengthened to promote the development of CCUS. It is of great significance to achieve “carbon peak” and “carbon neutral” and ensure national energy security.

Key words: carbon capture, utilization and storage（CCUS）, CO₂ flooding, different reservoir type, enhanced oil recovery, mechanism, standard, development effect

CLC Number:

TE357

LI Yang,HUANG Wenhuan,JIN Yong,HE Yingfu,CHEN Zuhua,TANG Yong,WU Gongyi. Different reservoir types of CO₂ flooding in Sinopec EOR technology development and application under “dual carbon” vision[J].Petroleum Reservoir Evaluation and Development, 2021, 11(6): 793-804.

Figures/Tables 12

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References 28

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类型	原油相对密度	深度（m）	原油黏度/（mPa·s）
CO₂混相驱	<0.825 1	>762	<10
	0.865~0.825	>853
	0.887~0.865	>1 006
	0.922~0.887	>1 219
CO₂非混相驱	0.920~0.980	549	<600

筛选参数	原油黏度（mPa·s）	原油密度（g/cm³）	剩余油饱和度	油藏深度（m）	地层温度（℃）
CO₂混相驱	<10	<0.876	>30	>1 000	<120
CO₂近混相驱	<50	<0.922	>30	>1 000	<120
CO₂非混相驱	<600	<0.980	>40	>600	<120
对应因素	混相特征,注入能力	混相能力	EOR潜力	混相能力	混相能力
筛选参数	渗透率（10^-3μm²）	变异系数	油藏压力	储量规模（10⁴t）	提高采收率幅度（%）
CO₂混相驱	>1	<0.75	p_地>1.0 p_MMP	>100	>12
CO₂近混相驱	>1	<0.75	p_地=0.8~1.0 p_MMP	>100	>8
CO₂非混相驱	>1	<0.55	p_地<0.8 p_MMP	>100	>6
对应因素	注入能力	波及系数	混相条件	封存能力及投资管理	经济效益

Different reservoir types of CO₂ flooding in Sinopec EOR technology development and application under “dual carbon” vision

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Different reservoir types of CO2 flooding in Sinopec EOR technology development and application under “dual carbon” vision

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Different reservoir types of CO₂ flooding in Sinopec EOR technology development and application under “dual carbon” vision