Integrated CO2 fracturing-flooding-storage technology for low-permeability tight oil reservoirs and its field practice

doi:10.7623/syxb202601009

Acta Petrolei Sinica ›› 2026, Vol. 47 ›› Issue (1): 120-133.DOI: 10.7623/syxb202601009

• CO₂ EOR AND SEQUESTRATION • Previous Articles

Integrated CO₂ fracturing-flooding-storage technology for low-permeability tight oil reservoirs and its field practice

Wang Xiangzeng^1,2,3, Yang Hong^1,4,5, Sun Xiao^1,5

1. Shaanxi Key Laboratory of CO₂ Sequestration and Enhanced Oil Recovery, Shaanxi Xi'an 710065, China;
2. Shaanxi Yanchang Petroleum (Group)Co., Ltd., Shaanxi Xi'an 710065, China;
3. Research Institute of Carbon Neutrality Future Technology, Xi'an Shiyou University, Shaanxi Xi'an 710000, China;
4. Department of Geology, Northwest University, Shaanxi Xi'an 710004, China;
5. Research Institute, Shaanxi Yanchang Petroleum (Group) Co., Ltd., Shaanxi Xi'an 710065, China

Received:2025-09-09 Revised:2025-12-26 Published:2026-02-12

低渗透致密油藏CO₂压裂—驱油—封存一体化技术及矿场实践

王香增^1,2,3, 杨红^1,4,5, 孙晓^1,5

1. 陕西省二氧化碳封存与提高采收率重点实验室陕西西安 710065;
2. 陕西延长石油(集团)有限责任公司陕西西安 710065;
3. 西安石油大学碳中和未来技术研究院陕西西安 710000;
4. 西北大学地质学系陕西西安 710004;
5. 陕西延长石油(集团)有限责任公司研究院陕西西安 710065

通讯作者: 杨红,男,1986年12月生,2014年获中国石油大学(北京)硕士学位,现为陕西延长石油(集团)有限责任公司研究院博士创新工作室领衔人、教授级高级工程师,西北大学博士研究生,主要从事CO₂驱油提高采收率与地质封存理论技术研究。Email:yh_cup2011@sina.com
作者简介:杨红,男,1986年12月生,2014年获中国石油大学(北京)硕士学位,现为陕西延长石油(集团)有限责任公司研究院博士创新工作室领衔人、教授级高级工程师,西北大学博士研究生,主要从事CO₂驱油提高采收率与地质封存理论技术研究。Email:yh_cup2011@sina.com
基金资助:
陕西省重点研发计划项目(2025CY-GJHX2-02)、国家重点研发计划项目(2022YFE0206700)和陕西省自然科学基础研究计划项目(2024JC-YBMS-387)资助。

Abstract

Abstract: To address the challenges in CO₂ flooding and sequestration in Yangchang oilfield, including low-permeability reservoir with poor gas injection performance, difficulty in achieving miscibility under low formation pressure, and limited sweep efficiency in immiscible flooding, the study explores a new technical path for significantly enhanced oil recovery and high-efficiency carbon storage in low-permeability tight oil reservoirs. The paper systematically elaborates the integrated CO₂ fracturing-flooding-storage technology in Yanchang oilfield and its field practice, and proposes a new theoretical understanding that expanding sweep volume, enhancing miscibility and imbibition constitute the main mechanisms of the integrated CO₂ fracturing-flooding technology for enhanced oil recovery. Correspondingly, an enhanced oil recovery technology has been developed, focusing on CO₂-induced fracture extension and reservoir stimulation, miscibility enhancement, improved imbibition oil displacement, and gas channeling control and prevention. Besides, this study reveals the dynamic evolution mechanism of CO₂ storage in reservoirs,clarifies the long-term sealing mechanism of cap rocks, and establishes corresponding sealing performance evaluation methods. To further ensure CO₂ storage safety, a full-space monitoring system for reservoirs has been constructed. Based on the above technology, oilfield tests demonstrate the cumulative incremental oil production of 2.6×10⁴ tons, safe and effective sequestration of 124 000 metric tonnes of CO₂, and an estimated 12.1 % increase in enhanced oil recovery. Field practice in Yanchang oilfield shows that the integrated CO₂ fracturing-flooding and storage technology has significant application potential in low-permeability tight oil reservoirs.

Key words: CO₂ fracturing-flooding-storage, immiscible displacement, sweep volume, imbibition, storage status, monitoring system, low-permeability tight oil reservoirs

摘要： 针对延长油田开展CO₂驱油与封存面临储层致密注气能力低、地层压力低混相难、非混相条件CO₂波及范围小等难题,将CO₂压裂与驱油结合,探索形成了一条低渗透致密油藏大幅度提高采收率和高效碳封存的新技术路径。通过系统阐述延长油田CO₂压裂—驱油—封存一体化技术及矿场实践,提出了"扩波及、促混相、强渗吸"是CO₂压裂—驱油协同提高采收率的主要机理,建立了以CO₂扩缝增效、提高混相程度、强化渗吸驱油和气窜防控为核心的提高采收率技术;揭示了油藏CO₂封存状态演变规律,明确了盖层长期封闭机理并建立了区域盖层封闭性评价方法,构建了油藏地质体全空间"三位一体"CO₂监测体系,矿场试验累积增油量为2.6×10⁴t,安全有效封存CO₂为12.4×10⁴t,预测提高采收率12.1 % 。延长油田的矿场实践表明,CO₂压裂—驱油—封存一体化技术在低渗透致密油藏具有广阔的应用前景。

关键词: CO₂压裂—驱油—封存, 非混相, 波及体积, 渗吸, 封存状态, 监测体系, 低渗透致密油藏

CLC Number:

TE357

Wang Xiangzeng, Yang Hong, Sun Xiao. Integrated CO₂ fracturing-flooding-storage technology for low-permeability tight oil reservoirs and its field practice[J]. Acta Petrolei Sinica, 2026, 47(1): 120-133.

王香增, 杨红, 孙晓. 低渗透致密油藏CO₂压裂—驱油—封存一体化技术及矿场实践[J]. 石油学报, 2026, 47(1): 120-133.

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Integrated CO₂ fracturing-flooding-storage technology for low-permeability tight oil reservoirs and its field practice

低渗透致密油藏CO₂压裂—驱油—封存一体化技术及矿场实践

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