NMR-Based Experiments of Fracturing Fluid Assisted CO2 Huff-n-Puff for Enhancing Shale Oil Recovery

doi:10.12388/j.issn.1673-2677.2024.03.010

Abstract

Abstract:

To develop a huff-n-puff development mode of shale oil facilitating continuous reservoir energy supplement，the integrated simulation experiment of CO₂ huff-n-puff assisted by fracturing fluids for Jimsar shale oil reservoir was completed using low frequency nuclear magnetic resonance （NMR） core analyzer. The characteristics of pore throat fluid production and recovery rate variation of the core during the composite development of multi-medium cyclic injection and flooding were investigated to evaluate the enhanced oil recovery （EOR） performance of the fracturing fluid-assisted CO₂ huff-n-puff. Finally，the novel development mode of huff-n-puff energy supplement was proposed for shale oil. The experimental results showed that in the case of conventional CO₂ huff-n-puff，the recovery rate of core samples decreases rapidly from cycle to cycle，and only the oil in medium and large pores is produced. The oil production is mainly contributed by the first two cycles，and the ultimate recovery factor is 30%~40%. For the CO₂ huff-n-puff assisted by fracturing fluids，in which the CO₂ injection end was used for production，the produced oil is also mostly limited to medium and large pores. The oil production is mainly attributed to the first three cycles，and the ultimate recovery factor is 30%~40%. In terms of the CO₂ huff-n-puff assisted by fracturing fluids，with the fracturing fluid injection end used for production，the oil in all pores is produced，and the ultimate recovery factor is 70%~80%. This mode leaves evenly distributed remaining oil and the highest development performance. The findings of this research provide a theoretical basis for the field practice of shale oil EOR based on huff-n-puff reservoir energy supplement.

Key words:

shale oil；CO₂ , huff-n-puff；fracturing fluid；enhanced oil recovery （EOR）；nuclear magnetic resonance （NMR）

摘要：

摘要：为获取可实现连续补能的页岩油吞吐开发方式，以吉木萨尔页岩油储层为研究对象，借助低频核磁共振岩心分析仪和完成了压裂液辅助CO₂吞吐补能一体化模拟实验。分析岩样在多介质吞吐与驱替组合的开发过程中孔喉流体动用特征和采收率变化特征，评价压裂液辅助CO₂吞吐提高采收率效果，提出页岩油补能吞吐开发新方式。实验结果表明，CO₂吞吐，岩样采收率随吞吐周期快速下降，仅动用中大孔中原油，产油量主要源于前2个周期，最终采收率在30%～40%之间；压裂液辅助CO₂吞吐并采用CO₂注入端生产，原油主要产自中大孔，且产油量源于前3个周期，最终采收率在30%～40%之间；压裂液辅助CO₂吞吐并采用压裂液注入端生产，全部孔隙中原油均得到动用，最终采收率在70%～80%之间，剩余油分布均匀，表现出最好的开发效果。研究可为矿场吞吐补能提高页岩油采收率实践提供一定的理论基础。

关键词:

页岩油, CO₂吞吐, 压裂液, 提高采收率, 核磁共振

CLC Number:

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TE357

XIAO Wenlian, CHEN Shengen, YI Yonggang, CHEN Haoyu, REN Jitian.

NMR-Based Experiments of Fracturing Fluid Assisted CO₂ Huff-n-Puff for Enhancing Shale Oil Recovery [J]. Xinjiang Oil & Gas, 2024, 20(3): 83-90.

肖文联, 陈神根, 易勇刚, 陈浩宇, 任吉田.

压裂液辅助二氧化碳吞吐提高页岩油采收率核磁共振实验 [J]. 新疆石油天然气, 2024, 20(3): 83-90.

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NMR-Based Experiments of Fracturing Fluid Assisted CO₂ Huff-n-Puff for Enhancing Shale Oil Recovery

压裂液辅助二氧化碳吞吐提高页岩油采收率核磁共振实验

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