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Optimized foam-assisted CO_2 enhanced oil recovery technology in tight oil reservoirs

机译：优化的泡沫辅助CO_2在封闭油藏中的增强型油回收技术

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摘要

In this paper, foam-assisted CO2 EOR and anti-gas channelling technology are investigated and optimized to enhance tight oil recovery. A series of laboratory experiments, including pressure - volume - temperature, foam generation and evaluation, and coreflood tests, and phase behaviour theoretical mathematical models are performed to evaluate foam agent, analyze anti-gas channelling mechanisms and influential factors, and optimize foam-assisted CO2 EOR technique. The specific CO2 bulk fluid behaviour and phase behaviour in wellbore are determined through experimental and theoretical models. Two distinct stages are found to be divided prior to and after the CO2 gas breakthrough. Most oil productions, which is in the range of 28-40%, occur prior to the gas breakthrough, whereas only additional 5-8% oil is produced after the gas breakthrough. A higher injection rate and/or permeability ratio result in an earlier gas breakthrough and causes less oil to be produced before gas breakthrough while the oil recovery factor slightly increases after the breakthrough by increasing injection rate. Gas diffusion in water-saturated core reach equilibrium faster than that in the oil-saturated core. An overall evaluation parameter is developed to select foam agent. The optimized static condition for the selected foam agent here is approximately 9 MPa at low temperatures while dynamic performance is improved at a higher gas but lower liquid injection rate. The simultaneous water-alternating-gas injection scheme in subsequent of an initial gas injection with liquid - gas ratio of 1:1 performs better than the water-alternating-gas scheme, which is proven to be effective for the core samples with fracture width of 82.67 mu m. Finally, the oilfield surface foaming operational system is designed to upscale laboratory research to practical applications with specific operating setup and procedures, which has been applied in the target oil reservoir and performs well as expected.
机译：本文研究了泡沫辅助CO2 EOR和抗气体沟通技术，并优化以增强较紧的油回收。一系列实验室实验，包括压力 - 体积 - 温度，泡沫产生和评估，以及CoreFlood测试，以及相位行为理论数学模型进行评估泡沫代理，分析抗气体通道机构和影响因素，并优化泡沫辅助CO2 EOR技术。通过实验和理论模型确定井筒的特定CO2散装流体行为和相行为。发现两个不同的阶段在CO 2气体突破之前和之后分开。大多数石油制作，在煤气突破之前发生在28-40％的范围内，而仅在气体突破后仅生产额外的5-8％的油。较高的注射率和/或渗透率导致较早的气体突破，并且在气体突破前产生较少的油，而通过增加注射速率突破后的采油因子略有增加。水饱和核心的气体扩散达到比油饱和芯中的平衡速度快。开发了整体评估参数以选择泡沫代理。这里的所选泡沫剂的优化静态条件在低温下大约9MPa，而动态性能在更高的气体下改善但较低的液体注入速率。在初始气体注射的液体比例为1：1的初始气体注射之后的同时进行水交交流 - 气体注射方案比水交交配气体方案更好地执行，这被证明是对具有裂缝宽度的核心样品有效82.67 mu m。最后，油田表面发泡操作系统旨在对具有特定操作设置和程序的实际应用进行高档实验室研究，该应用程序已应用于目标储油储存器，并按预期执行良好。

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  • 来源
    《Fuel》 |2020年第may1期|117099.1-117099.19|共19页
  • 作者

    Zhang Kaiqiang; Li Songyan; Liu Lirong;

  • 作者单位

    Imperial Coll London Dept Chem Engn South Kensington Campus London SW7 2AZ England;

    China Univ Petr East China Coll Petr Engn Qingdao 266580 Peoples R China|China Univ Petr East China Key Lab Unconvent Oil & Gas Dev Minist Educ Qingdao 266580 Peoples R China;

    Univ Regina Inst Energy Environm & Sustainable Communities Regina SK S4S 0A2 Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    CO2 foam; Enhanced oil recovery; Gas channelling; Tight oil reservoirs; Optimization;

    机译：二氧化碳泡沫;增强的储油;气体渠道;拧紧油藏;优化;

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