Extraction and Its Effects on Crude Oil Properties During CO2 Flooding
Extraction and Its Effects on Crude Oil Properties During CO2 Flooding
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DOI：
10.1080/15567036.2013.816804
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发表时间：
2013-10
期刊：
影响因子：
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通讯作者：
M. Ding;X. Yue;H. Zhao;W. Zhang
中科院分区：
文献类型：
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作者：
M. Ding;X. Yue;H. Zhao;W. Zhang
利用高温高压压力、体积、温度实验装置模拟原油CO2抽提过程，通过测定CO2体积抽提率以及原油组成和粘度，研究了压力和注气量对抽提的影响，以及抽提对原油性质的影响。实验结果表明，CO2萃取率随压力的增加而增加，在46 MPa压力下萃取，CO2可提高原油采收率59.3%。在相同压力下，CO2的提取率是烃类气体的提取率的5-10倍。随着压力的升高，抽出油和抽出后的残油的重质组分含量和粘度均增加，抽出油粘度小于原油粘度，残油粘度可达原油粘度的10倍以上。在实验范围内，随着CO2注入量的增加，原油的采出率略有增加，采出油的组成和粘度基本不变，而残余油的重组分含量和粘度则大幅度增加。粘度可达原油的8.3倍。由此可见，当CO2注入量大于原油注入量时，CO2注入量的增加对采出率的影响非常有限，但会使剩余油粘度大幅度增加。
In this article, using the high-temperature and high-pressure pressure, volume, and temperature experimental equipment to simulate the CO2 extraction process of the crude oil, the effects of pressure and gas injection volume on extraction, and the extraction effects on oil properties were studied by measuring the CO2 volume extraction ratio as well as the composition and viscosity of the oil. The experimental results show that the CO2 extraction ratio increases with the increase of the pressure and the CO2 can enhance the oil recovery by 59.3% through the extraction under the pressure of 46 MPa. At the same pressure, the CO2 extraction ratio is 5–10 times as large as that of the hydrocarbon gas. The heavy component content and viscosity of both extracted oil and residual oil after the extraction increase as the pressure increases, meanwhile the extracted oil viscosity is smaller than that of the original oil, and the residual oil viscosity can reach 10 times as large as that of the original oil. Within the experiments, as the CO2 injection volume increases, the extraction ratio of the oil increases slightly, and the composition and viscosity of the extracted oil remains basically unchanged, but the heavy component content and viscosity of the residual oil increase greatly. The viscosity can reach 8.3 times as large as that of the original oil. Thus, it can be seen that when the CO2 injection volume is bigger than that of the oil, the increase of it has a very limited effect on the extraction ratio, but can make the residual oil viscosity increase greatly.