期刊
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME
卷 141, 期 9, 页码 -出版社
ASME
DOI: 10.1115/1.4043131
关键词
X-ray micro-computed tomography; remaining oil distribution; patterns of oil cluster; pore-scale imaging; pore network model
资金
- National Natural Science Foundation of China [51674280, 51490654, 51804328, 51722406, 61573018]
- Key Research and Development Plan of Shandong Province [2018GSF116009]
- Shandong Province Natural Science Foundation [JQ201808, ZR2018BEE008]
- Fundamental Research Funds for the Central Universities [17CX05003, 18CX02168A]
- National Science and Technology Major Project [2016ZX05010002005]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT_16R69]
- Introducing Talents of Discipline to Universities [B08028]
To investigate the characteristics of oil distribution in porous media systems during a high water cut stage, sandstones with different permeability scales of 53.63 x 10(-3) mu m(2) and 108.11 x 10(-3) mu m(2) were imaged under a resolution of 4.12 mu m during a water flooding process using X-ray tomography. Based on the cluster-size distribution of oil segmented from the tomography images and through classification using the shape factor and Euler number, the transformation of the oil distribution pattern in different injection stages was studied for samples with different pore structures. In general, the distribution patterns of an oil cluster continuously change during water injection. Large connected oil clusters break off into smaller segments. The sandstone with a higher permeability (108.11 x 10(-3) mu m(2)) shows the larger change in distribution pattern, and the remaining oil is trapped in the pores with a radius of approximately 7-12 mu m. Meanwhile, some disconnected clusters merge together and lead to a re-connection during the high water cut period. However, the pore structure becomes compact and complex, the residual nonwetting phase becomes static and is difficult to move; and thus, all distribution patterns coexist during the entire displacement process and mainly distribute in pores with a radius of 8-12 mu m. For the pore-scale entrapment characteristics of the oil phase during a high water cut period, different enhance oil recovery (EOR) methods should be considered in sandstones correspondent to each permeability scale.
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