LAPSE:2023.36450
Published Article
LAPSE:2023.36450
Microscopic Distribution and Development Strategy of Residual Oil in Tight Sandstone
Xiaodong Yi, Meiling Zhang, Guangshan Mu
August 2, 2023
Pore and permeability are distributed discontinuously and unevenly in the dominant sedimentary model of the lateral accretion body inside the meandering river point bar of the Fuyang reservoir of the Yushulin oilfield. Based on the water flooding experiments of field core samples, the influence of pore permeability conditions on residual oil distribution type and water cutting rate was studied by using the microscopic visualization technology enabled through a photolithographically fabricated glass model. It is found that the residual oil in samples shows five discontinuous types, which are cluster, columnar, oil droplet, membrane, and blind end. In the stages with low, medium, and high water cutting rates, the proportion of clustered residual oil in the samples with different permeability is high, reflecting the situation that it is difficult for injected water to spread widely in tight oil reservoirs. With the decrease of permeability, the proportion of membrane and blind end residual oil gradually increases, which indicates that the thin pore throat can produce large restrictions on residual oil, resulting in residual oil enrichment. At the same time, the water flooding experiment was carried out by changing the displacement direction and periodic water injection. It was found that changing the displacement direction was beneficial to the recovery of residual oil in the thin pore throat and avoided the dominant seepage of injected water in the big pore throat, and the recovery rate was increased by more than 2.14%. Periodic water injection, which was conducive to adjusting the displacement pressure difference, reduced the constraining force of the throat on residual oil and increased the recovery rate by more than 3.98%. The actual well area with closed coring wells and dynamic production data is preferred for the application of experimental research results. Changing displacement direction and periodic water injection increased the residual oil recovery by more than 3%.
Keywords
microscopic visualization technology, oil recovery strategy, pore and permeability condition, residual oil, tight sandstone, water flooding
Subject
Suggested Citation
Yi X, Zhang M, Mu G. Microscopic Distribution and Development Strategy of Residual Oil in Tight Sandstone. (2023). LAPSE:2023.36450
Author Affiliations
Yi X: School of Earth Science, Northeast Petroleum University, Daqing 163318, China; Yushulin Oilfield Development Company, Daqing 163000, China
Zhang M: School of Earth Science, Northeast Petroleum University, Daqing 163318, China
Mu G: Yushulin Oilfield Development Company, Daqing 163000, China
Journal Name
Processes
Volume
11
Issue
7
First Page
1907
Year
2023
Publication Date
2023-06-25
Published Version
ISSN
2227-9717
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Original Submission
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PII: pr11071907, Publication Type: Journal Article
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LAPSE:2023.36450
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doi:10.3390/pr11071907
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Aug 2, 2023
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CC BY 4.0
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Aug 2, 2023
 
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Calvin Tsay
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