Experimental investigation into the enhancement of oil recovery and analysis of influencing factors for hydrocarbon gas flooding in high-water-cut ultra-deep oil reservoirs

被引：0
作者：
Li, Zongfa [1 ,2 ]
Luo, Xu [1 ,2 ]
Kanjibayi, Bahedawulieti [3 ]
Wu, Yi [1 ,2 ]
Yang, Guihua [1 ,2 ]
Zhao, Hui [1 ,2 ]
Huang, Lijuan [1 ,2 ]
Zhou, Yuhui [1 ,2 ]
机构：
[1] Yangtze Univ, Coll Petr Engn, Wuhan 430100, Peoples R China
[2] Yangtze Univ, Western Res Inst, Karamay 834000, Peoples R China
[3] Sinopec Petr Engn Design Co Ltd, Dongying 257000, Shandong, Peoples R China
来源：
PHYSICS OF FLUIDS | 2024年 / 36卷 / 12期
关键词：
CARBON-DIOXIDE; BEHAVIOR; SHALE; EOR;
D O I：
10.1063/5.0243682
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
Deep oil reservoirs, characterized by high temperature and high pressure, are conducive for enhancing the miscibility between gas and crude oil, thereby improving oil recovery. This paper focuses on a high-water-cut deep oilfield in Xinjiang and experimentally investigates the potential and influencing factors of gas flooding for enhancing oil recovery. These factors include permeability, type of injection gas, injection rate, injection pressure, and injection method. Based on geological characteristics, three types of experimental long-core samples: high permeability, medium permeability, and low permeability, were selected. Hydrocarbon gas injection experiments were conducted after water flooding at conditions of 112 degrees C and 55 MPa to evaluate displacement effects. Results indicated that high permeability cores exhibited the best displacement, with gas flooding recovery rates 39.53% higher than those from water flooding. Low permeability cores demonstrated a 35.46% increase in oil recovery, significantly surpassing the 29.31% increase observed in medium permeability layers. Among the four flooding media tested, CO2 was found to have the best displacement effect, increasing oil recovery by 33.22%, followed by hydrocarbon gas and associated gas, while N-2 was the least effective (7.27%). Higher injection pressures (55 MPa) notably improved the final recovery degree, resulting in a 41.40% increase. Additionally, alternating injections of water and gas enhanced recovery by 13.02% compared to continuous gas injection. A lower injection rate of 0.5 ml/min improved recovery by 7% over 1 ml/min. Therefore, for medium permeability layers under high-water-cut conditions, the optimal gas injection scheme consists of using hydrocarbon gas as the injection medium, with an injection flow of 0.5 ml/min and a pressure of 55 MPa, employing a water-gas alternating injection mode. This study provides valuable experimental and theoretical support for enhancing oil recovery through gas flooding in high-water-cut deep reservoirs.
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页数：9
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共 37 条
  • [1] Andrey A., Anna A., Anna C., Influence of oil field production life on optimal CO2 flooding strategies: Insight from the microscopic displacement efficiency, J. Pet. Sci. Eng., 205, (2021)
  • [2] Araujo L.L.G.C.D., Sodre L.G.P., Brasil L.R., Domingos D.F., Oliveira V.M.D., Cruz G.F.D., Microbial enhanced oil recovery using a biosurfactant produced by Bacillus safensis isolated from mangrove microbiota - Part I biosurfactant characterization and oil displacement test, J. Pet. Sci. Eng., 180, (2019)
  • [3] Chen H., Li H., Li Z., Li S., Wang Y., Wang J., Li B., Effects of matrix permeability and fracture on production characteristics and residual oil distribution during flue gas flooding in low permeability/tight reservoirs, J. Pet. Sci. Eng., 195, (2020)
  • [4] Chen Z., Su Y., Li L., Meng F., Zhou X., Characteristics and mechanisms of supercritical CO2 flooding under different factors in low-permeability reservoirs, Pet. Sci., 19, (2022)
  • [5] Chunming X., Shujun L., Bin D., Xiangfei G., Jun Z., Youguo Y., Molecular insight into the oil displacement mechanism of gas flooding in deep oil reservoir, Chem. Phys. Lett., 783, (2021)
  • [6] Chunming X., Yang S., Fujian Z., Xiongfei L., Xianyou Y., Xiangtong Y., High efficiency reservoir stimulation based on temporary plugging and diverting for deep reservoirs, Pet. Explor. Dev., 45, 5, pp. 948-954, (2018)
  • [7] Das A., Nguyen N., Nguyen Q.P., Low tension gas flooding for secondary oil recovery in low-permeability, high-salinity reservoirs, Fuel, 264, (2020)
  • [8] Farahi M.M.M., Ahmadi M., Dabir B., Model-based water-flooding optimization using multi-objective approach for efficient reservoir management, J. Pet. Sci. Eng., 196, (2021)
  • [9] Gang H., Huabin L., Chengfei G., Jianjun L., Jinpin D., Sisi L., Hua D., Stable foam systems for improving oil recovery under high-temperature and high-salt reservoir conditions, J. Pet. Sci. Eng., 211, (2022)
  • [10] Hawthorne S.B., Miller D.J., A comparison of crude oil hydrocarbon mobilization by vaporization gas drive into methane, ethane, and carbon dioxide at 15.6/MPa and 4R/°C, Fuel., 249, (2019)
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