In-situ oxidation of crude oils for enhanced recovery by alkaline flooding |
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| Affiliation: | 1. Key Laboratory of Material Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450052, China;2. Key Laboratory of Opto-Electronics Information Technology (Tianjin University), Ministry of Education, School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China;1. Ecology Department, College of Resources and Environment, Hunan Provincial Key Laboratory of Rural Ecosystem Health in Dongting Lake Area, Hunan Agricultural University, Changsha, 410128, China;2. School of Forestry and Bio-technology, Zhejiang Agriculture & Forestry University, Hangzhou, 311300, China |
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| Abstract: | Crude oils with acid numbers too low to warrant alkaline flooding for enhanced oil recovery were subjected to in-situ air oxidation in unconsolidated cores at temperatures corresponding to reservoir conditions. The oxidation process resulted in a significant increase in the acid number of the crudes studied. Acid numbers were found to increase with temperature, air flow rate, pressure, and reaction time and were found to be affected by the core and crude composition. The range of conditions studied include temperatures of 75–125 °C, pressures of 0.34–3.10 MPa [50–450 psig], reaction times of 24–504 h and core flow rates of 0–1.41 m h−1 (0–111 ft day−1). Oxidized crudes were found to have much lower caustic/crude interfacial tensions than the parent crude. Flooding experiments in unconsolidated cores showed an improved recovery efficiency for an oxidized crude over its parent crude. |
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