Analysis for flow and heat transfer of thermal recovery well with steam and multiple thermal fluids injection

作者：Han Bing Bing; Cheng Wen Long^*; Nian Yong Le; Wang Chang Long; Yang Lei

来源：Journal of Engineering Thermophysics, 2016, 37(9): 1867-1874.

• Flow and heat transfer
• Heavy oil exploitations
• Injection temperature
• Multiple-thermal uid
• Pressure and temperature
• Reservoir temperatures
• Temperature differences
• Wellbore

For solving the problems of offshore heavy oil exploitation, researchers developed the multiple thermal uid thermal recovery technology. Compared with steam, multiple thermal uids can significantly reduce the viscosity of heavy oil and increase the reservoir pressure, improve the mining efficiency. Based on real gas state equation and mixed rules, the model for ow and heat transfer of multiple thermal uids is established to compare with ow and heat transfer of steam injected in wellbore, detailed conditions of two kinds of thermal medium in wellbore are analyzed. The results show: compared with steam under the same injection temperature and rate injected in wellbore, pressure and temperature of the multiple thermal uid wellbore drop faster. Bottom hole pressure is larger and temperature is lower when it reaches wellbore bottom, and the temperature difference between formation and reservoir is smaller, heat loss is less, but heat is lower, oil heating range is smaller. To achieve the same heating effiect with steam, it need increase injection rate and injection temperature of the multiple thermal uids. At the same time, due to the effiect of CO2and N2, reservoir temperature distribution is more uniform, and more heat is injected into reservoir, so heat range of oil is bigger, the multiple thermal uid extraction effiect is better.

• 出版日期2016
• 单位中国科学技术大学