Applied Research of Heat Self-Generated CO₂ Technology in Steam Huff and Puff

Abstract:

Heat self-generated CO₂ technique is proposed, which is focused on the problems of recovery difficulty, poor effect steam soaking and so on for heavy oil reservoirs. This technology is combining of steam flooding and gas flooding and so on. Its main mechanism is the application of steam heating blowing agent to generate a large volume of gases (including CO₂, NH₃, etc) in the formation. While some of these gases acting with the oil to reduce the oil viscosity, some form miscible flooding to reduce water interfacial tension, so as to achieve the purpose of enhancing oil recovery. An optimized selection of the heat blowing agents was performed. By comparison the difference before and after the reaction of blowing agent solution, the increase of alkaline is occurred after the reaction, and is helpful to reduce oil viscosity and lower interfacial tension, etc. Studies indicate that heat-generating CO₂ flooding technology can get a maximum viscosity reduction rate of 76.7%, oil-water interfacial tension decreased by 54.77%, further improve oil recovery by 4.17% based on the steam drive, which shows a technical advantage toward conventional EOR method. The field experiments indicate that the technique can greatly improve the oil production, which will provide a powerful technical supporting for the efficient development of heavy oil.

• Periodical: Advanced Materials Research (Volumes 1010-1012)
• Pages: 1693-1698
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1010-1012.1693
• Online since: August 2014
• Authors: Yi Ding*, Guo Wei Qin, Peng Liu, Zi Li Fan, Hong Wei Xiao, Yan Ming Bai, Lei Wang, Wen Bo Xu
• Keywords: EOR, Heat Self-Generated CO₂ Technology, Heavy Oil, Steam Huff and Puff, Viscosity Reduction Rate

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