Enhance Oil Recovery for Steam Flooding: Low-Temperature Oxidative Decomposition of Heavy Oil with Air Injection

蒸汽注入 二次空气喷射 石油工程 燃烧 注水(采油) 提高采收率 环境科学 洪水(心理学) 废物管理 化学 地质学 有机化学 心理学 工程类 心理治疗师
作者
Changjiu Wang,Huiqing Liu,Zhanxi Pang,Jing Wang,Changyong Chen,Chunlei Wang,Zhengbin Wu
出处
期刊:Energy & Fuels [American Chemical Society]
卷期号:29 (10): 6242-6249 被引量:26
标识
DOI:10.1021/acs.energyfuels.5b01330
摘要

With the increasing demand of energy, technical research of how to enhance oil recovery of steam flooding for heavy oil reservoirs has attracted widespread attention at present. Air-injection is an effective technology that has been used to improve the development effect of steam flooding in heavy oil reservoirs. The low-temperature oxidation (LTO) reaction and the high-temperature combustion reaction are the main mechanisms of air-injection technology. The high-temperature combustion reaction can decompose the heavy component in heavy oil, but it requires a higher-temperature condition, which the steam flooding process cannot offer. In addition, the LTO reaction between air and heavy oil consumes the O2, so the safety risk of explosion caused by the mixture of O2 and hydrocarbon gas can be eliminated. Nevertheless, oil viscosity will increase. During the steam flooding process, an aquathermolysis reaction occurs between heavy oil and high-temperature water, which decreases the content of the heavy component in heavy oil. Besides, catalyst MnO2 promotes the reaction by decreasing the activation energy of the reaction. In this paper, several static oxidative decomposition experiments are conducted to study the change characteristics of pressure, gas composition, oil composition, and oil viscosity after the reactions with different temperatures, pressures, and water saturations. In addition, four dynamic displacement experiments are conducted to compare the displacement effect of different displacement methods, including N2-injection displacement, air-injection displacement, steam flooding, and air-injection-assisted steam flooding. Experimental results show that air-injection can effectively improve the development effect of steam flooding in heavy oil reservoirs. Upgrading and viscosity reduction for heavy oil by the combination of the LTO reaction and the aquathermolysis reaction can slow down steam channeling and increase production rate, thereby enhancing the ultimate recovery of steam flooding.
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