Qian Cheng, Wang Yefei, Yang Zhen, Qu Zhengtian, Ding Mingchen, Chen Wuhua, He Zhenpei
Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education Qingdao Shandong 266580 P. R. China
Shandong Key Laboratory of Oilfield Chemistry, School of Petroleum Engineering, China University of Petroleum (East China) Qingdao Shandong 266580 P. R. China.
RSC Adv. 2019 Dec 2;9(68):39914-39923. doi: 10.1039/c9ra07934c.
The N generation technique is a promising method for enhancing oil recovery (EOR) and blockage removal. Conventionally, N is generated through the redox reactions of sodium nitrite (NaNO) and ammonium chloride (NHCl). The effect of several parameters on N production was studied in this work. The reaction kinetics between NaNO and NHCl were developed. The results revealed that the optimal molar ratio was 1 : 1 for the reactants and a higher concentration of reactants, H and higher temperature would lead to an increase in the gas production volume and a better gas-generating efficiency. The kinetic equation of the N generation reaction was defined as d/d = -7.103 × 10 e . Methyl formate, ethyl formate, ammonium persulphate as well as paraformaldehyde were selected as authigenic acids by measuring their pH values and their effect on the rate of gas-generation, and the gas production volume was studied. An energy enhancement experiment was conducted to examine the influence of reactant concentration, initial pressure and different authigenic acids on energy enhancement and gas-generating efficiency. The results showed that the increase in reactant concentration can improve the energy enhancement while neither the reactant concentration nor the initial pressure could hardly influence the gas-generating efficiency. The presence of authigenic acids can considerably enhance both the gas production volume and the gas-generating efficiency of the system. The ammonium persulphate assisted N generation system is considered to be suitable for field applications.
N 代技术是一种很有前景的提高采收率（EOR）和解除堵塞的方法。传统上，N 通过亚硝酸钠（NaNO）和氯化铵（NHCl）的氧化还原反应生成。本工作研究了几个参数对 N 生成的影响。推导了 NaNO 和 NHCl 之间的反应动力学。结果表明，反应物的最佳摩尔比为 1∶1，反应物浓度越高、H 越高以及温度越高，产气体积增加且产气效率更高。N 生成反应的动力学方程定义为 d/d = -7.103 × 10 e 。通过测量甲酸甲酯、甲酸乙酯、过硫酸铵以及多聚甲醛的 pH 值及其对产气速率的影响，选择它们作为自生酸，并研究了产气情况。进行了能量增强实验，以考察反应物浓度、初始压力和不同自生酸对能量增强和产气效率的影响。结果表明，反应物浓度的增加可提高能量增强，而反应物浓度和初始压力几乎都不会影响产气效率。自生酸的存在可显著提高系统的产气体积和产气效率。过硫酸铵辅助 N 生成系统被认为适用于现场应用。
