Reaction characteristics of sodium nitrite and ammonium chloride system
Wang Yefei1,2,3, Qian Cheng1,2,3, Ji Zongjiang4, Yan Fei5, Yang Zhen1,2,3, Ding Mingchen1,2,3, Chen Wuhua1,2,3
1. Key Laboratory of Unconventional Oil & Gas Development of Ministry of Education, China University of Petroleum, Shandong Qingdao 266580, China;
2. Shandong Key Laboratory of Oilfield Chemistry, School of Petroleum Engineering, China University of Petroleum, Shandong Qingdao 266580, China;
3. School of Petroleum Engineering, China University of Petroleum, Shandong Qingdao 266580, China;
4. No.2 Oil Production Plant, PetroChina Xinjiang Oilfield Company, Xinjiang Karamay 834000, China;
5. Drilling and Production Technology Research Institute, PetroChina Jidong Oilfield Company, Hebei Tangshan 063000, China
On the basis of in-situ nitrogen generation system of sodium nitrite and ammonium chloride commonly used in oil fields, the effects of various factors on gas production performance were investigated by atmospheric pressure/high pressure gas production experiments. The results show that when the molar concentration ratio of reactants is 1:1, the higher the reactant concentration, hydrogen ion concentration and temperature, the higher the reaction rate and gas production. The initial pressure of the reaction has little effect on gas production of the system. The heat generation capacity of the in-situ nitrogen reaction increases with an increase in the concentration of reactants, the concentration of hydrogen ions, and the initial reaction temperature, and the peak temperature of the reaction system is also increased. The reaction kinetic equation of NaNO2/NH4Cl system is dc/dt=-7.103×107c(H+)1.329 1c02.094 9e(-51.28/RT). There are two intermediate products during the mixing reaction of NaNO2 and NH4Cl, i.e, H2N-NO and HN=NOH. The reaction rate is determined by the reaction forming H2N-NO by NH3 and N2O3 through the nucleophilic substitution process of SN2. The HN=NOH obtained by H2N-NO conversion can be spontaneously decomposed, producing the final products N2 and H2O.
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2020, Vol. 41 
