| Autor: |
Lin H; CCDC Drilling Engineering Technology Research Institute, Xi'an 710018, China.; National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi'an 710018, China., Chen X; CCDC Drilling Engineering Technology Research Institute, Xi'an 710018, China.; National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi'an 710018, China., Luo Z; CCDC Geological Exploration & Development Research Institute, Chengdu 610051, China., Xu J; CCDC Drilling Engineering Technology Research Institute, Xi'an 710018, China.; National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi'an 710018, China., Lu P; CCDC Drilling Engineering Technology Research Institute, Xi'an 710018, China.; National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi'an 710018, China., Xie T; Gas Transmission Management Department, Southwest Oil & GasField Company, Petrochina, Chengdu 610215, China., Tang J; School of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610600, China., Wang H; School of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610600, China. |
| Abstrakt: |
Under-deposit corrosion is widely present in the pipelines of oil and gas production, causing significant corrosion damage. In this paper, a novel electrochemical cathodic-polarization method was carried out to accelerate the formation of CaCO 3 scale on a X65 steel surface in a simulated solution containing scaling ions. Subsequently, pre-scaled X65 steel was placed in a high temperature and pressure autoclave to conduct corrosion weight-loss experiments and in situ electrochemical measurements. The study mainly compared the corrosion inhibition behavior of four quaternary ammonium salt corrosion inhibitors, pyridinium quaternary salt (BPC), quinolinium quaternary salt (BQC), 8-hydroxyquinolinium quaternary salt (BHQ) and pyridinium (1-chloromethyl naphthalene) quaternary salt (1-CPN), in a simulated oilfield scale under corrosive conditions. The results of the weight-loss experiments demonstrated that the inhibition efficiencies of the corrosion inhibitors from high to low were as follows: 1-CPN < BHQ < BQC < BPC. The in situ electrochemical measurements showed that the immersion time and type of corrosion inhibitor had a pronounced influence on the corrosion and corrosion inhibition behavior of X65 steel with CaCO 3 coating. It was also proved using both EIS and PC that 1-CPN shows the best inhibition performance in all. Lastly, the inhibition mechanism of corrosion inhibitors at under-deposit conditions was analyzed via a surface morphology observation of SEM. |
