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Edition and Publication:
< Natural Gas and Oil > Editorial Department
Hosted by:
China Petroleum Engineering & Construction Corporation Southwest Company
Authorized by:
China Petroleum Engineering & Construction Corporation
Co-hosted by:
Overseas Research Center of Research Institute of Petroleum Exploration and Development
Editor in Chief:
Du Tonglin
Vice Editor in Chief:
Tang Xiaoyong,Pu Liming
Address:
No.6, Shenghua Road, High-tech District, Chengdu, Sichuan, China
Postal Code:
610041
Tel:
028-86014709
028-86014500
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cnpc-ngo@cnpc.com.cn
Issue:ISSN 1006-5539
CN 51-1183/TE

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Effect of Preparation Methodology of Double Metal Composite Coatings on Corrosion Resistance

Author of the article:Xi Yuntao, Liu Wei, Liu Rui, Hu Dongwei, Zhang Jiankui

Author's Workplace：1.Oil & Gas Technology Research Institute, Changqing Oilfield Company;2.National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields;3.The Tenth Oil Production Plant, Changqing Oilfield Company;4.The Fifth Oil Production Plant, Changqing Oilfield Company

Key Words：Double metal; Composite coatings; Preparation technology; Corrosion

Abstract：High H₂S and C0₂ content of ancient main production layer in a block of Changqing Oilfield result in serious corrosion and perforation in production strings of some gas wells producing water and frequent workover accordingly, which affects normal production of the gas wells seriously. In order to resolve these problems, studied is corrosion control technology by using double metal composite coatings and composite structures with such 3 layers are formed on the surface of production strings as basement of 1 Cr 13 stainless steel, surface course of Al alloy and sealing agent. Adopted is the orthogonal experiment design method to investigate the effect of coating process parameters on the microstructure, density and corrosion resistance of the composite coatings. Adopted is the scanning electron microscopy (SEM) to characterize microstructure of the composite coatings, used is the Archimedes method to test the density of the coatings and applied is the CORTEST high temperature and high pressure autoclave to estimate corrosion resistance of the coatings and the obtained results show that the density and porosity of the coatings are significantly affected by the arc current and spray distance. The coating density shows a monotonically increasing trend along with arc current increase, the coating density shows a first increasing and then decreasing trend along with spray distance increase and arc voltage has not significant effect on the coating density. Double metal composite coatings prepared in such operating conditions as arc current of 240A, arc voltage of 32V and spray distance of 150mm has a dense microstructure and only 0.072mm/a corrosion rate and its corrosion resistance can be improved by 7 times more than the N80 base.