Corrosion Behavior and Protection Measures of Water Injection Pipe in Kazakhstan K Oilfield

The corrosion mechanisms of N80,1Cr and 3Cr in the simulated water injection wells of Kazakhstan K oilfield were studied by weight-loss method, SEM, EDS, XPS and electrochemical testing. Material selection was carried out according to the corrosion resistance and economic benefits of different materials. The results show that 3Cr steel had the best corrosion resistance while N80 steel was the worst among three materials. The corrosion products on 1Cr and 3 Cr steels promoted their corrosion resistance compared to N80 steel. The combination of N80 steel and corrosion inhibitor D composed of mannich base and scale inhibitor had the best corrosion resistance among all inhibitors in simulated environment. For anti-corrosion technology, there was a greater economic benefit by replacing carbon steel with low alloy steel, which could meet the requirements of flied demands.