Abstract:

Shale oil in-situ mining technology has many advantages and can effectively improve mining efficiency. However, the operating conditions for shale oil in-situ mining are harsh, and the pipes used in these conditions will experience severe high-temperature corrosion over a long period. Hence, the material selection is key to a safe and effective in-situ shale oil exploitation. In this study, common oil well pipe materials J55, P110, and 3Cr were selected as research objects. Microstructural characterization, cross-sectional observation, and oxidation kinetics curve were used to study their high-temperature corrosion resistance performance at 600 ℃. The research results show that with the increase of corrosion time, the thickness of the oxide film on the surface of the three samples increases, the J55 has the thickest oxide film, and the 3Cr has the thinnest. Secondly, the oxidation weight gain of the three samples increases with the extension of corrosion time, the J55 has the highest oxidation weight gain, and the 3Cr has the lowest. Finally, the surface products of the three samples all contain Fe₂O₃, and the surface of 3Cr also has chromium oxide. The above results indicate that the 3Cr has the best high-temperature corrosion resistance performance among the three materials. In the high-temperature underground environment of shale oil in-situ mining, the chromium content is an important reference for material selection.

Key words: oil shale')">

oil shale, high temperature corrosion, in-situ mining；J55；P110；3Cr