4/4/2025, 7:30:48 PM 星期五
Analysis of aluminum alloy drill pipe corrosion based on COMSOL
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1.Institute of Exploration Techniques, CAGS, Langfang Hebei 065000, China;2.Deep Geological Drilling Technology Research Center, China Geological Survey, Langfang Hebei 065000, China;3.School of Engineering and Technology, China University of Geosciences, Beijing 100083, China;4.School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China

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P634

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    Abstract:

    In order to predict the corrosion resistance of aluminum alloy drill pipes (ADP) in scientific ultra-deep drilling, COMSOL software was used to establish a multi physical field corrosion analysis model for simulation and analysis of the corrosion law of ADP used in SK-2 well under the action of “stress temperature electrochemistry”. The results show that when the corrosion system reaches equilibrium, the electrolyte potential on one side of the aluminum alloy electrode is higher than the steel joint electrode, and the current density of the aluminum rod near the steel joint electrode is higher. With the increase of stress and temperature, the corrosion rate of ADP is accelerated. Compared with temperature, the influence of stress on corrosion is smaller. It is a positive linear relationship between the corrosion rate and the working time. The closer to the galvanic corrosion site, the higher the interface current density of ADP, exhibiting an exponential relationship. The intensive influence area in the outer wall is about 0~200mm away from galvanic corrosion and that in the inner wall 0~110mm away from. The research results can provide reference for the anti-corrosion of aluminum alloy drill pipes.

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History
  • Received:February 14,2021
  • Revised:March 18,2021
  • Adopted:March 20,2021
  • Online: April 10,2021
  • Published: April 10,2021
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