Volume 38 Issue 3
Sep.  2021
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MENG Xuangang, WU Wen, PENG Fen, YANG Zhanwei, WANG Liao, GAO Ying, WANG Liwei. Analysis and Countermeasures of Corrosion Cracking of an Oil Pipe[J]. DRILLING FLUID & COMPLETION FLUID, 2021, 38(3): 380-384. doi: 10.3969/j.issn.1001-5620.2021.03.021
Citation: MENG Xuangang, WU Wen, PENG Fen, YANG Zhanwei, WANG Liao, GAO Ying, WANG Liwei. Analysis and Countermeasures of Corrosion Cracking of an Oil Pipe[J]. DRILLING FLUID & COMPLETION FLUID, 2021, 38(3): 380-384. doi: 10.3969/j.issn.1001-5620.2021.03.021

Analysis and Countermeasures of Corrosion Cracking of an Oil Pipe

doi: 10.3969/j.issn.1001-5620.2021.03.021
  • Received Date: 2021-01-30
  • Existing acid corrosion inhibitors are ineffective to eliminate the stress corrosion of acidic high-concentration brines on super 13Cr material oil pipes under high temperature environments. In actual production applications, stress corrosion cracking is caused, and new corrosion inhibitors need to be developed to solve high temperature acids and high temperatures. Stress corrosion of acidic high concentration brine. Based on the research on the corrosion inhibition mechanism of existing corrosion inhibitors, the shortcomings are analyzed, and the corrosion inhibition mechanism of polymerized film formation is proposed, that is, some compounds are used to react with each other under certain conditions in an acid environment to produce a solution containing at least 2 An intermediate product of an active functional group can quickly form a polymer film on the metal surface. Based on this theory, a new type of corrosion inhibitor was developed, which was tested by a high-temperature and high-pressure dynamic corrosion rate measuring instrument. At 180℃, the minimum corrosion rate of 15% hydrochloric acid was 16.0 g/m2·h; four-point bending test confirmed that the corrosion inhibitor was significantly eliminated The stress corrosion cracking of the super 13Cr material test piece produced by acidic high-concentration brine in a high-temperature environment. The new corrosion inhibitor can effectively reduce the stress corrosion cracking of super 13Cr material tubing in ultra-deep high temperature and high pressure gas wells.

     

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