Volume 37 Issue 3
Jun.  2020
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2020  >  37(3): 398-404
MA Lei, YUE Xiaoqi, ZHAO Mifeng, ZHANG Huijuan, XING Xing, WANG Hua, ZHANG Lei, LU Minxu. The Corrosion Behavior of Tubing and Casing Steels in Formate-Phosphate Compound Completion Fluid[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(3): 398-404. doi: 10.3969/j.issn.1001-5620.2020.03.023
Citation: MA Lei, YUE Xiaoqi, ZHAO Mifeng, ZHANG Huijuan, XING Xing, WANG Hua, ZHANG Lei, LU Minxu. The Corrosion Behavior of Tubing and Casing Steels in Formate-Phosphate Compound Completion Fluid[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(3): 398-404. doi: 10.3969/j.issn.1001-5620.2020.03.023
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The Corrosion Behavior of Tubing and Casing Steels in Formate-Phosphate Compound Completion Fluid

doi: 10.3969/j.issn.1001-5620.2020.03.023

  • 1. Petrochina Tarim Oilfield Company, Shihua RD, Korla, Xinjiang 841000;

  • 2. Institute for Advanced Material and Technology, Material Science and Technology Beijing, Beijing 100083

  • Received Date: 2020-02-23
  • Publish Date: 2020-06-28
    Abstract
  • The corrosion behavior of the 13Cr super-martensitic stainless steel (tubing steel) and P110 carbon steel (casing steel) in completion fluid formulated with potassium formate and potassium pyrophosphate in different volumetric ratios was studied with high temperature high pressure simulated soaking test method. It was found in the test that corrosion of the 13Cr super-martensitic stainless steel in the compound completion fluid comes from the inclusion of S element in the steel; enrichment of S in the product film of the steel is the major factor for the deterioration of its corrosion resistance. For the P110 carbon steel, the corrosion product at high temperatures is thick and loose. An increase in the ratio of formate in the compound completion fluid can mitigate the deposition of corrosion product on the surface of the P110 steel, thereby enhancing the tightness of the product film and improving the high temperature corrosion resistance of the steel.

     

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