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Method and device for detecting damage rate of an inner coating of a downhole oil casing

  • US 10,641,723 B2
  • Filed: 03/21/2018
  • Issued: 05/05/2020
  • Est. Priority Date: 09/25/2015
  • Status: Active Grant
First Claim
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1. A method for detecting the damage rate of an inner coating of a downhole oil casing, the method comprising:

  • filling an oil casing with electrolyte;

    detecting a loop current of a discharge electrode and a well depth of the discharge electrode in a process of moving the discharge electrode from one end of the oil casing to the other end of the oil casing, and obtaining a well depth-detection current data based on the loop current and the well depth;

    obtaining a function relationship of a known damage rate-experimental current by experimental method; and

    determining a well depth-damage rate state of the inner coating of the oil casing according to the well depth-detection current data and the function relationship of the known damage rate-experimental current.

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