Method and device for detecting damage rate of an inner coating of a downhole oil casing
First Claim
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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Abstract
This disclosure provides a method and device for detecting the damage rate of an inner coating of a downhole oil casing. The method includes filling the oil casing with electrolyte, obtaining the well depth-detection current on a 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 determining a well depth-damage rate state of the inner coating of the oil casing according to the well depth-detection current. This application can realize quantitative judgment for the damage rate of an inner coating of a downhole oil casing, resulting in rapid in detection speed, convenient and safe in operation, and low detection cost.
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Citations
13 Claims
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1. A method for detecting the damage rate of an inner coating of a downhole oil casing, the method comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A device for detecting the damage rate of an inner coating of a downhole oil casing comprising:
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a constant voltage source; a ground electrode connected with the constant voltage source; a magnetic locator and a discharge electrode connected with the constant voltage source through a logging cable; electrolyte injected into the oil casing; and a dynamic logging system connected with the magnetic locator and the discharge electrode via the logging cable for controlling the movement of the logging cable, so as to drive the magnetic positioner and the discharge electrode to move from one end of the oil casing to the other end of the oil casing, obtaining a well depth of the discharge electrode from the magnetic positioner and a loop current from the logging cable, and obtaining the well depth-detection current data base on the loop current and the well depth. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification