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A single-electrode amperometric detection method for the inner coating of downhole oil casing

A detection method and inner coating technology, applied in casing, measurement, drill pipe, etc., can solve the problems of qualitative detection and quantitative detection of coating damage rate or damage level, etc., and achieve short logging time, optimized design, Logging Fast Effects

Active Publication Date: 2018-01-05
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to solve the problem that the existing technology cannot determine the damage rate or damage level of the inner coating of the downhole oil casing through qualitative detection and quantitative detection

Method used

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  • A single-electrode amperometric detection method for the inner coating of downhole oil casing
  • A single-electrode amperometric detection method for the inner coating of downhole oil casing
  • A single-electrode amperometric detection method for the inner coating of downhole oil casing

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The invention provides a single-electrode current type detection method for the inner coating of downhole oil casing, which comprises the following steps:

[0038] Step 1: Prepare the downhole instrument string, the downhole instrument string includes a logging cable 110, one end of the logging cable 110 is electrically connected with a magnetic locator 102, a positive electrode 103, a bridle 105, and a logging cable 110 in sequence from bottom to top The bottom end of the centralizer is connected to the centralizer 100, the other end of the logging cable 110 is electrically connected to a constant voltage source 112, the constant voltage source 112 is electrically connected to the dynamic logging system 111, and the dynamic logging system 111 is electrically connected to the logging cable 110. The constant voltage source 112 is electrically connected to the ground electrode 113;

[0039] Step 2: Make the oil casing 107 with damaged inner coating, fill the oil casing 10...

Embodiment 2

[0061]On the basis of Embodiment 1, a weighting rod 101 is connected between the centralizer 100 and the magnetic locator 102, and the centralizer 100 and the weighting rod 101 play a role of centralizing the downhole instrument. A conductivity electrode 104 for detecting the conductivity of the electrolyte is provided between the positive electrode 103 and the bridle 105 described in step one. The speed of lifting the logging cable 110 upward at a constant speed described in step 2 and step 7 is less than 1000m / hr. The dynamic logging system 111 adopts SKD3000 numerical control logging surface system.

[0062] It should be noted that the positive electrode can also be replaced by the positive pole of the power supply and the negative pole of the power supply. Specifically, the positive pole of the power supply is connected between the magnetic positioner and the bridle, and the negative pole of the power supply is connected between the positive pole of the power supply and th...

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Abstract

The invention belongs to the field of anti-corrosion coating detection, and provides a single-electrode current detection method for the inner coating of downhole oil casing. A positive electrode and an auxiliary supporting instrument string are inserted into the oil casing, and a constant voltage is applied to the positive electrode. The instrument string collects the current of the loop composed of the positive electrode, electrolyte, coating damage and grounding electrode during the lifting process from the bottom of the well. The current reflects the quality of the inner coating of the oil casing. The single-electrode current detection method for the inner coating of the downhole oil and casing provided by the present invention can realize the inner coating of the downhole oil and casing by processing and interpreting the collected data when there are conductive media such as oil and water in the oil-water well. Accurate qualitative and quantitative judgments can be made on layers, with good accuracy, fast logging, convenient and safe operation, and low detection cost.

Description

technical field [0001] The invention belongs to the technical field of anti-corrosion coating detection, and in particular relates to a single-electrode current detection method for the inner coating of downhole oil and casing pipes. Background technique [0002] For the carbon steel (conforming to API 5CT material) oil casing (abbreviation of oil pipe and casing) of highly corrosive oil wells, the internal coating protection technology of organic coating can effectively prolong the life of the casing, and has been adopted by many domestic and foreign oilfields on a large scale. The annual application of inner-coated oil casing is more than 1 million meters. There are many logging technologies for internal corrosion, damage and leakage of oil and casing, and a series of relatively mature logging methods have been formed and widely used in the industry, mainly including downhole electromagnetic thickness measurement, dobby hole diameter and well temperature , optical televis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/00
CPCE21B47/092E21B47/007E21B17/1078G01N27/041G01N27/205
Inventor 李琼玮程碧海唐泽玮薛建强付彩利杨会丽何治武杨立华张鑫柱孙雨来
Owner PETROCHINA CO LTD