What are the detection methods for oil casing pipe?

What are the detection methods of oil casing pipe? Let's take a brief look:

1. Ultrasonic detection

When ultrasonic waves are propagated in the material being tested, the acoustic properties of the material and the changes in the internal structure have a certain impact on the propagation of ultrasonic waves. By detecting the level and situation of the impact of ultrasonic waves, the changes in the function and structure of the material can be understood.

2. Radiographic detection

Radiographic detection uses the difference in the amount of radiation transmitted through the normal part and the defective part to form the discrimination of the blackness on the film.

3. Penetrant testing

Penetrant testing uses the capillary action of liquid to penetrate the open defects on the surface of solid materials, and then absorbs the penetrant liquid to the surface through the developer to show the existence of defects. Penetrant testing is suitable for various metal and ceramic workpieces, and the time from penetration operation to defect display is relatively short, usually about half an hour. It can detect surface fatigue, stress corrosion and welding cracks, and can directly measure the size of cracks.

4. Magnetic particle testing

Magnetic particle testing uses the leakage of magnetic particles at the defects to absorb magnetic particles and form magnetic traces to provide defect display. It can detect surface and sub-surface defects. The nature of the defects is easy to distinguish, and the paint and electroplating surface do not affect the detection accuracy.

5. Eddy current testing

Eddy current testing mainly uses the eddy current induced by the ferromagnetic coil in the workpiece to analyze the quality of the workpiece. It can detect surface and near-surface defects of various conductive materials. The usual parameter control is complicated, the detection results are difficult to explain, and the detection object must be a conductive crack, and the defect length can be measured indirectly.

6. Magnetic flux leakage detection

Magnetic flux leakage detection of oil casing and tubing is based on the high magnetic permeability characteristics of ferromagnetic materials. It detects the quality of in-service oil casing and tubing by measuring the change in magnetic permeability caused by defects in ferromagnetic materials.

7. Magnetic impression detection

Magnetic impression detection is derived from the relationship between the physical nature of the magnetic phenomenon of metals and the dislocation process. It has many advantages such as high utilization rate, low cost, and no need for polishing. It has important and ordinary application prospects in the industry.

Why is oil casing pipe detection so important?

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