What are the detection methods for oil casing

Petroleum casing is a high-end product produced by steel pipes. There are many varieties of casing, and there are many varieties and requirements for casing pipe end buckle types. The buckle types that can be processed include STC, LC, BC, VAM, and others. The production and installation process of oil casing involves a lot of testing, mainly as follows:

1. Ultrasonic testing; when ultrasonic waves propagate in the material being tested, changes in the acoustic properties and internal structure of the material will have a certain impact on the propagation of ultrasonic waves. By exploring the extent and conditions of the impact of ultrasonic waves, we can understand the performance and structure of the material. changes.
2. Radiographic testing; Radiographic testing uses the different amounts of radiation transmitted through normal and defective parts to form differences in blackness on the film.
3. Penetration testing; Penetration testing uses the capillary effect of liquid to enter the penetrating liquid into the defective opening on the surface of the solid material, and then uses the developer to suck the entering penetrating liquid out to the surface to reveal the presence of defects.
4. Magnetic particle testing: Magnetic particle testing uses magnetic flux leakage at the defect to absorb magnetic particles and form magnetic marks to provide defect display. It can detect surface and sub-surface defects, and the nature of the defect is easy to identify.
5. Eddy current testing; Eddy current testing mainly uses the eddy currents induced by ferromagnetic coils in the workpiece to analyze the internal quality of the workpiece. It can detect surface and near-surface defects of various conductive materials. Generally, parameter control is difficult.
6. Magnetic flux leakage detection; magnetic flux leakage detection of oil casing is based on the characteristics of high magnetic permeability of ferromagnetic materials. It detects the magnetic permeability of in-service oil casings by measuring the magnetic permeability caused by defects in ferromagnetic materials.
7. Magnetic memory detection; Magnetic memory 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 efficiency, low cost, and no need for polishing, and it has important application prospects in the industry.