Oil casing production and installation process involves a lot of testing, mainly in the following:
1, Ultrasonic testing
When the ultrasonic wave propagates in the tested material, the acoustic characteristics of the material and the change of the internal structure have a certain influence on the propagation of the ultrasonic wave, and the change of the material performance and structure is realized by detecting the degree and condition of the ultrasonic wave.
2, Ray detection
Ray detection is the use of normal parts and defects through the amount of radiation is different, resulting in the difference between the blackness of the film.
3, Penetration testing
Penetration test is the use of liquid capillary action, the infiltration of liquid into the surface of the solid material surface defects, and then through the imaging agent will penetrate the permeate into the surface to show the presence of defects.Penetration testing is suitable for a variety of metal and ceramic workpieces, and from the infiltration operation to the defect display time is relatively short, generally about half an hour, can detect surface fatigue, stress corrosion and welding cracks, can directly measure the size of the crack.
4. Magnetic particle testing
Magnetic particle testing is the use of magnetic flux leakage and the adsorption of magnetic powder, the formation of magnetic marks, to provide defect display, can detect surface and sub-surface defects, easy to identify the nature of defects, paint and plating surface does not affect the detection sensitivity.
5, Eddy current testing
Eddy current testing is mainly used in the workpiece in the eddy current, to analyze the internal quality of the workpiece, can detect a variety of conductive material surface and near surface defects, usually difficult to control parameters, test results difficult to explain, and requires the detection of objects Must be conductive cracks, and can indirectly measure the defect length.
6, Magnetic flux leakage detection
The magnetic flux leakage detection of oil casing is based on the high magnetic permeability of ferromagnetic materials, and the quality of active oil casing is detected by measuring the change of permeability caused by defects in ferromagnetic materials.
7, Magnetic memory detection
Magnetic memory detection is derived from the physical phenomena of metal magnetic phenomena and the relationship between the dislocation process, with high efficiency, low cost, no need to polish and many other advantages in the industry has important and wide application prospects.
