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Oil casing pipe is a high-end product produced by steel pipe production, there are many types of casing, with a total of 15 categories of specifications, with an outer diameter range of 114.3-508mm; steel grades are divided into 11 types such as J55, K55, N80, L-80, P-110, C-90, C-95, T-95; and there are many types and requirements for the buckle type of casing end, with processing buckles such as STC, LC, BC, VAM. The production and installation of oil casings involve many inspections, mainly the following:
When ultrasonic waves propagate in the detected material, the acoustic characteristics of the steel material and the changes in the internal structure have a certain impact on the propagation of ultrasonic waves. By detecting the degree and condition of the impact of ultrasonic waves, the changes in material performance and structure can be understood.
Radiographic testing uses the difference in the amount of radiation passing through normal and defective locations to cause differences in the blackness on the film.
Penetrant testing uses the capillary action of liquid to penetrate the opening defects on the surface of solid materials, and then uses the imaging agent to draw the penetrated penetrant to the surface 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, generally about half an hour, and it can detect surface fatigue, stress corrosion, and welding cracks, and can directly measure the size of cracks.
Magnetic particle testing uses magnetic flux leakage at the defect site to adsorb magnetic powder and form a magnetic trace to provide defect display. It can detect surface and subsurface defects, the defect properties are easy to identify, and the sensitivity of detection is not affected by paint or electroplating surfaces.
Eddy current testing mainly uses the eddy current generated by the ferromagnetic coil in the workpiece to analyze the quality of the internal quality of the workpiece. It can detect surface and near-surface defects of various conductive materials, but the parameter control is difficult, and the test result is difficult to explain. It also requires that the detection object must be a conductive crack, and the defect length can be indirectly measured.
Magnetic leakage testing of oil casing pipes is based on the high magnetic conductivity characteristics of ferromagnetic materials, and detects the quality of oil casings in service by measuring the change in magnetic conductivity caused by defects in ferromagnetic materials.
Magnetic memory testing is based on the relationship between the physical nature of metal magnetic phenomena and dislocation processes. It has many advantages such as high efficiency, low cost, and no need for polishing, and has important and wide application prospects in the industry.
SAIGAO Group specializes in the design, research and development, processing, manufacturing, sales, and export of mechanical equipment. The leading products include various mud pumps, downhole motors, various screen pipes, cementing tools, and various wellhead equipment. SAIGAO products are not only sold well in China, but also exported to countries and regions such as Russia, Brazil, Australia, and South Africa.
Adhering to the principle of "customer first, quality first", we wholeheartedly provide customers with high-quality products and first-class services. We warmly welcome customers, partners, and friends from all walks of life to visit us!
