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Oil casing is a high-end product manufactured from steel pipes. There is a wide variety of oil casing, and the types and requirements of pipe end couplings are numerous. Coupling types that can be processed for oil casing include STC, LC, BC, and VAM. The production and installation process of oil casing involves many inspections, mainly the following:
1. Ultrasonic testing of oil casing: When ultrasound propagates in the tested material, the acoustic characteristics of the material and changes in its internal structure have a certain impact on the transmission of ultrasound. By examining the degree and condition of the impact on ultrasound, the changes in material properties and structure can be understood.
2. Radiographic testing of oil casing: Radiographic testing utilizes the difference in the amount of radiation transmitted between normal areas and defects in the oil casing, resulting in differences in the density of the film.
3. Impregnation testing of oil casing: Impregnation testing uses the capillary effect of a liquid. Impregnating liquid is introduced into the surface of the solid material at an opening defect, and then a developer is used to draw the impregnating liquid back to the surface, revealing the presence of the oilfield casing defect.
4. Magnetic Particle Inspection of Oil Casing: Magnetic particle inspection utilizes the magnetic flux leakage at defects in the oil casing, which attracts magnetic particles, forming magnetic traces to reveal the defects. It can detect surface and subsurface defects in oil casing, and the nature of the defects is easily identified.
5. Eddy Current Inspection of Oil Casing: Eddy current inspection primarily uses eddy currents induced in the workpiece by ferromagnetic coils to analyze the internal quality of the workpiece. It can detect surface and near-surface defects in various conductive materials, although parameter control is often difficult.
6. Magnetic Flux Leakage Inspection of Oil Casing: Magnetic flux leakage inspection of oil casing is based on the high permeability of ferromagnetic materials. It measures the permeability caused by defects in the ferromagnetic material to assess the quality of in-service oil casing.
7. Magnetic Memory Detection of Oil Casing: Magnetic memory detection of oil casing originates from the relationship between the physical nature of magnetic phenomena in metals and dislocation processes. Oil casing has many advantages, such as high efficiency, low cost, and no need for grinding, making it a promising area for industrial applications.
