Oil casing is an advanced product produced from steel pipes. There are many kinds of casing, with a total of 15 specifications in diameter, and the outer diameter range is 114.3-508 mm. There are 11 types of steel grades such as j55, k55, n80, l-80, p-110, c-90, c-95, t-95, etc. There are many types and requirements for casing coupling thread, including stc, lc, bc , Vam and other threads. The production and installation of oil casing involves a large number of tests, and several of them will be introduced below.

1. Ultrasonic testing

When the ultrasonic wave propagates in the measured 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. Ultrasonic detection is to detect the degree and condition of the ultrasonic wave to understand the change of the material performance and structure.

2. Radiographic testing

Petroleum Casing says that X-ray inspection uses different amounts of radiation to pass through normal parts and defects, resulting in differences in blackness on the film.

3. Magnetic particle testing

Magnetic particle detection is to use magnetic leakage defects and magnetic powder adsorption to form magnetic marks to provide defect display, which can detect surface and underground defects. The defect characteristics are easy to identify. Paint and electroplated surfaces do not affect detection sensitivity.

4. Penetration testing

The penetration test uses the capillary action of the liquid to penetrate the permeate into the open defect on the surface of the solid material, and then the penetrant is sucked out to the surface by the developer to show the existence of the defect.