Abstract: In oil mining system, stress cracks on thread usually lead to drill pipe failure. To maintain normal operation of drill pipes, the thread needs to be nondestructively tested. However, due to ...

Abstract: This During the oilfield development process, a large number of oil casing pipes are used, and the geometric accuracy of their threaded connections is crucial for their sealing performance ...

The world's most visited museum has revealed that French police have dismantled what they called a "large-scale" ticket fraud network. Two museum employees have been arrested in conjunction with the ...