Nondestructive testing of oil drill pipe
Oil drill pipe
Oil drill pipes are indispensable tools in oil extraction work, and they are subjected to complex working conditions such as high temperature and high pressure, strong drilling and rotational forces. Therefore, the quality and safety of oil drill pipes are directly related to the stability and safety of extraction work. Casing pipe, tubing and drill string components (drill pipe, drill collar, square drill pipe, etc.) are collectively referred to as Oil Country Tubular Goods Pipe(OCTG pipe).
The necessity of nondestructive testing of oil drill pipes
In order to ensure the quality and safety of oil drill pipes, nondestructive testing is required. The traditional method of oil drill pipe inspection is mainly to observe whether the surface of the drill pipe is damaged or deformed by visual inspection. This method has the risk of missed detection and misjudgment, and cannot detect defects inside the rod body.
Therefore, the use of nondestructive testing methods to detect oil drill pipes can avoid unnecessary losses and risks. Nondestructive testing methods will not cause damage to oil drill pipes, and can effectively detect internal defects and bending problems.
Nondestructive testing methods for oil drill pipes
1. Ultrasonic testing method
Ultrasonic testing method is a common nondestructive testing method for oil drill pipes. This method sprays an ultrasonic probe on the rod body and uses electronic instruments to detect the ultrasonic signal that bounces back to evaluate whether the rod body has defects. This method can detect cracks, deformations and other problems inside the drill pipe.
2. Magnetic particle testing
Magnetic particle testing is another common non-destructive testing method for oil drill pipes. This method is divided into two types: wet magnetic powder method and dry magnetic powder method. The specific operation is to apply powdered magnetic powder on the surface of the drill pipe and use the magnetic field to detect cracks, deformations and other defects inside the rod body. This method can detect cracks, crack clusters, hydrides and other problems inside the drill pipe.
3.X-ray flaw detection
X-ray flaw detection uses the difference in the degree of X-ray absorption due to different material thicknesses. Through X-ray flaw detection and industrial television real-time imaging, the internal defects of materials, parts and welds are displayed from film and imaging. Such as cracks, shrinkage cavities, pores, slag inclusions, unfused, incomplete penetration, etc., determine the location and size. The quality of materials or products is evaluated by observing the nature, size and location of the defects, thereby preventing major accidents caused by internal defects of materials and poor processing. X-ray technology is used to detect whether there are cracks, looseness and other problems inside the drill pipe.
Common drill pipe inspection standards at home and abroad
1. Domestic standards: Common drill pipe inspection standards in my country's petroleum industry include "Specifications for Electromagnetic Nondestructive Testing of Petroleum Drilling Tools" and "Specifications for Maintenance and Inspection of Petroleum Drilling Equipment".
2. International standards: Internationally, commonly used drill pipe inspection standards include API SPEC 7-1, API SPEC 7, API RP7G, API RP54, etc.
It should be noted that different industries, equipment, and uses may have different requirements for drill pipe inspection standards. Therefore, when selecting drill pipe inspection standards, they should be weighed and selected according to actual conditions.
Conclusion