What other tests are needed for finished drill pipes to leave the warehouse?

Classification:

Industry dynamics

Release time:

2021-06-09

【Summary Description】 The drill pipe is a thin-walled pipe, which is subjected to axial force, bending moment, centrifugal force, torsional force and dynamic load during the drilling process, and the premise of the working condition is extremely harsh.

钻杆

a rootdrill pipeThe production of the drill pipe requires a lot of process steps. After the drill pipe is made into a finished product, further testing is required, which is the magnetic flux leakage testing method described below:The drill pipe is a thin-walled pipe, which is subjected to axial force, bending moment, centrifugal force, torsional force and dynamic load during the drilling process, and the premise of the working condition is extremely harsh. Especially in deep wells and inclined wells, small defects in drill pipes may lead to downhole drilling tool accidents. With the continuous development of drilling technology, in order to improve the penetration rate, the use of downhole power drilling tools has increased, the drill string speed has improved, and the requirements for the quality of drill pipe have become higher and higher.

Current Situation of 1. Drill Pipe Flaw Detection Technology and Characteristics of Magnetic Flux Leakage Detection Technology

At present, the ultrasonic and magnetic particle inspection commonly used in oil fields can only detect the thread of drill pipe, but not the pipe body. The pipe body inspection depends on the inspection staff to observe whether there is puncture and severe trauma on the outer wall of the pipe body.(Slot, weld scar, erosion pit, etc.). Wall thickness detection is the use of single-point thickness gauge,At each end of the heel joint1.5mThe circumferential direction of the three parts in the middle of the pipe body and the pipe body shall be taken altogether.12A point thickness measurement. The above detection method can not meet the requirements of the drill pipe body flaw detection, and it is easy to produce missed detection.

Magnetic flux leakage testing technology is a newly developed non-destructive testing technology in recent years. The principle is the same as that of magnetic particle testing. It can not only conduct a comprehensive testing of drill pipe, but also obtain intuitive quantitative testing results by using electronic technology. It detects correctly, fast, especially suitable for large quantities of drill pipe detection work.

The working principle of the 2. magnetic flux leakage detection technology device and the factors affecting the detection accuracy

The magnetic flux leakage flaw detector system can complete the internal and external transverse defect detection, pipe wall thickness detection and steel grade comparison and identification. The system adopts the working mode of probe fixing and drill pipe advancing, and uses the high-energy magnetic field generated by the fixed magnetization coil in front of the probedrill pipeMagnetized to saturation or near saturation.

IfIf there is a defect or wall thickness loss of the drill pipe, the magnetic field leakage will occur, and the probe can detect the magnetic field change through the period and pass throughA/DConverted to digital signals, processed by the computer into intuitive graphics.

Key words:

weilida drill