Drilling Tools Branch of Daqing Oilfield Drilling Technology Co., Ltd. took the lead in completing the research on “Drilling tool thread stress fatigue testing technology†in China, filling the domestic gap.
The application of this technology will realize the quantitative detection of thread fatigue fatigue defects of oil drilling tools, and provide technical guarantee for reducing the occurrence of oil drilling thread breakage accidents.
The fracture of the oil thread joint is the most serious and devastating accident of the drill connection failure. In order to reduce and avoid thread breakage accidents, ultrasonic tools, magnetic powders, etc. are usually used for non-destructive testing of the drill threads, but only existing thread defects can be found.
Through years of drilling practice, the company learned that the main reason for the fracture of the thread is that there is a stress fatigue zone at the threaded joint. When the stress fatigue reaches a certain limit during use, the thread will suddenly break. “Drilling tool thread stress fatigue testing technology†is to evaluate the oil drilling tool thread before it is defective, and find hidden dangers, so as to reduce the oil drill due to stress fatigue and fracture accident.
At the beginning of 2006, Daqing Drilling Technology Co., Ltd. officially started the research of this technology. In the past two years, it has tested more than 500 drill collars (more than 1000 internal and external threads). At the same time of a large number of on-site inspections, the fatigue source detection signal was detected multiple times, the repetition rate was 100%, and the mechanical properties of the drill material were tested.
In order to ensure the reliability of the research, the company also tracked the drilled tools, and as of now, these drills have no quality problems. Through theoretical analysis and field practice, the company summarized and developed a special oil drilling tool thread stress fatigue detection method and testing process, and developed a stress evaluation software. Applying this evaluation software to stress fatigue assessment of oil drilling tool threads, the accuracy rate is over 96%, and the fatigue fracture success rate of drilling tools is also over 96%.
The application of “Drilling Thread Stress Fatigue Detection Technology†has increased the non-destructive testing methods of China's petroleum industry, improved the detection level, and improved the safety and economy of drilling production.
The application of this technology will realize the quantitative detection of thread fatigue fatigue defects of oil drilling tools, and provide technical guarantee for reducing the occurrence of oil drilling thread breakage accidents.
The fracture of the oil thread joint is the most serious and devastating accident of the drill connection failure. In order to reduce and avoid thread breakage accidents, ultrasonic tools, magnetic powders, etc. are usually used for non-destructive testing of the drill threads, but only existing thread defects can be found.
Through years of drilling practice, the company learned that the main reason for the fracture of the thread is that there is a stress fatigue zone at the threaded joint. When the stress fatigue reaches a certain limit during use, the thread will suddenly break. “Drilling tool thread stress fatigue testing technology†is to evaluate the oil drilling tool thread before it is defective, and find hidden dangers, so as to reduce the oil drill due to stress fatigue and fracture accident.
At the beginning of 2006, Daqing Drilling Technology Co., Ltd. officially started the research of this technology. In the past two years, it has tested more than 500 drill collars (more than 1000 internal and external threads). At the same time of a large number of on-site inspections, the fatigue source detection signal was detected multiple times, the repetition rate was 100%, and the mechanical properties of the drill material were tested.
In order to ensure the reliability of the research, the company also tracked the drilled tools, and as of now, these drills have no quality problems. Through theoretical analysis and field practice, the company summarized and developed a special oil drilling tool thread stress fatigue detection method and testing process, and developed a stress evaluation software. Applying this evaluation software to stress fatigue assessment of oil drilling tool threads, the accuracy rate is over 96%, and the fatigue fracture success rate of drilling tools is also over 96%.
The application of “Drilling Thread Stress Fatigue Detection Technology†has increased the non-destructive testing methods of China's petroleum industry, improved the detection level, and improved the safety and economy of drilling production.
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