Long Li
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
Long Li has a total of 7 co-authors. Here are the top co-authors by number of shared publications:
- Chaoqing Tang
School of Artificial Intelligence and Automation, Huazhong University of Science and Technology, Wuhan, China
1 shared publication - Hui Fang
School of Manufacturing Science and Engineering, Sichuan University, Chengdu 610065, China
1 shared publication - Jianbo Wu
School of Mechanical Engineering, Sichuan University, Chengdu, Sichuan, China
1 shared publication - Jie Wang
School of Mechanical Engineering, Sichuan University, Chengdu, China
1 shared publication - Xiaoming Huang
School of Manufacturing Science and Engineering, Sichuan University, Chengdu 610065, China
1 shared publication - Yanhua Sun
Huazhong University of Science and Technology
1 shared publication
Latest Publications
- Open Access
A Lift-Off-Tolerant Magnetic Flux Leakage Testing Method for Drill Pipes at Wellhead
To meet the great needs for MFL (magnetic flux leakage) inspection of drill pipes at wellheads, a lift-off-tolerant MFL testing method is proposed and investigated in this paper. Firstly, a Helmholtz coil magnetization method and the whole MFL testing scheme are proposed. Then, based on the magnetic field focusing effect of ferrite cores, a lift-off-tolerant MFL sensor is developed and tested. It shows high sensitivity at a lift-off distance of 5.0 mm. Further, the follow-up high repeatability MFL probing system is designed and manufactured, which was embedded with the developed sensors. It can track the swing movement of drill pipes and allow the pipe ends to pass smoothly. Finally, the developed system is employed in a drilling field for drill pipe inspection. Test results show that the proposed method can fulfill the requirements for drill pipe inspection at wellheads, which is of great importance in drill pipe safety.
Open AccessA Lift-Off-Tolerant Magnetic Flux Leakage Testing Method for Drill Pipes at Wellhead
To meet the great needs for MFL (magnetic flux leakage) inspection of drill pipes at wellheads, a lift-off-tolerant MFL testing method is proposed and investigated in this paper. Firstly, a Helmholtz coil magnetization method and the whole MFL testing scheme are proposed. Then, based on the magnetic field focusing effect of ferrite cores, a lift-off-tolerant MFL sensor is developed and tested. It shows high sensitivity at a lift-off distance of 5.0 mm. Further, the follow-up high repeatability MFL probing system is designed and manufactured, which was embedded with the developed sensors. It can track the swing movement of drill pipes and allow the pipe ends to pass smoothly. Finally, the developed system is employed in a drilling field for drill pipe inspection. Test results show that the proposed method can fulfill the requirements for drill pipe inspection at wellheads, which is of great importance in drill pipe safety.