Affiliations: [a] State Key Laboratory of Oil and Gas Reservoir Geology
and Exploitation, Southwest Petroleum University, Chengdu, Sichuan, China | [b] College of Mechatronic Engineering, Southwest
Petroleum University, Chengdu, Sichuan, China
Correspondence:
[*]
Corresponding author: Xiaohua Zhu, State Key Laboratory of Oil
& Gas Reservoir Geology and Exploitation, Southwest Petroleum University,
Chengdu 610500, Sichuan, China. Tel.: +86 28 8303 7226; E-mail: [email protected]
Abstract: To mitigate the severe drillstring vibration during oil and gas
drilling, this paper presents a design of mixed mode magnetorheological (MR)
fluid damper based on the electromagnetic finite element analysis and Bingham
plastic model. The 2D axisymmetric finite element model has been established,
and a structural optimization method on the base of magnetic circuit design has
also been put forward. The effects of structural parameters such as the radius
of bobbin, the thickness of cylinder and the active bobbin length on the flux
density inside the fluid gap have been analyzed, which consequently obtain the
appropriate design with a higher and more even magnetic intensity. Besides,
this analysis has found the relations between damping force, amplifying factor
and vibration velocity under different field currents by a typical Bingham
plastic model and test data when considering the negative effects of
temperature on MR fluid, finally, made prediction on the performance of the MR
fluid damper. The main research of the paper lays an important foundation to
develop control strategy of the MR fluid damper for drillstring.
Keywords: Drillstring vibration, magnetorheological fluid damper, magnetic circuits, finite element analysis, optimal design, temperature
