Zhanfeng Chen

TL;DR: Based on the spatial curved beam element, a new finite element model for drillstring dynamics was presented to understand the dynamic characteristics of the drillstring in a curved borehole as discussed by the authors, which can be used to improve the efficiency of dynamic analysis of drillstring with ultra-slenderness ratio in the ultra-deep well.

TL;DR: The number of papers submitted to the JPVT has increased significantly this year as mentioned in this paper by the end of this third quarter, the total number of submitted papers exceeded the average number for the past years.

TL;DR: Based on the double circular arc (DCA) model and elastic-plastic theory, an analytical solution of the corroded pipelines under internal and external pressures was obtained. And then, a new burst pressure equation of the pipelines with high strength was further provided according to the von Mises criterion and previous equations.

TL;DR: The experimental results show that the compensator based on the Prandtl-Ishlinskii (PI) model can effectively suppress the hysteresis of the piezoelectric actuator.

TL;DR: In this article, two analytical models were proposed to predict the burst pressure of pipes characterized by a small thickness-to-diameter ratio and geometric eccentricity, based on a complex stress function in a bipolar coordinate system.