Industrial, Mechanical and Manufacturing Science – Zheng (Ed.)
© 2015 Taylor & Francis Group, London, ISBN: 978-1-138-02656-8
Research on the erosion of valve of positive pulse measurement
while drilling and structural improvement
Changqing Zhao, Kai Liu & Xing Chai
Faculty of Mechanical and Precision Instrument Engineering, Xi’an University of Technology, Xi’an, Shaanxi, China
ABSTRACT: Valve assembly of rotary valve type Positive Pulse Mmeasurement While Drilling (PPMWD)
is often used to generate pressure wave signal in logging while drilling. The sudden change of fluid direction
and pressure at the valve assembly always causes erosion-corrosion, resulting in punching and breaking. To
improve anti-erosion capacity and reduce the failure probability ...