Fracture Failure Analysis of 127mmG105 Drill Pipe

Fang Po Li; Shu Mao Zhang; Yong Gang Liu; Xin Xu

doi:10.4028/www.scientific.net/AMM.184-185.248

Paper Titles

Finite Element Analysis of ZY18000/32/70D Hydraulic Support Double Telescopic Mast
p.231

Finite Element Modal Analysis of Frame of Vertical Type High-Pressure Grouting Machine Based on ANSYS
p.235

Flexibility of Flapping Rotor Wing and its Effect on Aerodynamic Characteristic
p.239

Flow Field Analysis and Numerical Simulation for Dynamic Filtration with Rotating Disks
p.244

Fracture Failure Analysis of 127mmG105 Drill Pipe
p.248

Grab Bucket Optimization Design Based on the Kinematics and Dynamics Analysis
p.252

Identification and Modeling of Vibration Signals in Startup Stage of Electric Driven Reciprocating Pump
p.256

Influence of Humidity on Burning Perfectibility of Winding Combustible Cartridge Case
p.263

Influence of the Surface Tension of Edible Ink to Piezoelectric Ink-Jet Printing Drop State
p.267

HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 184-185Fracture Failure Analysis of 127mmG105 Drill Pipe

Fracture Failure Analysis of 127mmG105 Drill Pipe

Abstract:

The failure cause of one Φ127mm G105 drill pipe was investigated through mechanical properties testing, optical morphologies and fracture analysis. The results show that drill pipe’s failure reason is the "martensite" white bright layer in its out-surface caused by intense friction in drilling process. Under the effect of torque and tensile loads, lots of cracks initiated in the white bright layer and developed along the vertical. In the end, when its tensile capacity was less than the weight of drilling string, drill pipe fractured along the horizontal. In addition, H2S in the travelling environment promoted crack’s initiation and development.