WIT Press


Multi-component Friction Testing Of Full-scale Drill Pipe Specimen

Price

Free (open access)

Paper DOI

10.2495/TD120061

Volume

76

Pages

12

Page Range

65 - 76

Published

2012

Size

1,886 kb

Author(s)

V. Tikhonov, M. Giers, V. Yakhimovich, B. Shemyakinsky & L. Ring

Abstract

The paper presents the results of testing conducted to determine hoop and axial friction components for drill pipe specimens subjected to complex rotation inside a piece of casing. This experiment was performed in water using the SPbSPUā€™s wear bench which was modified specifically to permit independent rotation of drill pipe section and casing, as well as drill pipe axial sliding. Hoop and axial friction force components were determined during these tests as a function of relative velocity of contact point in complex rotation. The test results were used to establish empirical dependence of these friction force components on axial and relative hoop velocities at transition from sliding to rolling friction. The obtained results have allowed formulations of more precise friction model, which is crucial for the torque and drag analysis of a drillstring inside the wellbore. Keywords: drillstring, complex rotation and sliding, axial and hoop friction forces, testing, empirical model.

Keywords

drillstring, complex rotation and sliding, axial and hoop friction forces, testing, empirical model