eprintid: 246
rev_number: 13
eprint_status: archive
userid: 7
dir: disk0/00/00/02/46
datestamp: 2009-10-20 10:23:59
lastmod: 2015-05-29 19:51:31
status_changed: 2009-10-20 10:23:59
type: report
metadata_visibility: show
item_issues_count: 0
creators_name: Jones, Marvin
creators_name: Barton, David
creators_name: Hall, Cameron
creators_name: Coskun, Erhan
creators_name: Lacey, Andrew
creators_name: Lorenz, Maike
creators_name: Maringer, Johannes
creators_name: Please, Colin
creators_name: Richardson, Giles
corp_creators: Wajid Rasheed
title: Underreamer mechanics
ispublished: pub
subjects: utilities
studygroups: esgi68
companyname: SmartReamer Ltd
full_text_status: public
abstract: 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.
date: 2009
related_url_url: http://www.smithinst.ac.uk/Projects/ESGI68/ESGI68-SmartReamer/Report
citation:   Jones, Marvin and Barton, David and Hall, Cameron and Coskun, Erhan and Lacey, Andrew and Lorenz, Maike and Maringer, Johannes and Please, Colin and Richardson, Giles  (2009) Underreamer mechanics.  [Study Group Report]     
document_url: http://miis.maths.ox.ac.uk/miis/246/1/SmartReamer-Underreamer.pdf