DEA Project Number: DEA-117
Project Title: Coiled Tubing Mechanical Performance
Contractor: Coiled Tubing Engineering Services 9870 Pozos Lane Conroe, Texas 77303
Email: knewman@ctes.com
World Wide Web Site: www.ctes.com
Startup Date: Started October 1, 1998
Scope of Work: This project will attempt to answer the following
questions: (1) Do the mechanical limits of the CT remain constant throughout its life, or
should they be degraded as the fatigue life increases? (2) Do the residual stresses
in the CT affect the CT limits? (3) Are the Von Mises limits used by the industry
today correct for CT which has been bent? (4) Does the tension while bending (from
reel back tension, heave loads, spooled riser) affect the fatigue life and deformation
(elongation and diameter changes)? (5) How does the rotation of the CT during its
life affect the fatigue life and deformation? Over 200 fatigue and limit tests will
be performed by CTES to answer these questions. Professor Steve Tipton will
analyze the test results and prepare computer models to predict the CT limits, fatigue
life and deformation.
Current Status: Testing of CT samples is in progress. Results to
date show that rotation and axial load have a tremendous impact on the deformation and
fatigue life.
Project Completion Date: June 1999
Project Cost: $250,000
Participants: GRI, Shell, Mobil, Arco, Quality Tubing, Precision Tubing,
Fleet Coil Technologies