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Prediction and Mitigation of Drillstring Vibration
An oil well drillstring is a slender slru(.;ture whidl vibrales in 3 major coupleu moues. Unwnlrolkd
vibration of the drillstring interferes with the drilling procedure. Tool and bit failure, improper
borehole quality and lower penetration rates are examples of the side effects of unwanted vibration of
the drillstring. Prior research by others has attempted to model the drillstring under different effects
and interactions. However, due to the nonlinear characteristics of the combined vibration modes, and
interacting loads such as bit-formation interaction and contact with the wellbore, it is not feasible to
analytically solve the system equations and investigate the vibration trends for models with a large number of realistic downhole conditions. Numerical modeling is an effective way to overcome the
complex problem of coupled equations of motion of the drillstring in the presence of contact with the
wellbore. Several factors such as drillcollar and drillpipe length, material and cross sections affect the
vibration behavior….TOBECONTINUED
Faculty Supervisor:
G. Rideout
Student:
Partner:
Suncor Energy Inc (St. John's, NL)
Discipline:
Engineering
Sector:
Mining; Professional, scientific and technical services
University:
Memorial University of Newfoundland
Program:
Accelerate
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