Abstract
In the view of fluid-structure interactions and rotor dynamics, this paper models the lateral vibration of a vertical downward rotating elastic drill string conveying mud subjected to supporting stabilizers, bit torque and longitudinal thrust. The dynamic model involves the rotational inertia of the drill string tube cross section, the gyroscopic effect caused by rotation, the damping due to friction with the surrounding fluid, the gravity force and mud buoyancy. Damped natural frequency, stability and resonance of the drill string system are determined by quadratic eigenvalue problem and investigated at influences of the stabilizer, rotational angular speed, mud flowing velocity, bit torque and thrust. As a result, the drill string can lose stability both at simultaneous and separate influences of the mud conveying, bit torque and thrust, whereas the rotation, stabilizer and gravity of the drill string can improve system stability; the rotational angular speed causing system resonance decreases with the increase of the mud flowing velocity, bit torque and thrust.
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Abbreviations
- A m :
-
tube bore area of the drill string
- A t :
-
area of the tube wall cross section
- c :
-
visco-elastic damping coefficient
- \(c_{j}^{\mathrm{s}}\) :
-
damping coefficient
- E :
-
Young’s modulus of the drill string material
- g, G :
-
acceleration of gravity
- I m :
-
area moment of inertia of the tube bore
- I t :
-
area moment of inertia of the tube wall cross section
- j :
-
the j-th stabilizer
- J :
-
stabilizer number
- \(k_{j}^{\mathrm{s}}\) :
-
stiffness coefficient
- L :
-
total length of the drill string
- p m :
-
mud pressure in the tube
- P :
-
longitudinal thrust on bit
- r i, r o :
-
inner and outer diameter of the drill string tube
- t :
-
time
- T :
-
torque on bit
- v :
-
dimensionless mud flowing velocity
- v c :
-
dimensionless critical mud flowing velocity
- V :
-
mud flowing velocity in the tube
- w, w u , w v :
-
elastic displacement
- x :
-
longitudinal coordinate
- \(x_{j}^{\mathrm{s}}\) :
-
stabilizer location
- γ :
-
dimensionless thrust on bit
- γ c :
-
dimensionless critical bit longitudinal thrust
- ε :
-
dimensionless torque on bit
- ε c :
-
dimensionless critical bit torque
- ζ :
-
dimensionless rotating angular speed
- ζ r :
-
resonant rotational angular speed
- η :
-
coefficient of internal dissipation
- η k :
-
dimensionless coefficient of internal dissipation
- η m :
-
dimensionless visco-elastic damping coefficient
- \(\eta ^{\mathrm{s}} _{j},\ \eta _{\mathrm{s}}\) :
-
dimensionless damping coefficient
- \(\kappa ^{\mathrm{s}} _{j},\ \kappa _{\mathrm{s}}\) :
-
dimensionless stiffness coefficient
- λ :
-
eigenvalue
- ρ m :
-
mud density
- ρ t :
-
density of the drill string material
- τ :
-
dimensionless time
- ω 0 :
-
first damped natural frequency of load-free drill string system
- Ω :
-
drill string rotating angular speed
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Acknowledgements
This work was supported by the Chinese Government’s Executive Program for Exploring the Deep Interior Beneath the Chinese Continent—Instrumentation Development for Deep Continental Scientific Drilling (Sinoprobe-09-05).
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Pei, YC., Sun, YH. & Wang, JX. Dynamics of rotating conveying mud drill string subjected to torque and longitudinal thrust. Meccanica 48, 2189–2201 (2013). https://doi.org/10.1007/s11012-013-9733-8
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DOI: https://doi.org/10.1007/s11012-013-9733-8