Numerical Simulation Analysis on the Lateral Dynamic Characteristics of Deepwater Conductor Considering the Pile-Soil Contact Models
Abstract
:1. Introduction
2. Pile–Soil Contact Models
2.1. Contact Surface Model
2.1.1. Normal Contact Model
2.1.2. Tangential Contact Model
2.2. Goodman Contact Element Model
3. Numerical Simulation and Discussion
3.1. Numerical Simulation
3.1.1. Modeling Process
Geometric Model
3.1.2. Simulation Results
3.2. Model Validation and Mesh Independence
3.3. Parameter Sensitivity Analysis
3.3.1. Bending Moment on the Top of the Conductor
3.3.2. Wellhead Stick-Up
3.3.3. Geometry of the Conductor
3.3.4. Mechanical Parameters of the Soil
4. Conclusions
- (1)
- The lateral deformation, deflection angle and von Mises stress calculated by the Goodman contact element model are greater than those calculated by the contact surface model. Therefore, we recommend that the Goodman element model should be paid sufficient attention while analyzing the stability of the subsea wellhead during deepwater drilling.
- (2)
- The maximum lateral deformation and bending moment of the conductor decrease with the O.D. and W.T. of the conductor and the cohesion and internal friction angle of the soil, while they increase with the wellhead stick-up. Both the vertical force on the conductor and the soil density have a negligible effect on the lateral response of the conductor.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
Nomenclature
soil cohesion, MPa | |
damping coefficient of the soil, N/m·s | |
clearance and pressure on the contact surface, m | |
bending stiffness, N·m2 | |
distance between the two contact surfaces, m | |
normal stiffness coefficient of the contact surface, N/m2 | |
tangential stiffness coefficient of the contact surface, N/m2 | |
distance between the two nodes in Goodman element model, m | |
mass of the conductor per length, kg/m | |
axial force of the conductor, N | |
pressure on the contact surface, MPa | |
time, s | |
relative displacement of the contact surface, m | |
conductor depth, m | |
lateral deformation of the conductor, m | |
undetermined constant, dimensionless | |
undetermined constant, dimensionless | |
tangential relative displacement of the contact surface, m | |
normal relative displacement of the contact surface, m | |
normal stress, MPa | |
normal stress on the contact surface, MPa | |
shear strength, MPa | |
relative stress, MPa | |
tangential stress on the contact surface, MPa | |
internal friction angle, ° |
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Parameters | Value | Parameters | Value |
---|---|---|---|
Water depth (m) | 1000 | Elasticity modulus (GPa) | 210 |
Wellhead stick-up (m) | 5 | Density (kg/m3) | 7800 |
Penetration depth (m) | 60 | Weight of BOP (t) | 200 |
O.D. of the conductor (in) | 36 | Poisson’s ratio | 0.3 |
W.T. of the conductor (in) | 1 | Maximum bending moment on the conductor (kN·m) | 3000 |
Type | Depth form Mudline (m) | Elasticity Modulus (MPa) | Poisson’s Ratio | Cohesion (Kpa) | Internal Friction Angle (°) | Density (kg/m3) |
---|---|---|---|---|---|---|
I | 0~5 | 45 | 0.35 | 9 | 30 | 1550 |
II | 5~15 | 250 | 0.31 | 25 | 30 | 1800 |
III | 15~30 | 350 | 0.32 | 15 | 38 | 1950 |
IV | 30~90 | 872 | 0.27 | 40 | 31 | 1050 |
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Wang, Y.; Gao, D.; Meng, C. Numerical Simulation Analysis on the Lateral Dynamic Characteristics of Deepwater Conductor Considering the Pile-Soil Contact Models. J. Mar. Sci. Eng. 2022, 10, 1540. https://doi.org/10.3390/jmse10101540
Wang Y, Gao D, Meng C. Numerical Simulation Analysis on the Lateral Dynamic Characteristics of Deepwater Conductor Considering the Pile-Soil Contact Models. Journal of Marine Science and Engineering. 2022; 10(10):1540. https://doi.org/10.3390/jmse10101540
Chicago/Turabian StyleWang, Yanbin, Deli Gao, and Chenyu Meng. 2022. "Numerical Simulation Analysis on the Lateral Dynamic Characteristics of Deepwater Conductor Considering the Pile-Soil Contact Models" Journal of Marine Science and Engineering 10, no. 10: 1540. https://doi.org/10.3390/jmse10101540