Numerical simulation of mechanical compaction of deepwater shallow sediments

Sun, Jie; Wu, Shiguo; Deng, Jingen; Lin, Haifei; Zhang, Hanyu; Wang, Jiliang; Gao, Junfeng

doi:10.1007/s11802-018-3461-6

Cited by 5 publications

(3 citation statements)

References 19 publications

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“…Zhang Jing [6] and others proposed a regression formula for the total resistance of oil tankers under different trim. Tong Jun [7] and others investigated the resistance of PLG ships under different draught, speed and trim based on CFD method and model test. From the above research, it can be seen that most of the design of the optimal trim ship form uses CFD technology to calculate different trim, and then selects a ship form with the minimum resistance, without using optimization technology to automatically select.…”

Section: Introductionmentioning

confidence: 99%

Research on trim and energy efficiency optimization of ship in actual navigation

Zhang

2023

Third International Conference on Mechanical Design and Simulation (MDS 2023)

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In order to achieve energy conservation in actual navigation, based on the Rankine source method of potential flow theory, NSGA-II algorithm is used to study the design of energy-saving ship form in regular waves in this paper. Taking the geometric shapes at the bow and stern waterline of the KCS ship as the optimized design field, the FFD method is used to realize the parametric modeling and geometric reconstruction of the hull. The optimal trim and minimum EEDI are adopted as the objective function. Under the constraint condition of displacement, the NSGA-II algorithm is used to optimize the ship form with the optimal performance. The optimization results show that the wave-making resistance of the optimized ship form is reduced by 39.67% during the optimal trim, which verifies the feasibility of the research method proposed in this paper.

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Section: Introductionmentioning

confidence: 99%

Research on trim and energy efficiency optimization of ship in actual navigation

Zhang

2023

Third International Conference on Mechanical Design and Simulation (MDS 2023)

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“…In their shallow water flow model, both water and sand flows strictly follow Darcy's law and petroleum reservoir simulation practices were widely implemented. Based on the commercial simulator FLAC3D which couples fluid flow and geomechanics, Sun et al [25] simulated the fluid flow behaviors which obey Darcy's law and the rock deformation which is based on Cam-Clay material assumptions. Zhang et al [5] introduced a prediction model, which includes a hybrid computational approach.…”

Section: Introductionmentioning

confidence: 99%

“…According to the literature review, numerical modeling is effective in the characterization of shallow water flows. Specifically, Darcy's law, the equation describing subsurface flow in porous media, was proved to be useful and has been successfully used in the quantification of shallow water flows in the porous media buried beneath the mud line [5,[23][24][25]. Meanwhile, it is noted that not many studies were carried out to investigate the coupled behaviors of subsurface fluid flow and rock deformation in the context of deepwaterdrilling-induced shallow water flows.…”

Section: Introductionmentioning

confidence: 99%

A Parametric Study of Coupled Hydromechanical Behaviors Induced by Shallow Water Flow in Shallow Sediments in Deepwater Drilling Based on Numerical Modeling

2020

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Shallow water flow is a geohazard encountered in deepwater drilling. It is often characterized by excessive water flow into the wellbore caused by the pressure difference between overpressured sediments and the wellbore, and it usually leads to serious well control problems and may eventually result in the loss of a well. Many research efforts focused on the identification of shallow water flow zones and the associated water flow in the drilled wellbore. Not many studies investigated the coupled hydromechanical behaviors in sediments during the occurrence of shallow water flow, while such behaviors are directly related to uncontrolled flow in the wellbore and solid deformation. Based on a coupled hydraulic-mechanical model and finite element methods, this work investigates the temporal-spatial evolutions of near-well pressure and stress induced by shallow water flow. Hydraulic behaviors in the deepwater shallow sediments are described by saturated fluid flow in porous media while mechanical behaviors in the sediments are depicted by linear elasticity. Finite element methods are used for the numerical solution to the coupled hydraulic-mechanical formulation. The study then conducts a series of parametric studies to quantitatively understand the effects of relevant parameters on pressure, stress, and uncontrolled flow into the wellbore. Results indicate that overpressure has the most significant impact while Young’s modulus has the most limited impact on spatial-temporal pressure/stress evolutions and the uncontrolled water production in the wellbore. Permeability, porosity, water viscosity, and water compressibility all have certain effects on near-well physical characteristics and wellbore water production. In addition, it is noted that pressure drainage and induced stress are more significant when it is closer to the wellbore. This numerical study helps to quantitatively identify the most influential parameters related to shallow water flow and calculates the water mass flow loaded in the wellbore.

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Deep-sea geohazards in the South China Sea

Wang

Völker

2018

J. Ocean Univ. China

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Numerical simulation of mechanical compaction of deepwater shallow sediments

Cited by 5 publications

References 19 publications

Research on trim and energy efficiency optimization of ship in actual navigation

Research on trim and energy efficiency optimization of ship in actual navigation

A Parametric Study of Coupled Hydromechanical Behaviors Induced by Shallow Water Flow in Shallow Sediments in Deepwater Drilling Based on Numerical Modeling

Deep-sea geohazards in the South China Sea

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