scholarly journals Simulation and Experiment on Phase Equilibrium of Gas Hydrate Using the T-Type Pipe Confluence Model

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Bo Kang ◽  
Honghai Fan ◽  
Panglu Jiang ◽  
Yu Ye ◽  
Xiangji Kong ◽  
...  
Keyword(s):  
Gas Hydrate ◽  
Coupling Model ◽  
Type Model ◽  
Well Completion ◽  
Confluence Model ◽  
Contrast Analysis ◽  
Simulation And Experiment ◽  
Fluent Software ◽  
Temperature And Pressure ◽  
Velocity Changes

A constraint of the development of gas hydrate is the phase change that may cause engineering losses in the mining process, which tends to be clogged in the section of well completion (sieve section: wellbore lifting section). The flow of gas hydrate in the well completion section was simplified using the T-type pipe confluence model in this paper. The temperature and pressure coupling model in the confluence section was derived first, followed by the use of the Fluent software to simulate its gradient changes in the T-type model. Then, the physical model and the experiment were designed to study the velocity changes. Finally, the contrast analysis between experiment and numerical simulation was carried out. Through the study of this paper, it is possible to prevent blockage in the well completion section during the process of depressurization, which can provide theoretical guidance for the control of pressure drop when gas hydrate is produced.

Study on the Phase Equilibrium of Gas Hydrate Based on Main-Branch Pipe Confluence Model

2019 ◽  
Author(s):  
Song Deng ◽  
Yali Liu ◽  
Xia Wei ◽  
Lei Tao ◽  
Yanfeng He
Keyword(s):  
Phase Equilibrium ◽  
Gas Hydrate ◽  
Branch Pipe ◽  
Confluence Model

Thermal analysis method of electromagnetic linear actuator based on multiphysics coupling model

2021 ◽  
pp. 1-17
Author(s):  
Geng Wang ◽  
Renjing Gao ◽  
Qi Wang ◽  
Shutian Liu
Keyword(s):  
Thermal Analysis ◽  
Thermal Characteristics ◽  
Coupling Model ◽  
Analysis Method ◽  
Thermal Analysis Method ◽  
Performance Requirements ◽  
Wide Range ◽  
Multiphysics Coupling ◽  
Simulation And Experiment ◽  
Electromagnetic Linear Actuator

Electromagnetic linear actuators (ELAs) may be confronted with unsatisfactory performance when subjected to overheating. Therefore, it is significant to clarify its thermal characteristics and design the thermal performance requirements. A thermal analysis method based on multiphysics coupling model was presented, which uses the non-simplified loss distribution as the heat source to calculate the temperature field, adjusts the material properties by temperature, and considers the interaction between motion (including impact) and loss. More importantly, an improved universal equivalent winding to satisfy the condition of real compact concentrated winding was developed. Finally, the validity of this approach was verified through the experiment, and the regularity of temperature was summarized. The results show that the error of simulation and experiment is less than 6% and the permissible continuous operation frequency is no more than 30 Hz. The approach proposed in this paper can be employed not only to the ELA, but also to the design and analysis a wide range of electromagnetic machines.

Measured temperature and pressure dependence of Vp and Vs in compacted, polycrystalline sI methane and sII methane–ethane hydrate

2003 ◽  
Vol 81 (1-2) ◽  
pp. 47-53 ◽  
Author(s):  
M B Helgerud ◽  
W F Waite ◽  
S H Kirby ◽  
A Nur
Keyword(s):  
High Pressure ◽  
Shear Wave ◽  
Pressure Dependence ◽  
Gas Hydrate ◽  
Pressure Vessel ◽  
Wave Speed ◽  
Measured Temperature ◽  
Shear Wave Speed ◽  
Temperature And Pressure ◽  
Fixed End

We report on compressional- and shear-wave-speed measurements made on compacted polycrystalline sI methane and sII methane–ethane hydrate. The gas hydrate samples are synthesized directly in the measurement apparatus by warming granulated ice to 17°C in the presence of a clathrate-forming gas at high pressure (methane for sI, 90.2% methane, 9.8% ethane for sII). Porosity is eliminated after hydrate synthesis by compacting the sample in the synthesis pressure vessel between a hydraulic ram and a fixed end-plug, both containing shear-wave transducers. Wave-speed measurements are made between –20 and 15°C and 0 to 105 MPa applied piston pressure. PACS No.: 61.60Lj

Multiphysics Coupling Model for Computing Pier Scour upon Simulation and Experiment

2018 ◽  
Vol 32 (1) ◽  
pp. 04017068 ◽  
Author(s):  
Yao-Ming Hong ◽  
Yao-Chiang Kan ◽  
Jian-Rong Zeng ◽  
Hsueh-Chun Lin
Keyword(s):  
Coupling Model ◽  
Pier Scour ◽  
Multiphysics Coupling ◽  
Simulation And Experiment

Transition Segments Processing Method Based on Curve Fitting Algorithm

2013 ◽  
Vol 819 ◽  
pp. 398-403
Author(s):  
Yue Zhang ◽  
Qing Jian Liu ◽  
Lu Liu ◽  
Tai Yong Wang
Keyword(s):  
Curve Fitting ◽  
High Accuracy ◽  
Processing Method ◽  
Processing Efficiency ◽  
Time Curve ◽  
Transition Velocity ◽  
Fitting Algorithm ◽  
Simulation And Experiment ◽  
Transition Points ◽  
Velocity Changes

In order to obtain better speed and high accuracy, real-time curve fitting and fitting processing at transition points are often necessary when machining complex contours. Based on the quadratic trigonometric Bézier curve, a new algorithm is presented to realize curve fitting only between transition segments. This method ensures the machining precision and increases the maximum allowable speed at the transition points. Simulation and experiment results show that the transition velocity changes smoothly and steadily as well as the processing efficiency is promoted.

scholarly journals Investigation and application of wellbore temperature and pressure field coupling with gas–liquid two-phase flowing

2021 ◽  
Author(s):  
Jie Zheng ◽  
Yihua Dou ◽  
Zhenzhen Li ◽  
Xin Yan ◽  
Yarong Zhang ◽  
...  
Keyword(s):  
Single Phase ◽  
Phase State ◽  
Pressure Field ◽  
Coupling Model ◽  
High Water ◽  
Two Phase ◽  
Gas Well ◽  
Single Phase State ◽  
Wellbore Temperature ◽  
Temperature And Pressure

AbstractWith the development of gas well exploitation, the calculation of wellbore with single-phase state affected by single factor cannot meet the actual needs of engineering. We need to consider the simulation calculation of complex wellbore environment under the coupling of multiphase and multiple factors, so as to better serve the petroleum industry. In view of the problem that the commonly used temperature and pressure model can only be used for single-phase state under complex well conditions, and the error is large. Combined with the wellbore heat transfer mechanism and the calculation method of pipe flow pressure drop gradient, this study analyzes the shortcomings of Ramey model and Hassan & Kabir model through transient analysis. Based on the equations of mass conservation, momentum conservation and energy conservation, and considering the interaction between fluid physical parameters and temperature and pressure, the wellbore pressure coupling model of water-bearing gas well is established, and the Newton Raphael iterative method is used for MATLAB programming. On this basis, the relationship between tubing diameter, gas production, gas–water ratio, and wellbore temperature field and pressure field in high water-bearing gas wells is discussed. The results show that the wellbore temperature pressure coupling model of high water-bearing gas well considering the coupling of gas–liquid two-phase flow wellbore temperature pressure field has higher accuracy than Ramey model and Hassan & Kabir model, and the minimum coefficients of variation of each model are 0.022, 0.037 and 0.042, respectively. Therefore, the model in this study is highly consistent with the field measured data. Therefore, the findings of this study are helpful to better calculate the wellbore temperature and pressure parameters under complex well conditions.

The response of temperature and pressure of hydrate reservoirs in the first gas hydrate production test in South China Sea

2020 ◽  
Vol 278 ◽  
pp. 115649 ◽  
Author(s):  
Xuwen Qin ◽  
Qianyong Liang ◽  
Jianliang Ye ◽  
Lin Yang ◽  
Haijun Qiu ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Gas Hydrate ◽  
Production Test ◽  
China Sea ◽  
Temperature And Pressure ◽  
Hydrate Reservoirs

The Simulation of the Launching Process on Concentration Water Injection Launcher

2013 ◽  
Vol 419 ◽  
pp. 186-191
Author(s):  
Xiao Fei Zhou ◽  
Yi Jiang ◽  
Yu Sen Niu ◽  
Shao Zhen Yu
Keyword(s):  
Flow Field ◽  
Water Injection ◽  
Calculation Model ◽  
Two Phase ◽  
Average Temperature ◽  
Fluent Software ◽  
Simulation Results ◽  
Temperature And Pressure ◽  
Gas Liquid Flow ◽  
New Research

Simulation of the launching process in concentration water injection launcher, and get the parameter variations during the launch process, compared with traditional engineering algorithm, verify the reliability of the simulation results, given a new research method of interior ballistics on this launch system. This simulation has very important meaning for the temperature and pressure checking at the Beginning of the design. The simulation results show that,after the flow field stable,the average temperature and pressure in low-pressure chamber and the sabot are very close. This article uses the FLUENT software, use Mixture two-phase flow calculation model to solve the gas-liquid flow field, use the dynamic mesh and UDF program to simulation the flow field.

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