Improved Thermal Model for Hydrate Formation Drilling Considering Multiple Hydrate Decomposition Effects

2020 ◽  
Author(s):  
Youqiang Liao ◽  
Xiaohui Sun ◽  
Zhiyuan Wang ◽  
Baojiang Sun
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Multiphase Flow ◽  
Thermal Model ◽  
Hydrate Formation ◽  
Wellbore Stability ◽  
Drilling Process ◽  
Hydrate Layer ◽  
Hydrate Decomposition ◽  
Gas Hydrate Formation

Abstract Hydrate is ice-like solid non-stoichiometric crystalline compound, which is stable at favorable low temperature and high-pressure conditions. The predominant gas component stored in naturally-occurring hydrate bearing sediment is CH4 and is estimated about 3000–20000 trillion cubic meter worldwide. Thus, it has attracted significant research interests as an energy source from both academic and industry for the past two decades. Ensuring drilling safety is much important to realize efficient exploitation of hydrate source. Additionally, accurate prediction of wellbore temperature field is of great significance to the design of drilling fluid and cement slurry and the analysis of wellbore stability. However, the heat transfer process in wellbore and hydrate layer during drilling through hydrate formation is a complex phenomenon. The calculation method used in the conventional formation cannot be fully applied to hydrate reservoir drilling, largely due to the complex interactions between the hydrate decomposition, multiphase flow and heat transfer behaviors. In this study, an improved thermal model of wellbore for hydrate layer drilling process is presented by coupling the dynamic decomposition of hydrate, the transportation of hydrate particles in cuttings and heat transfer behaviors in multiphase flow. The distribution of temperature field and rules of hydrate decomposition both in wellbore and hydrate layers are thoroughly analyzed with case study, which is very helpful for the designing drilling parameters, avoiding the gas kick accidents. As well as making a detailed guidance of wellbore stability analysis. This proposed mathematical model is a more in-depth extension of the conventional temperature field prediction model of wellbore, it can present some important implications for drilling through gas–hydrate formation for practical projects.

Coupled Heat and Mass Transfer CFD Model for Methane Hydrate

2015 ◽  
Author(s):  
Eugenio Turco Neto ◽  
M. A. Rahman ◽  
Syed Imtiaz ◽  
Thiago dos Santos Pereira ◽  
Fernanda Soares de Sousa
Keyword(s):  
Natural Gas ◽  
Multiphase Flow ◽  
Gas Hydrate ◽  
Gas Flow ◽  
Three Dimensional ◽  
Hydrate Formation ◽  
Cfd Model ◽  
Flow Metering ◽  
Ansys Cfx ◽  
Gas Hydrate Formation

The gas hydrates problem has been growing in offshore deep water condition where due to low temperature and high pressure hydrate formation becomes more favorable. Several studies have been done to predict the influence of gas hydrate formation in natural gas flow pipeline. However, the effects of multiphase hydrodynamic properties on hydrate formation are missing in these studies. The use of CFD to simulate gas hydrate formation can overcome this gap. In this study a computational fluid dynamics (CFD) model has been developed for mass, heat and momentum transfer for better understanding natural gas hydrate formation and its migration into the pipelines using ANSYS CFX-14. The problem considered in this study is a three-dimensional multiphase-flow model based on Simon Lo (2003) study, which considered the oil-dominant flow in a pipeline with hydrate formation around water droplets dispersed into the oil phase. The results obtained in this study will be useful in designing a multiphase flow metering and a pump to overcome the pressure drop caused by hydrate formation in multiphase petroleum production.

A Model of Multiphase Flow Dynamics Considering the Hydrated Bubble Behaviors and Its Application to Deepwater Kick Simulation

2018 ◽  
Vol 140 (8) ◽  
Author(s):  
Xiaohui Sun ◽  
Baojiang Sun ◽  
Yonghai Gao ◽  
Zhiyuan Wang
Keyword(s):  
Heat Transfer ◽  
Multiphase Flow ◽  
Void Fraction ◽  
Mass Transfer Rate ◽  
Hydrate Formation ◽  
Flow Dynamics ◽  
Fluid Temperature ◽  
Hydrate Shell ◽  
Free Gas ◽  
Mass And Heat Transfer

The interaction between hydrated bubble growth and multiphase flow dynamics is important in deepwater wellbore/pipeline flow. In this study, we derived a hydrate shell growth model considering the intrinsic kinetics, mass and heat transfer, and hydrodynamics mechanisms in which a partly coverage assumption is introduced for elucidating the synergy of bubble hydrodynamics and hydrate morphology. Moreover, a hydro-thermo-hydrate model is developed considering the intercoupling effects including interphase mass and heat transfer, and the slippage of hydrate-coated bubble. Through comparison with experimental data, the performance of proposed model is validated and evaluated. The model is applied to analyze the wellbore dynamics process of kick evolution during deepwater drilling. The simulation results show that the hydrate formation region is mainly near the seafloor affected by the fluid temperature and pressure distributions along the wellbore. The volume change and the mass transfer rate of a hydrated bubble vary complicatedly, because of hydrate formation, hydrate decomposition, and bubble dissolution (both gas and hydrate). Moreover, hydrate phase transition can significantly alter the void fraction and migration velocity of free gas in two aspects: (1) when gas enters the hydrate stability field (HSF), a solid hydrate shell will form on the gas bubble surface, and thereby, the velocity and void fraction of free gas can be considerably decreased; (2) the free gas will separate from solid hydrate and expand rapidly near the sea surface (outside the HSF), which can lead to an abrupt hydrostatic pressure loss and explosive development of the gas kick.

Mathematical modelling of injection gas hydrate formation into the massif of snow saturated the same gas

2016 ◽  
Vol 11 (2) ◽  
pp. 233-239 ◽  
Author(s):  
V.Sh. Shagapov ◽  
A.S. Chiglintseva ◽  
S.V. Belova
Keyword(s):  
Diffusion Coefficient ◽  
Mathematical Modelling ◽  
Gas Hydrate ◽  
Hydrate Formation ◽  
Influence Analysis ◽  
Hydrate Layer ◽  
Gas Hydrate Formation ◽  
Hydrate Saturation ◽  
The Given ◽  
Cold Gas

Considered the problem of gas hydrate formation during injection of cold gas in the snow massif, initially saturated with the same gas. In work some limited scheme according to which, intensity of hydrate formation is limited by diffusion of gas through the hydrate layer formed between the phases of gas and ice, to the boundary of contact ice-hydrate, and is determined by the introduction of only one parameter the given diffusion coefficient. Shows the distributions of pressure, temperature, hydrate saturation and the saturation of the snow at different points in time. Held influence analysis of the effect of the pressure of the injected gas and the permeability of the snow massif on the intensity of hydrate formation.

Influence of Gas Supply Mode on CO2 Hydrate Formation in Water Spraying Reactor

2011 ◽  
Vol 236-238 ◽  
pp. 556-561 ◽  
Author(s):  
Ying Ming Xie ◽  
Dao Ping Liu ◽  
Ni Liu ◽  
Ying Xia Qi
Keyword(s):  
Heat Transfer ◽  
Driving Force ◽  
Initial Temperature ◽  
Formation Rate ◽  
Hydrate Formation ◽  
Water Spray ◽  
Gas Hydrate Formation ◽  
Gas Consumption ◽  
Supply Mode ◽  
Gas Supply

In order to study the influence of gas supply modes on CO2 hydrate formation characteristics, a specific water spray gas hydrate formation apparatus was designed. The gas consumption and temperature variation in the process of CO2 hydrate formation under continuous and oscillating gas supply modes were researched. The experimental results showed that hydrate formation rate in the oscillating gas supply mode was greater than in the continuous gas supply mode, which indicates mass transfer driving force caused by disturbance in oscillating gas supply mode is larger than that of continuous gas supply mode. Additionally, under the same initial pressures and the same gas supplying mode, the lower the initial temperature, the larger the heat transfer drive force, and the faster the hydrate formation rate.

scholarly journals Heat Transfer Simulations of Sinusoidal Filter

2020 ◽  
Vol 6 (4) ◽  
Author(s):  
Jan Kořínek
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Natural Convection ◽  
Thermal Model ◽  
Air Flow ◽  
Final Temperature ◽  
Ansys Fluent ◽  
Active Cooling ◽  
Heat Transfer Simulation

<p class="TEEAbstract"><span lang="EN-US">This article covers various types of heat transfer simulations of a sinusoidal filter. First part is focused mainly on natural convection case including a detailed geometry thermal model of the sinusoidal filter considering air-flow in surroundings. Further, a comparison of the simplified and detailed geometries and their influences upon the final temperature field is presented. For a selected case of natural convection, comparison of two identical geometries in Ansys Fluent and StarCCM+ is showed. In the last part of this paper, results for the heat transfer simulation of the sinusoidal filter in a distributor case with active cooling are presented.</span></p>

scholarly journals Heat Transfer Related to Gas Hydrate Formation/Dissociation

10.5772/19711 ◽  
2011 ◽  
Author(s):  
Bei Liu ◽  
Weixin Pang ◽  
Baozi Peng ◽  
Changyu Sun ◽  
Guangjin Che
Keyword(s):  
Heat Transfer ◽  
Gas Hydrate ◽  
Hydrate Formation ◽  
Gas Hydrate Formation

scholarly journals Heat Transfer and Hydrodynamics in Stirred Tanks with Liquid-Solid Flow Studied by CFD–DEM Method

Processes ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 849
Author(s):  
Xiaotong Luo ◽  
Jiachuan Yu ◽  
Bo Wang ◽  
Jingtao Wang
Keyword(s):  
Heat Transfer ◽  
Temperature Field ◽  
Multiphase Flow ◽  
Convective Heat ◽  
Particle Temperature ◽  
Coupling Model ◽  
Stirred Tank ◽  
Stirred Tanks ◽  
Particle Flows ◽  
Heat Transfers

The heat transfer and hydrodynamics of particle flows in stirred tanks are investigated numerically in this paper by using a coupled CFD–DEM method combined with a standard k-e turbulence model. Particle–fluid and particle–particle interactions, and heat transfer processes are considered in this model. The numerical method is validated by comparing the calculated results of our model to experimental results of the thermal convection of gas-particle flows in a fluidized bed published in the literature. This coupling model of computational fluid dynamics and discrete element (CFD–DEM) method, which could calculate the particle behaviors and individual particle temperature clearly, has been applied for the first time to the study of liquid-solid flows in stirred tanks with convective heat transfers. This paper reports the effect of particles on the temperature field in stirred tanks. The effects on the multiphase flow convective heat transfer of stirred tanks without and with baffles as well as various heights from the bottom are investigated. Temperature range of the multiphase flow is from 340K to 350K. The height of the blade is varied from about one-sixth to one-third of the overall height of the stirred tank. The numerical results show that decreasing the blade height and equipping baffles could enhance the heat transfer of the stirred tank. The calculated temperature field that takes into account the effects of particles are more instructive for the actual processes involving solid phases. This paper provides an effective method and is helpful for readers who have interests in the multiphase flows involving heat transfers in complex systems.

Experimental Study on the Effect of Gas Hydrate Content on Heat Transfer

2015 ◽  
Author(s):  
Remi-Erempagamo T. Meindinyo ◽  
Runar Bøe ◽  
Thor Martin Svartås ◽  
Silje Bru
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Ethylene Oxide ◽  
Deep Water ◽  
Gas Hydrate ◽  
Atmospheric Pressure ◽  
Methane Hydrate ◽  
Hydrate Formation ◽  
Equilibrium Temperature ◽  
Gas Hydrate Formation

Gas hydrates are the foremost flow assurance issue in deep water operations. Since heat transfer is a limiting factor in gas hydrate formation processes, a better understanding of its relation to hydrate formation is important. This work presents findings from experimental study of the effect of gas hydrate content on heat transfer through a cylindrical wall. The experiments were carried out at temperature conditions similar to those encountered in flowlines in deep water conditions. Experiments were conducted on methane hydrate, Tetrahydrofuran hydrate, and ethylene oxide hydrate respectively in stirred cylindrical high pressure autoclave cells. Methane hydrate was formed at 90 bars (pressure), and 8°C, followed by a cooling/heating cycle in the range of 8°C → 4°C → 8°C. Tetrahydrofuran (THF) and ethylene oxide (EO) hydrates were formed at atmospheric pressure and system temperature of 1°C in contact with atmospheric air. This was followed by a heating/cooling cycle within the range of 1°C → 4°C → 1°C, since the hydrate equilibrium temperature of THF hydrate is 4.98°C in contact with air at atmospheric pressure. The experimental conditions of the latter hydrate formers were more controlled, given that both THF and EO are miscible with water. We found in all cases a general trend of decreasing heat transfer coefficient of the cell content with increasing concentration of hydrate in the cell, indicating that hydrate formation creates a heat transfer barrier. The hydrate equilibrium temperature seemed to change with a change in the stoichiometric concentration of THF and EO. While the methane hydrate cooling/heating cycles were performed under quiescent conditions, the effect of stirring was investigated for the latter hydrate formers.

Sign in / Sign up

Export Citation Format

Share Document