About of the injection of hydrate-forming gas into a layer of snow saturated with the same gas

2017 ◽  
Vol 12 (2) ◽  
pp. 219-226 ◽  
Author(s):  
A.S. Chiglintseva ◽  
V.Sh. Shagapov
Keyword(s):  
Gas Injection ◽  
Injection Pressure ◽  
Initial State ◽  
Pressure Fields ◽  
Gas System ◽  
Formation Zone ◽  
Snow Water ◽  
Self Similar ◽  
Temperature And Pressure ◽  
Similar Solutions

The problem of injecting a hydrate-forming gas into a snow massif in the initial state saturated with the same gas are solved. Self-similar solutions describing the temperature and pressure fields, the distribution of snow, water, hydrate and gas saturation in the massif are constructed. It is shown that when forming a hydrate, depending on the initial thermobaric state of the ice-gas system, as well as the intensity of gas injection, it is possible to distinguish various characteristic zones in the filtration region that differ in their structure and length. It has been established that with an increase in the gas injection pressure and a decrease in the initial snow-saturation of the massif, the volume formation zone of the hydrate increases.

scholarly journals Simulation of CH4 recovery from hydrate deposits by injection of CO2

2019 ◽  
Vol 23 (Suppl. 2) ◽  
pp. 447-454
Author(s):  
Svetlana Belova ◽  
Angelina Chiglintseva ◽  
Marat Khasanov ◽  
Olga Dudareva ◽  
Vladislav Shagapov
Keyword(s):  
Mathematical Model ◽  
Gas Hydrate ◽  
Low Temperatures ◽  
Pressure Fields ◽  
Liquid Co2 ◽  
Self Similar ◽  
Gas Hydrate Deposits ◽  
Temperature And Pressure ◽  
Similar Solutions ◽  
Frontal Boundary

The paper presents a mathematical model of CH4 recovery from gas hydrate deposits via injection of liquid CO2. The process of CH4 recovery is supposed to occur on the moving frontal boundary separating the deposit into two domains. The near domain is saturated with liquid CO2 and its hydrate while the far one is saturated with CH4 and its hydrate. Self-similar solutions describing the temperature and pressure fields were obtained. The effect of main parameters on the dynamics of the process under study was explored. It was revealed that at low temperatures of the CO2 being injected the temperature in the far domain did not exceed that of equilibrium for decomposition of CH4 gas hydrate. It was also found that with increasing pressure at which CO2 was injected into the gas hydrate do-main, the extension of the region saturated with CO2 hydrate was increasing.

scholarly journals The problem of melting ice in a porous medium saturated with ice and gas

2019 ◽  
Vol 14 (1) ◽  
pp. 59-62
Author(s):  
M.N. Zapivakhina ◽  
D.A Umerov
Keyword(s):  
Porous Medium ◽  
Warm Water ◽  
Water Ice ◽  
Higher Temperature ◽  
Self Similar ◽  
Porous Soil ◽  
Temperature And Pressure ◽  
Lower Temperature ◽  
Similar Solutions ◽  
Constructed Self

The problem of ice formation in a dry, cold, porous medium saturated with ice and gas (air) when pumping warm water is considered in a flat one-dimensional self-similar formulation. The task was considered in volume area. During the injection of warm water from the beginning deep into the reservoir, it spread in a volume region that will divide the reservoir into 3 zones. The first zone was filled with water, the second zone was filled with ice and water, and the third zone was filled with ice and gas. To describe the process of heat and mass transfer, the following hypotheses were used: the temperature of the saturated substance (water, ice or gas) is equal to the temperature of the porous medium; ice and skeleton still; water, ice and skeleton of the reservoir are incompressible; skeletal porosity is constant. On the basis of constructed self-similar solutions, a numerical analysis was performed illustrating the effect of the initial parameters of a dry porous medium saturated with ice and gas, as well as the temperature of the injected water on the temperature and pressure distribution in the porous medium. It has been established that an increase in the temperature of the injected water does not lead to a significant increase in the area of ice decomposition. It is also established that if the pressure of the injected water is increased, this will not lead to a large increase in the area of ice decomposition. However, based on the results obtained, it can be seen that the speed of movement of the melting boundary increases, in particular, as the pressure increases by <i>p<sub>e</sub></i>=0.05 MPa, the intermediate region increases by one and a half times. It was found that it is economically more profitable to pump water with a lower temperature, because water with a higher temperature slightly increases the freezing area of the porous soil.

A similarity problem of a porous material drying

2008 ◽  
Vol 6 ◽  
pp. 75-81
Author(s):  
D.Ye. Igoshin
Keyword(s):  
Mass Transfer ◽  
Porous Medium ◽  
Gas Mixture ◽  
Dimensional Problem ◽  
Vapor Mixture ◽  
Initial State ◽  
One Dimensional ◽  
Similarity Problem ◽  
Self Similar ◽  
Similar Solutions

The plano-one-dimensional problem of heat and mass transfer is considered when a porous semi-infinite material layer dries. At the boundary, which is permeable for the gas-vapor mixture, the temperature and composition of the gas are kept constant. Self-similar solutions are set describing the propagation of the temperature field and the moisture content field arising when heat is supplied. The intensity of dry flows is studied, depending on the initial state of the wet-porous medium, as well as the temperature and concentration composition of the vapor-gas mixture at the boundary of the porous medium.

Dynamics of the gas hydrate formation in a porous medium at the gas injection

2008 ◽  
Vol 6 ◽  
pp. 178-183
Author(s):  
M.K. Khasanov ◽  
N.G. Musakaev
Keyword(s):  
Porous Medium ◽  
Gas Hydrates ◽  
Gas Hydrate ◽  
Gas Injection ◽  
Hydrate Formation ◽  
Frontal Surface ◽  
Gas Hydrate Formation ◽  
Self Similar ◽  
Extended Area ◽  
Similar Solutions

The features of the gas hydrates formation at the gas injection into the porous medium initially saturated with gas and water are considered. Self-similar solutions of the axisymmetric problem describing the distribution of the main parameters in a reservoir are constructed. The solutions have been found according to which the gas hydrate formation can occur at the frontal surface or in the extended area.

Oblique waves in steady supersonic flows of Bethe–Zel’dovich–Thompson fluids

2018 ◽  
Vol 855 ◽  
pp. 445-468 ◽  
Author(s):  
Davide Vimercati ◽  
Alfred Kluwick ◽  
Alberto Guardone
Keyword(s):  
Classical Case ◽  
Dynamic Regime ◽  
Oblique Shock ◽  
Heat Conducting ◽  
Shock Adiabats ◽  
Initial State ◽  
Gas Dynamic ◽  
Classical Gas ◽  
Self Similar ◽  
Similar Solutions

Steady self-similar solutions to the supersonic flow of Bethe–Zel’dovich–Thompson fluids past compressive and rarefactive ramps are derived. Inviscid, non-heat-conducting, non-reacting and single-phase vapour flow is assumed. For convex isentropes and shock adiabats in the pressure–specific volume plane (classical gas dynamic regime), the well-known oblique shock and centred Prandtl–Meyer fan occur at a compressive and rarefactive ramp, respectively. For non-convex isentropes and shock adiabats (non-classical gas dynamic regime), four additional wave configurations may possibly occur; these are composite waves in which a Prandtl–Meyer fan is adjacent up to two oblique shock waves. The steady two-dimensional counterparts of the wave curves defined for the one-dimensional Riemann problem are constructed. In the present context, such curves consist of all the possible states connected to a given initial state (namely, the uniform state upstream of the ramp/wedge) by means of a steady self-similar solution. In addition to the classical case, as many as six non-classical wave-curve configurations are singled out. Moreover, the necessary conditions leading to each type of wave curves are analysed and a map of the upstream states leading to each configuration is determined.

The theory of injection of a hydrate-forming gas into a snow massif saturated with the same gas

2018 ◽  
Vol 13 (4) ◽  
pp. 92-98 ◽  
Author(s):  
A.S. Chiglintseva ◽  
V.Sh. Shagapov
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Gas Injection ◽  
Hydrate Formation ◽  
Temperature Fields ◽  
Gas Flow Rate ◽  
Initial State ◽  
Gas Hydrate Formation ◽  
Temperature And Pressure ◽  
The Mathematical Model

The mathematical model of the process of gas hydrate formation during gas injection into a snow massif, saturated with the same gas, is constructed. In axisymmetric formulation, analytical solutions are obtained for the distribution of temperature fields, pressures and phase saturations. It is shown that the appearance of various characteristic zones in a snow massif depends on the initial state of the gas–snow system, determined by temperature and pressure, and the mass flow rate of the injected gas. It has been established that an increase in the intensity of gas injection (gas flow rate) leads to an increase in both the length of the bulk zone of hydrate formation and the increase in the fraction of hydrate at the boundary separating the near and intermediate zones.

scholarly journals Flow Regime Analysis of the Pressure Build-Up during CO2 Injection in Saturated Porous Rock Formations

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2972 ◽  
Author(s):  
Ernestos Sarris ◽  
Elias Gravanis
Keyword(s):  
Injection Pressure ◽  
Flow Regimes ◽  
The Self ◽  
Co2 Injection ◽  
Late Time ◽  
Porous Rock ◽  
Ansys Fluent ◽  
Rock Formations ◽  
Self Similar ◽  
Similar Solutions

In this work, we are concerned with the theoretical and numerical analysis of the pressure build-up on the cap of an aquifer during CO2 injection in saturated porous rock formations in all flow regimes of the problem. The latter are specific regions of the parameter space of the plume flow, defined by the CO2-to-brine relative mobility and the buoyancy parameter (injection pressure to buoyancy pressure scale ratio). In addition to the known asymptotic self-similar solutions for low buoyancy, we introduce two novel ones for the high buoyancy regimes via power series solutions of asymptotic self-similarity equations. The explicit results for the peak value of pressure on the cap, which arises in the vicinity of the well, are derived and discussed for all flow regimes. The analytical results derived in this work are applied for the purpose of cap integrity considerations in six test cases of CO2 geological storage from the PCOR partnership, most of which correspond to high buoyancy conditions. The validity of the self-similar solutions (late time asymptotics) is verified with CFD numerical simulations performed with the software Ansys-Fluent. The result is that the self-similar solutions and the associated pressure estimations are valid in typical injection durations of interest, even for early times.

Gas Injection into Porous Reservoir Partly Saturated by Water

2015 ◽  
Vol 756 ◽  
pp. 336-341 ◽  
Author(s):  
М.K. Khasanov
Keyword(s):  
Porous Medium ◽  
Gas Injection ◽  
Hydrate Formation ◽  
Critical Conditions ◽  
Frontal Surface ◽  
One Dimensional ◽  
Gas Hydrate Formation ◽  
Porous Reservoir ◽  
Self Similar ◽  
Similar Solutions

Specific features of formation of gas hydrates due to injection of a gas into a porous medium initially filled by a gas and water are considered. Self-similar solutions to the planar one-dimensional problem are constructed, which give the distribution of main bed characteristics. The influence of the initial parameters of the porous medium and the intensity of the gas injection on the dynamics of the processes of hydrate formation is studied. The existence of solutions is demonstrated, which predict gas hydrate formation both on the frontal surface and in the volume zone. The critical conditions that separate the different modes of hydrate formation are found.

Sign in / Sign up

Export Citation Format

Share Document