The replacement of methane hydrate in the reservoir by injection into the liquid carbon dioxide

2017 ◽  
Vol 12 (2) ◽  
pp. 206-213 ◽  
Author(s):  
O.F. Shepelkevich
Keyword(s):  
Carbon Dioxide ◽  
Methane Hydrate ◽  
Hydrate Formation ◽  
Liquid Carbon ◽  
Liquid Carbon Dioxide ◽  
Free Gas ◽  
Methane Gas ◽  
Hydrate Reservoir ◽  
Piston Displacement ◽  
Hydrate Saturation

The paper deals with the process of injecting liquid carbon dioxide into a hydrate reservoir. It is shown that the process of methane replacement in a hydrate reservoir by injecting liquid carbon dioxide into it can consist of the following steps: piston displacement of free gas from the pores; replacement of methane with liquid carbon dioxide, its dissolution and leaching from the formation; completion of hydrate formation and leaching of the remaining methane gas from the hydrate reservoir. We have presented the distributions of pressure, density, hydrate saturation and temperature at different times.

scholarly journals Mathematical Model of Decomposition of Methane Hydrate during the Injection of Liquid Carbon Dioxide into a Reservoir Saturated with Methane and Its Hydrate

Mathematics ◽  
2020 ◽  
Vol 8 (9) ◽  
pp. 1482
Author(s):  
Marat K. Khasanov ◽  
Nail G. Musakaev ◽  
Maxim V. Stolpovsky ◽  
Svetlana R. Kildibaeva
Keyword(s):  
Carbon Dioxide ◽  
Mathematical Model ◽  
Gas Hydrate ◽  
Hydrate Formation ◽  
Liquid Carbon ◽  
Liquid Carbon Dioxide ◽  
Methane Gas ◽  
The Third ◽  
Consistent Description ◽  
The Right

The article describes a mathematical model of pumping of heated liquid carbon dioxide into a reservoir of finite extent, the pores of which in the initial state contain methane and methane gas hydrate. This model takes into account the existence in the reservoir of three characteristic regions. We call the first region “near”, the second “intermediate”, and the third “far”. According to the problem statement, the first region contains liquid CO2 and hydrate, the second region is saturated with methane and water, the third contains methane and hydrate. The main features of mathematical models that provide a consistent description of the considered processes are investigated. It was found that at sufficiently high injection pressures and low pressures at the right reservoir boundary, the boundary of carbon dioxide hydrate formation can come up with the boundary of methane gas hydrate decomposition. It is also shown that at sufficiently low values of pressure of injection of carbon dioxide and pressure at the right boundary of the reservoir, the pressure at the boundary of hydrate formation of carbon dioxide drops below the boiling pressure of carbon dioxide. In this case, for a consistent description of the considered processes, it is necessary to correct the mathematical model in order to take into account the boiling of carbon dioxide. Maps of possible solutions have been built, which show in what ranges of parameters one or another mathematical model is consistent.

The theory of injection of liquid carbon dioxide in formation, saturated system “hydrate of methane–methane” in the mode of formation of the intermediate melt zone

2016 ◽  
Vol 11 (2) ◽  
pp. 171-180 ◽  
Author(s):  
V.Sh. Shagapov ◽  
M.K. Khasanov ◽  
R.S. Bayramgulova
Keyword(s):  
Carbon Dioxide ◽  
Methane Hydrate ◽  
Liquid Carbon ◽  
Initial State ◽  
Liquid Carbon Dioxide ◽  
Infinite Layer ◽  
Partially Saturated ◽  
Melted Zone ◽  
Hydrate Saturation ◽  
Decomposition Of Methane

The scheme and the corresponding theoretical model of process of methane replacement by liquid carbon dioxide at his injection in a gas hydrate layer are offered. The flat one-dimensional automodel solution corresponding to injection of carbon dioxide in semi-infinite layer through flat border is constructed. It is fixed that such solution can contain three characteristic zones in general case: the far zone, where there is a methane filtration in the porous medium which is partially saturated by methane hydrate in the absence of phase transitions; the melted zone of products of decomposition of methane hydrate (water and methane) can be formed in the intermediate zone (this zone is formed because of heating owing to injection of warm carbon dioxide); the near zone where there is a filtration of liquid carbon dioxide in the layer which is partially saturated by hydrate of carbon dioxide. The analysis of influence of parameters of layer, his initial state (temperature, pressure and hydrate saturation) and the parameters of the injected dioxide of carbon on the various modes of filtration is conducted.

Permeability enhancement and porosity change of coal by liquid carbon dioxide phase change fracturing

2021 ◽  
Vol 287 ◽  
pp. 106106
Author(s):  
Xianfeng Liu ◽  
Baisheng Nie ◽  
Kunyong Guo ◽  
Chengpeng Zhang ◽  
Zepeng Wang ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Phase Change ◽  
Liquid Carbon ◽  
Liquid Carbon Dioxide ◽  
Porosity Change ◽  
Permeability Enhancement
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