[1] We developed a multicomponent, multiphase, fluid and heat flow model to describe hydrate formation in marine sediments; the oneand two-dimensional model accounts for the dynamic effects of hydrate formation on salinity, temperature, pressure, and hydraulic properties. Free gas supplied from depth forms hydrate, depletes water, and elevates salinity until pore water is too saline for further...

Under ambient conditions, water freezes to either hexagonal ice or a hexagonal/cubic composite ice. The presence of hydrophobic guest molecules introduces a competing pathway: gas hydrate formation, with the guests in clathrate cages. Here, the pathways of the phase transitions are sought as sequences of states with coexisting phases, using a generalized replica exchange algorithm designed to s...

In this study the enthalpies of dissociation for pure methane and pure carbon dioxide was calculated using a hydrate equilibrium data obtained in this study. The enthalpy of dissociation was determined using Clausius-Clapeyron equation. The results were compared with the values reported in literature obtained using various techniques. Keywords—Enthalpies of dissociation, methane, carbon dioxide...

Natural gas hydrate is a potential energy source in the future, which widely occurs nature and industrial activities, its formation decomposition are identified by phase equilibrium. The calculation of multicomponent equilibrium more complex than that single component gas, depends on accurate model characterized enthalpy free energy. Based Kvamme-Tanaka statistical thermodynamic model, theoreti...

• Hydrate synthesis and decomposition occur simultaneously throughout phase transition process. growth habit is not monotonous change in fractured-porous medium sandstone at different stages of transition. occurences differs from that porous matrix system. The preferential occurence hydrates fracture leads to significantly permeability changes. Natural gas hydrate, as an efficient clean energy ...

In this paper we carry out numerical analysis for a family of simplified gas transport models with hydrate formation and dissociation in subsurface, equilibrium non-equilibrium conditions. These are adequate simulation phase change at basin shorter time scales, but the does not account directly related effects evolving hydraulic properties. To our knowledge is first such model. It carried steps...

Almost 40% of undiscovered hydrocarbon reserves have high CO2 and H2S concentrations around the globe. So it is crucial to understand these systems’ thermophysical properties for excellent design production facilities. An experimental investigation conducted in this study evaluate thermodynamic conditions gas hydrate formation natural systems with levels dominant multiphase (high level gases, d...

CO2 hydrate formation and dissociation are the fundamental processes for investigating hydrate-based carbon storage. To better understand phase behaviors in presence of surfactant solid additives, this study reports effects Sodium Dodecyl Sulfate (SDS) micron Cu particles on hydrates porous quartz sands a lab-scale reactor. This research is part wider focused defining properties produced via ga...

We present the application of a mathematical method reported earlier by which the van der Waals-Platteeuw statistical mechanical model with the Lennard-Jones and Devonshire approximation can be posed as an integral equation with the unknown function being the intermolecular potential between the guest molecules and the host molecules. This method allows us to solve for the potential directly fo...