The LArge Reservoir Simulator (LARS) was developed to investigate various processes during gas hydrate formation and dissociation under simulated in situ conditions of relatively high pressure and low temperature (close to natural conditions). To monitor the spatial hydrate distribution during hydrate formation and the mobility of the free gas phase generated during hydrate dissociation, a cyli...

The effect of water sorption on the mobility of molecules on the surface of a crystalline anhydrous solid was investigated to understand the mechanism of its transformation to the corresponding hydrate. Theophylline was chosen as the model compound. The transition water activity for anhydrate to hydrate transformation, RH(T), and the deliquescence RH, RH(0), was determined to be 62% and 99%, re...

We calculate structures and thermochemical parameters for H2SO4•(H2O)n, HSO4 •(H2O)n, H2SO4•NH3•(H2O)m and HSO4 •NH3•(H2O)m clusters (with n = 0 ... 4 and m = 0 ... 1) using the MP2/aug-cc-pV(D + d)Z quantum chemical method, with higher-order corrections computed at the MP2/aug-cc-pV(T + d)Z and MP4/aug-cc-pV(D + d)Z levels. Equilibrium constants for hydrate formation at different temperatures ...

In this study we evaluate the response of oceanic subsurface systems to thermal stresses caused by the flow of warm fluids through non-insulated well systems crossing hydrate-bearing sediments. Heat transport from warm fluids, originating from deeper reservoirs under production, into the geologic media can cause dissociation of the gas hydrates. The objective of this study is to determine wheth...

Gas hydrates in pipelines is still a flow assurance problem the oil and gas industry requires proactive hydrate plugging risk predicting model. As an active area of research, this work has developed 3D 10 m length by 0.0204 diameter horizontal pipe CFD model based on eulerian-eulerian multiphase modelling framework to predict deposition rate gas-dominated pipeline. The proposed simulates condit...

We have used small-angle neutron scattering to characterize the polymer conformations of four nonionic water soluble polymers: poly~ethylene oxide!, poly~N-vinyl-2-pyrollidone!, poly~N-vinyl-2-caprolactam!, and an N-methyl, N-vinylacetamide/N-vinyl-2-caprolactam copolymer. The last three of these are able to kinetically suppress hydrate crystallization, and their inhibitor activity ranges from ...

Because of availability, as well as economical and environmental considerations, natural gas is projected to be the premium fuel of the 21st century. Natural gas production involves risk of the shut down of onshore and offshore operations because of blockage from hydrates formed from coproduced water and hydrate-forming species in natural gas. Industry practice has been usage of thermodynamic i...