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Study on equilibrium conditions of methane gas hydrates

Author Affiliations

  • 1Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, Uttarakhand, India
  • 2Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, Uttarakhand, India
  • 3Gas Hydrate Research and Technology Centre, ONGC, Panvel, Mumbai, India

Int. Res. J. Environment Sci., Volume 9, Issue (4), Pages 80-90, October,22 (2020)


Methanegas hydrates are nonstoichiometric crystalline form of solids which are form by the amalgamation of molecules of methane gas with the molecules of water at low temperature and high pressure. For oil, gas, chemical and other industries, the formation of MGHs has been a problem for many years because hydrate may block the pipelines or valves. Hydrate formation in a pipeline may also cause a blowout in the drilling operations. The knowledge of the equilibrium conditions of gas hydrate is obligatory for the economical and safe plan of operations in oil, gas, chemical industries where hydrate nucleation/formation occurred. It becomes important to measure the incipient conditions of hydrate formations for the system containing different inhibitors, promoters, salts, porous materials. The conditions of stability for MGHs in pure and seawater will be different because of the existence of ions and salts in seawater. The stability pressure of MGHs in seawater is higher than pure water, but the temperature for the gas hydrate can be lower in seawater than pure water. The stability conditions of MGHs can be disturbed by the simple addition of salts, electrolytes in the host sediments or water of MGHs. The co-existence of all dissolved ions in seawater depresses the dissociation temperature for the stability of methane hydrate ranges between pressures of 2.75-10 MPa. For seawater with a salinity of 33.5%, the observed offset in dissociation temperature was 1.1&


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