Kinetics and Thermodynamics of Gas Hydrate Formation in CaCl2, MgCl2 and NaCl Aqueous Solutionsтезисы докладаЭлектронная публикацияНаучно-популярная статьяТезисы
Аннотация:The East Siberian gas-condensate fields in Russia have some specific conditions for gas
production. The low gas-bearing horizon temperatures, high mineralization of formation water,
the salt deposits in porous space in gas-bearing horizon and low water dew point of natural gas
complicate the technology of natural gas recovery. All these factors cause the technological
problems as the secondary hydrate formation in bottom-hole area and hydrate and salt plugging in
wellbore and gathering pipelines. The investigation of hydrate formation kinetics is necessary in
wide range of pressure and temperature to optimize thermodynamic conditions in wellbore and
gas gathering pipelines. The study of methane hydrate formation in highly mineralized solutions
proves the methods of hydrate plugging prevention.
The kinetics of methane hydrate formation in highly mineralized solutions was studied. The
experimental hydrate cell was constructed based on gas-liquid reactor with “pressure-
temperature” automatic control system. The control system was able to measure the methane
quantity to maintain the gas pressure in the process of gas hydrate formation. The procedures to
study the kinetics of hydrate formation in mineralized water were developed in pressure range 2.5
– 15.0 MPa. The hydrate formation in aqueous solutions of Na chlorides was studied. The kinetic
model for hydrate formation in mineralized water was presented. The dependency of kinetic
constants on the process driving force was discussed.
It was experimentally shown the formation rate of the methane hydrate in mineralized water was
lower at the same driving force in comparison with pure water. This was explained by the
diffusion mechanism of hydrate formation.
