Volume 42 Issue 1
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ZHANG Geng, LI Wentuo, HUANG Honglin, et al.A thermodynamic model for predicting 3D phase equilibrium surface of natural gas hydrates considering salt concentration[J]. Drilling Fluid & Completion Fluid，2025, 42（1）：90-101 doi: 10.12358/j.issn.1001-5620.2025.01.010
Citation: ZHANG Geng, LI Wentuo, HUANG Honglin, et al.A thermodynamic model for predicting 3D phase equilibrium surface of natural gas hydrates considering salt concentration[J]. Drilling Fluid & Completion Fluid，2025, 42（1）：90-101 doi: 10.12358/j.issn.1001-5620.2025.01.010
shu

A Thermodynamic Model for Predicting 3D Phase Equilibrium Surface of Natural Gas Hydrates Considering Salt Concentration

doi: 10.12358/j.issn.1001-5620.2025.01.010
  • 1.

    China University of Petroleum-Beijing, Beijng 102249

  • 2.

    Hainan Branch of CNOOC (China) Co., LTD., Haikou,Hainan 570100

  • 3.

    China University of Petroleum-Beijing at Karamay, Karamay,Xinjiang 834000

  • Received Date: 2024-09-02
  • Rev Recd Date: 2024-10-30
  • Publish Date: 2025-02-01
    Abstract
  • Accurate prediction of the thermodynamic stability of gas hydrates in salt-bearing systems is of great significance for predicting the accumulation range and determining the decomposition domain of hydrate. Therefore, considering the non-spherical characteristics of hydrate crystal cavity and the electrolyte interaction in the salt-containing system, a thermodynamic model of gas hydrate phase equilibrium considering salt concentration was established, and compared with the experimental data. The results show that the established three-dimensional phase equilibrium surface can effectively predict the thermodynamic stability of NGH, and the absolute mean relative deviation of temperature is only 0.08 in pure water, and no more than 0.15 in salt. When the molar fraction of chloride is greater than 0.02 and the pressure is higher than 20 MPa, the chemical factors cause the p-T curve to shift. When the pressure is small, the equilibrium temperature changes dramatically along the gradient of salt concentration, and the p-T curve no longer has translation characteristics. At the same time, AlCl3 has stronger inhibitory effect on CH4 hydrate than other chlorine salts when the molar fraction is the same. The lnp-X-1/T three-dimensional surface of CH4 hydrate exhibits better Clausius-Clapeyron linear behavior locally, and the surface as a whole has certain nonlinear characteristics. Moreover, the better the inhibition effect of chloride electrolyte on CH4 hydrate, the stronger the nonlinear characteristics.

     

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