2009 **Abstract:** In this article a thermodynamic model is presented that predicts the hydrate formation conditions for systems that contain free water, water vapor dissolved in gas, methanol, and mixed gases both hydrate and non-hydrate formers. The model is verified with experimental data. For three-phase equilibria, it has an AADP of 8.86%. The corresponding value for two-phase equilibria is 6.07% and for systems inhibited with methanol, the AADT is 1.04%. A case study is conducted to present its applicability. For this, the…

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“…The program could not only calculate the temperature at given pressures and the pressure at given temperatures of pure water, but could also simulate the temperature and pressure of seawater and pore water under different salinities. Many scholars carried out theoretical analyses and experimental research to study the phase equilibrium conditions of gas hydrate and further established the relations between critical temperature and pressure in the phase transformation of gas hydrates with different gas components . In the temperature‐pressure diagram, the relationship can be represented by the phase equilibrium curve, and the pressure parameters can be converted into depth parameters when only considering the hydrostatic pressure of overlying strata.…”

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“…The program could not only calculate the temperature at given pressures and the pressure at given temperatures of pure water, but could also simulate the temperature and pressure of seawater and pore water under different salinities. Many scholars carried out theoretical analyses and experimental research to study the phase equilibrium conditions of gas hydrate and further established the relations between critical temperature and pressure in the phase transformation of gas hydrates with different gas components . In the temperature‐pressure diagram, the relationship can be represented by the phase equilibrium curve, and the pressure parameters can be converted into depth parameters when only considering the hydrostatic pressure of overlying strata.…”

“…Many scholars carried out theoretical analyses and experimental research to study the phase equilibrium conditions of gas hydrate and further established the relations between critical temperature and pressure in the phase transformation of gas hydrates with different gas components. [27][28][29][30][31][32][33][34] In the temperature-pressure diagram, the relationship can be represented by the phase equilibrium curve, and the pressure parameters can be converted into depth parameters when only considering the hydrostatic pressure of overlying strata. Therefore, the depth-temperature diagram can be used to replace the pressure-temperature diagram.…”

“…Drilling the wellbore is the first and essential step to explore the gas hydrate bearing sediments in permafrost regions [18] . The nature of borehole instability essentially is a common problem caused by mechanically unbalanced borehole pressures.…”

“…The model has been simultaneously compared with CSMHYD, a thermodynamic model developed by Sloan (1998). Details of the hydrate model used in this paper, including verification with experimental data can be found in Osiadacz et al (2009) and in Osiadacz et al (2012).…”