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Phase Behavior and ThermodynamicsGas Properties

Gas Hydrate Dissociation Pressure Formula

ph=0.1450377exp⁡([2.50744×10−3(γh+0.46852)3+1.214644×10−2Fm−4.676111×10−4Fm2+0.0720122]T+3.6625×10−4(γh−0.485054)3−5.44376Fm+3.89×10−3Fm2−29.9351)p_h=0.1450377\exp\left(\left[\frac{2.50744\times10^{-3}}{(\gamma_h+0.46852)^3}+1.214644\times10^{-2}F_m-4.676111\times10^{-4}F_m^2+0.0720122\right]T+\frac{3.6625\times10^{-4}}{(\gamma_h-0.485054)^3}-5.44376F_m+3.89\times10^{-3}F_m^2-29.9351\right)

Gas Hydrate Dissociation Pressure calculates gas hydrate dissociation pressure for gas properties workflows in phase behavior and thermodynamics.

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How engineers use this formula

Use this formula when the listed inputs (gamma_h, F_m, T) are known and the assumptions behind the cited gas properties relationship match the engineering case being checked.

Assumptions

  • Input values are representative for the well, reservoir, fluid, or equipment case being evaluated.
  • The declared units match the field-unit constants used in the formula.
  • The cited formula applies to the selected petroleum engineering workflow.

Limitations

  • The calculation does not replace a full engineering model or operating procedure.
  • Accuracy depends on the source correlation, assumptions, input quality, and unit consistency.

Common mistakes

  • Mixing unit systems without converting the inputs.
  • Using default example values as field recommendations.
  • Applying the formula outside the source assumptions.

Default example

Using the default inputs, p_h equals 795.282368 psi.

gamma_hdimensionless

0.65

F_mdimensionless

0.1

T°R

520

Inputs

gamma_h

dimensionless

Specific Gravity of Hydrate-Forming Components

F_m

dimensionless

Molar Ratio Between Non-Hydrate-Forming and Hydrate-Forming Components

T

°R

Temperature

Outputs

p_h

psi

Gas Hydrate Dissociation Pressure

Source and review

reviewed

Advanced Reservoir Engineering, Ahmed, T., McKinney, P.D. (2005)

Ahmed, T. and McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter 3, Page 274.

Source

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