Method predicts hydrates for high-pressure gas streams

A procedure is presented for extending the pressure range for estimating hydrate formation in high-pressure gas wells such as those being developed in the North Sea. The method applies for uninhibited as well as methanol and ethylene glycol inhibited hydrate-forming conditions of pure components and...

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Bibliographic Details
Published in:The Oil & gas journal 1993-08, Vol.91 (35), p.78
Main Authors: Moshfeghian, Mahmood, Maddox, R N
Format: Magazinearticle
Language:English
Subjects:
03 NATURAL GAS
Agreements
CALCULATION METHODS
CLATHRATES
CRYSTAL STRUCTURE
Estimating techniques
FORECASTING
GAS HYDRATES
Gases
HYDRATES
Hydrocarbons
Improvements
MATHEMATICAL MODELS
MORPHOLOGY
Natural gas
Oil wells
Oilfield equipment & services
PHYSICAL PROPERTIES 033000 > Natural Gas-- Properties & Composition
PIPELINES
SYNTHESIS
Technological change
Temperature
THERMODYNAMIC PROPERTIES
Wells
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Summary:A procedure is presented for extending the pressure range for estimating hydrate formation in high-pressure gas wells such as those being developed in the North Sea. The method applies for uninhibited as well as methanol and ethylene glycol inhibited hydrate-forming conditions of pure components and natural gas mixtures. The suggested new method is an extension of a previous procedure from Maddox et al. (1991) that includes the influence of pressure on the enthalpy change accompanying hydrate formation. For the new model, the basic calculation uses enthalpies of formation and water activity coefficients correlated with the Margules equation. When tested against available data and compared with available methods, the new method provides significantly improved hydrate formation temperature predictions over a wide range of pure components, mixtures, temperatures, pressures, and inhibitor concentrations.
ISSN:0030-1388
1944-9151