A Novel Correlational Approach to Estimating Natural Gas Viscosity

Amooey, Ali Akbar

doi:10.1007/s10891-015-1249-8

Cited by 2 publications

(2 citation statements)

References 12 publications

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“…Some additional relationships need to be considered to close the equations of the NGH dissociation in porous marine sediments. Viscosity of natural gas is known as a function of temperature and pressure and can be evaluated with modification of the Amooey [50]…”

Section: Computation Of Variables and Numerical Solutionmentioning

confidence: 99%

Dynamic Characteristics of Offshore Natural Gas Hydrate Dissociation by Depressurization in Marine Sediments

Liu

Wu³

2019

Geofluids

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Dynamic characteristics of offshore natural gas hydrate (NGH) dissociation will provide the theoretical basis to analyze technical issues of oceanic hydrate exploitation. A mathematical model is developed to simulate offshore NGH dissociation by depressurization in marine sediments. Different phase combination statuses are involved in the process of NGH dissociation by taking ice melting and water freezing into account. The proposed methodology can analyze the processes of hydrate and water phase transitions, decomposition kinetics and thermodynamics, viscosity and permeability, ice-water phase equilibrium, and natural gas and water production. A set of an experimental system is built and consists of one 3-D visual reactor vessel, one isothermal seawater vessel, one natural gas and water separator, and one data acquisition unit. The experiments on offshore NGH dissociation by depressurization in 3-D marine sediments are carried out, and this methodology is validated against the full-scale experimental data measured. The results show that during the prophase, natural gas flow is preceded by water flow into the production wellbore and natural gas occupies more continuous flow channels than water under a large pressure gradient. Then, the natural gas flow rate begins to decline accompanied by an increase of water production. During the second phase, natural gas flow rate decreases slowly because of the decreased temperature of hydrate-bearing formation and low pressure gradient. The lower the intrinsic permeability in marine sediments, the later the water flow rate reaches the peak production. And the space interval of the production wellbore should be enlarged by an increase of the intrinsic permeability. The stable period of natural gas production enhances, and the water flow rate reduces with the increase of bottom-hole pressure in production wellbores. The main reason is the slow offshore NGH dissociation under the low producing pressure and the restriction of heat conductivity under the low temperature.

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Section: Computation Of Variables and Numerical Solutionmentioning

confidence: 99%

Dynamic Characteristics of Offshore Natural Gas Hydrate Dissociation by Depressurization in Marine Sediments

Liu

Wu³

2019

Geofluids

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“…These direct measurements can provide reliable and confident results; however, the disadvantages (e.g., high expense, time consuming, quantity of gas sample, availability of appropriate measuring instrument that can handle experiment at reservoir condition) limit its application. Therefore, the gas viscosity is commonly estimated from correlations, which were empirically established on database (Vesovic, 2001;Sanjari et al, 2011;Jarrahian and Heidaryan, 2014;Amooey, 2015) with scarce theoretical guidance.…”

Section: Introductionmentioning

confidence: 99%

A theoretical model for the density and temperature dependent viscosity of hydrocarbon gases

Yang¹,

Zhu²

2016

Petroleum Science and Technology

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Based on statistical mechanics, a theoretical model for the density and temperature-dependent viscosity of hydrocarbon gas has been developed. In the model, the averaged intermolecular attractive potential was suggested as a power function of density, and the viscosity was derived as an exponential function of the potential. In the evaluation, the derived equation was found in good agreement with reliable literature data with averaged and maximum absolute percent deviations of 0.34% and 0.98%, and comprehensively performed better than several selected methods. The performances showed the success of the theoretical model, and revealed application potentials in the natural gas industry.

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A Novel Correlational Approach to Estimating Natural Gas Viscosity

Cited by 2 publications

References 12 publications

Dynamic Characteristics of Offshore Natural Gas Hydrate Dissociation by Depressurization in Marine Sediments

Dynamic Characteristics of Offshore Natural Gas Hydrate Dissociation by Depressurization in Marine Sediments

A theoretical model for the density and temperature dependent viscosity of hydrocarbon gases

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