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Experimental assessment of gas-leak in face joints and conducting experiment

100%

Kalda G.

2003

tom z. 35 [204]

91-96

Paper represents theoretical assessment of gas-leak in joints of gas-systems. Leak-rate of a gas so as liquid depends on many factors, including micro geometry of jointed surfaces, physical and mechanical characteristics of contacting materials, load, pressure drops and properties of gas. Paper studies elastic contact of smooth surface against to the rough one modulated with isotropic Gaussian field. Gas-leak in jointed surfaces is calculated using law of gas filtration through porous materials. Pressing of contacting surfaces was considered as porous materials. The equation to calculate gas-leak rate was found for viscous, molecular and transient gas flow. It's shown that height parameters of roughness of contacting surfaces have dominant effect on leakproofness of joint.

Praca zawiera teoretyczną ocenę wycieku gazu w spoinach czołowych w systemach gazowych. Tempo wycieku gazu w stanie płynnym zależy od wielu czynników, wliczając mikrogeometrię łączonych powierzchni, fizyczne i mechaniczne cechy łączonych materiałów, ładunku, spadków ciśnienia i własności gazu. W pracy opisano elastyczny kontakt gładkiej powierzchni z szorstką, która powoduje modulacje z izotropowym polem Gaussa. Wycieki gazu w łączonych powierzchniach są obliczane na podstawie prawa filtracji gazu przez porowate materiały. Nacisk łączonych powierzchni został rozważony jako porowate materiały. Równanie do obliczenia tempa wycieku gazu zostało znalezione dla lepkiego, molekularnego i przejściowego przepływu gazu. Pokazuje to, że wartość parametrów chropowatości łączonych powierzchni ma dominujący wpływ na szczelność spoiny.

Shallow gas accumulations and seepage in the sediments of the Northeast Persian Gulf

72%

Hosseinyar G. , Moussavi-Harami R. , Behbahani R.

tom Vol. 62, no. 6

1373--1386

Shallow gas accumulations and gas seepage may indicate deeper hydrocarbon reservoirs. Sonar and high resolution seismic recordings were carried out to obtain gas migration and accumulation below seabed in Northeast Persian Gulf. Results revealed some structures and reflectivity effects, for example few pockmarks, gas seepage, and other surface structures in sonar and seismic data. Most of the features observed on seismic data were located at depths between 5 and 10 m (sub-sea bed) that include acoustic blanking and turbidity, gas packets, gas chimneys, and enhanced reflection. Most of the gas is accumulated on young and thin parallel layers, but the presence of acoustic effect in Aghajari Formation indicates that the origin of the gas accumulation in shallow strata may be located in a deeper reservoir.

Simulation on the dispersion of natural gas and its volume cloud distribution on an offshore fixed platform

72%

Cao Y. , Wang H. , Wang H. , Gao Y. , Sun S.

Archives of Mining Sciences

2024

tom Vol. 69, no. 2

191--209

The formation, migration and volume distribution of gas clouds, which are dominated by natural gas after oil and gas leakage, are the material basis of fire and explosion accidents on offshore platforms. Based on an offshore platform as the background, this paper conducts research on the gas cloud using numerical simulation method, the selection of different wind speeds, leak leakage rate of quality, wind direction and the direction angle, the leakage of gas diffusion behaviour simulation studies and its size distribution. There is a “coupling” effect on the volume value of 5% CH4 cloud between different wind speeds, leakage mass rates, and wind direction and leakage direction. When the wind speed is 13 m/s, the leakage mass velocity is 8 kg/s, and the included angle between wind direction and leakage direction is 180°, the “coupling” effect on the volume value of 5% CH4 cloud increases significantly. The above research results can provide a reference for the reasonable division of process risk area, firewall design and quantitative risk assessment of fire and explosion of an offshore platform.