Wyniki wyszukiwania - BazTech

1

Gas seepage equations of the coal seam under the action of moisture and the stress field

Li B., Li P., Sun D. H., Zhang L. L., Wei C. F., Borisyuk Y. A.

Journal of Power Technologies

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2015

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Vol. 95, nr 4

250--257

EN

A seepage experiment was conducted in relation to a loaded coal mass with various moisture content and working conditions using self-developed tri-axial gas seepage equipment. A briquette sample was used as the research object. The change in the relationship of coal mass permeability under the combined action of moisture content and effective stress was studied experimentally. The relational function was established between coal mass permeability under this combined action and the seepage equation expressing gas migration in the coal seam. The research showed the following: (1) the moisture content of coal heavily influences effective permeability, as coal mass permeability decreases in a quadratic polynomial relationship with the increase of effective stress at constant moisture content; (2) at constant moisture content in the coal mass, coal mass permeability gradually declines in a negative exponent relationship with the increase of effective stress. Moreover, coal seam gas seepage equations under the combined action of moisture and stress field were put forward based on experimental results, the law of mass conversation and Darcy’slaw.

2

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

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

Acta Geophysica

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2014

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Vol. 62, no. 6

1373--1386

EN

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.

3

Aparatura pomiarowa do badań filtracji gazów przez brykiety węglowe w warunkach trójosiowego obciążenia

Topolnicki J., Kudasik M.

Prace Instytutu Mechaniki Górotworu PAN

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2008

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Vol. 10, no. 1-4

55--61

PL

Artykuł ten opisuje budowę aparatury pomiarowej do badań filtracji gazów przez brykiety węglowe poddawane obciążeniom mechanicznym. Zbudowany układ umożliwia pomiar i akwizycję wszystkich niezbędnych danych pomiarowych, a także regulację parametrów wejściowych eksperymentu. Gaz z układu stabilizacji ciśnienia podawany jest na czoło brykietu, który obciążany jest przy pomocy prasy śrubowej. Siła obciążająca brykiet jest mierzona dynamometrem tensometrycznym. Gaz po opuszczeniu brykietu przepływa poprzez zawór tłumiący do miernika przepływu gazu. Artykuł szczegółowo opisuje budowę i zasadę działania podukładu prasy śrubowej, a także przedstawia przebieg procesu pomiaru na zbudowanej aparaturze oraz przykładowe wyniki pomiarów.

EN

This article describes a project of a measuring system for gas seepage through coal briquettes under mechanical loads. The system enables measurements and acquisition of all necessary data and control of input parameters. The gas from the pressure stabilizer system reaches the briquette’s input surface. The loading of the briquette is genereted by screw press and measured by means of a dynamometric extensometer. The gas which flows out of the briquette passes through the damping valve and reaches the capillary flow meter. This article presents in detail the design and the functioning of the screw press subsystem. It also shows the measuring procedure and some results of the measurements.

4

Phenomenological description of gas seepage in coal briquettes

Topolnicki J., Wierzbicki M.

Bulletin of the Polish Academy of Sciences. Earth Sciences

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2000

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Vol. 48, nr 1

75-84

EN

The paper presents the results of studies on stationary gas seepage in coal briquettes of variable porosity. The measurement procedures are presented. Interpretation of the results is based on Darcy's law and two phenomenological formulae. Standard deviation from the plotted line representing the relationship between the real volumetric flow rate, and that derived from the relevant formulae, is taken as the measure of accuracy. In all cases considered here the phenomenological formulae prove to be more adequate for the description of gas seepage processes.