«Equipment and technologies for oil and gas complex»

FORMATION FEATURES OF METHANE MASS TRANSFER IN THE INTERBEDDED ROCKS

UDC: 622.33
DOI: 10.33285/1999-6934-2021-3(123)-71-78

Authors:

¹ Institute of Comprehensive Exploitation of Mineral Resources Russian Academy of Sciences, Moscow, Russian Federation

Keywords: coal seam; methane; filtration; permeability; mass transfer; coal massif; interlayer; stress-strain state; geo-mechanical numerical models; filtration numerical models

Annotation:

Over the years of underground mining of coal deposits, it has been revealed that methane is released from the enclosing rocks into the worked-out area, often in large quantities both in a quasi-static and dynamic form under various technological schemes and geological conditions of field development. This paper presents the theoretical aspects of developing geo-mechanical and filtration models which describe the formation of gas reservoirs and methane mass transfer of in a rock when developing a single horizontal coal seam. Using these models, the regularities of the development in time of the stress-strain state of the rock mass during the development of the formation by a long face were obtained. In particular, the zones of unloading and surcharging in the roof and soil of the formation were obtained, based on which the parameters of the induced porosity and permeability in the enclosing rock mass were determined. These parameters will make it possible to simulate the transfer of methane from the surrounding massif to the mined-out space (goaf). The theoretical foundations of the method for determining the permeability of rocks in the mode of non-stationary filtration are presented.

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