DBPapers
DOI: 10.5593/sgem2012/s05.v2008

MODELLING OF METHANE FLOW IN POROUS ENVIRONMENT WITH ONE ACTIVE DEGASSING BOREHOLE LOCATED IN THE CAVERN USING THE CFD PROGRAMME FLUENT

P. STASA, V. KEBO, V. STRAKOS, P. FUCHSIKOVA
Wednesday 1 August 2012 by Libadmin2012

References: 12th International Multidisciplinary Scientific GeoConference, www.sgem.org, SGEM2012 Conference Proceedings/ ISSN 1314-2704, June 17-23, 2012, Vol. 2, 487 - 494 pp

ABSTRACT

The article deals with modelling and simulation of methane flow from the underground
to the surface through the rocks, where active degassing borehole is located into the
cavern. The model of the natural environment is based on information which was
obtained during solving the Grant GACR No. 105/98/KO45.
The model of environment corresponds to the degree of our knowledge about real
situation and tools possibilities for modelling and simulation. The rock material is
composed by two types of solid rocks with different permeability and one active
degassing borehole, which is cased into the cavern, in the analysis model. Our task is to
determine how the flow of methane through borehole with perforations will changed by
permeability of rocks changing and next by implementation and comparison of several
ways of degassing from porous environment. Article responds to the need for
knowledge of natural processes in this field.
The exclusiveness of our approach involves the effort at visualising and showing how
the gas will behave in a porous environment in the model situations we put to the test.
Unless numerical flow technology, generally referred to as CFD programmes [1], is
used, the situation in the underground may practically never be identified and it is
specifically thanks to the use of the Fluent programme that we can theoretically model
and subsequently realise how the surrounding conditions may change and affect flow
from the underground to the surface and change the immediate conditions there.
The Gambit software tool was used when creating the geometrical model of the working
area; the CFD Fluent software by ANSYS, Inc. [2] was used to model gas flow.

Keywords: modelling and simulation, flow of gases, CFD program, Fluent, degassing,
methane, cavern