2016_EJRNL_PP_S__SINA_HOSSEINI_BOOSARI_1.pdf
Terbatas  Suharsiyah
» Gedung UPT Perpustakaan
Terbatas  Suharsiyah
» Gedung UPT Perpustakaan
Thousands of horizontal wells are drilled into the shale formations across the U.S. and hydrocarbon
production is substantially increased during past years. This fact is accredited to advances obtained
in hydraulic fracturing and pad drilling technologies. The contribution of shale rock surface
desorption to production is widely accepted and confirmed by laboratory and field evidences.
Nevertheless, the subsequent changes in porosity and permeability due to desorption combined
with hydraulic fracture closures caused by increased net effective rock stress state, have not been
captured in current shale modeling and simulation. Hence, it is essential to investigate the effects of
induced permeability, porosity, and stress by desorption on ultimate hydrocarbon recovery.
We have developed a numerical model to study the effect of changes in porosity, permeability
and compaction on four major U.S. shale formations considering their Langmuir isotherm
desorption behavior. These resources include; Marcellus, New Albany, Barnett and Haynesville
Shales. First, we introduced a model that is a physical transport of single-phase gas flow in shale
porous rock. Later, the governing equations are implemented into a one-dimensional numerical
model and solved using a fully implicit solution method. It is found that the natural gas production
is substantially affected by desorption-induced porosity/permeability changes and geomechancis.
This paper provides valuable insights into accurate modeling of unconventional reservoirs that is
more significant when an even small correction to the future production prediction can enormously
contribute to the U.S. economy