TY - JOUR
T1 - Integrating micro-scale modelling with core measurements to improve natural gas production in shale gas reservoirs
AU - Kovalchuk, Natalia
AU - Hadjistassou, Constantinos
N1 - Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/6
Y1 - 2021/6
N2 - Prior to 2008, shale gas reservoirs were deemed uneconomical to produce. Hydraulic fracturing and horizontal drilling have shifted this perspective, reducing the flow resistance from the reservoir to the well. Notwithstanding the thousands of shale gas wells currently actively producing around the world, factors controlling the permeability and flow behaviour in shale gas formations are still incompletely understood. A profound understanding of the flow processes manifesting in shale gas reservoirs will contribute to more effective Enhanced Gas Recovery (EGR) schemes, ultimate recovery and accurate gas production forecasting. Owing to the micro- and nano-size of pores, transport in shale rocks depends on the pore size and predominantly on pore geometry and tortuosity. To gain new insights into the mechanics of gas production from shale formations, we constructed a geometrically accurate model from an actual shale scanning electron microscope micro-image. Taking into account the pertinent rock and gas parameters (e.g., porosity, permeability, viscosity, etc.) we have determined the gas flowrate, the pressure variations and deduced the production rate at the micro-level. A non-dimensionalisation methodology was developed which permits the comparison between micro-scale modelling results with actual core measurements several orders of magnitude larger in spatial scale. Normalised micro-scale modelling results compare well with actual core data shedding light on some of the most important aspects which govern gas flow: geometry, pressure gradient, compressibility, and permeability. Moreover, the cumulative gas production for different gases was shown to improve with an increase in the molecular mass of the gases. Ultimately, our efforts aim to tie theoretical understanding with experimental observations deemed significant for boosting the productivity of gas from shale formations.
AB - Prior to 2008, shale gas reservoirs were deemed uneconomical to produce. Hydraulic fracturing and horizontal drilling have shifted this perspective, reducing the flow resistance from the reservoir to the well. Notwithstanding the thousands of shale gas wells currently actively producing around the world, factors controlling the permeability and flow behaviour in shale gas formations are still incompletely understood. A profound understanding of the flow processes manifesting in shale gas reservoirs will contribute to more effective Enhanced Gas Recovery (EGR) schemes, ultimate recovery and accurate gas production forecasting. Owing to the micro- and nano-size of pores, transport in shale rocks depends on the pore size and predominantly on pore geometry and tortuosity. To gain new insights into the mechanics of gas production from shale formations, we constructed a geometrically accurate model from an actual shale scanning electron microscope micro-image. Taking into account the pertinent rock and gas parameters (e.g., porosity, permeability, viscosity, etc.) we have determined the gas flowrate, the pressure variations and deduced the production rate at the micro-level. A non-dimensionalisation methodology was developed which permits the comparison between micro-scale modelling results with actual core measurements several orders of magnitude larger in spatial scale. Normalised micro-scale modelling results compare well with actual core data shedding light on some of the most important aspects which govern gas flow: geometry, pressure gradient, compressibility, and permeability. Moreover, the cumulative gas production for different gases was shown to improve with an increase in the molecular mass of the gases. Ultimately, our efforts aim to tie theoretical understanding with experimental observations deemed significant for boosting the productivity of gas from shale formations.
KW - Gas composition
KW - Micro-scale
KW - Non-dimensionalisation
KW - Shale gas
UR - http://www.scopus.com/inward/record.url?scp=85100678400&partnerID=8YFLogxK
U2 - 10.1016/j.petrol.2021.108446
DO - 10.1016/j.petrol.2021.108446
M3 - Article
AN - SCOPUS:85100678400
SN - 0920-4105
VL - 201
JO - Journal of Petroleum Science and Engineering
JF - Journal of Petroleum Science and Engineering
M1 - 108446
ER -