Limited storage and recovery of adsorbed gas in shale reservoirs - Insights from experiments and production modeling

Gas in thermally mature shale reservoirs is considered to exist as adsorbed volume in organic matter and free gas within pores and voids in natural fractures. Gas in-place is derived from summation of aforementioned volumes. Although industry has adopted laboratory-based adsorption isotherms, quanti...

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Autores principales:	Venkat S. Pathi, Clay Kurison, Ahmed M. Hakami, Ahmed O. Fataierge
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2022
Materias:	Shale gas Adsorbed gas Free gas Adsorption isotherms Reservoir flow regimes Petrophysics Fuel TP315-360
Acceso en línea:	https://doaj.org/article/3858b224b364487182cfb0dc32b160f5
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spelling	oai:doaj.org-article:3858b224b364487182cfb0dc32b160f52021-11-20T05:13:40ZLimited storage and recovery of adsorbed gas in shale reservoirs - Insights from experiments and production modeling2666-052010.1016/j.jfueco.2021.100039https://doaj.org/article/3858b224b364487182cfb0dc32b160f52022-03-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2666052021000327https://doaj.org/toc/2666-0520Gas in thermally mature shale reservoirs is considered to exist as adsorbed volume in organic matter and free gas within pores and voids in natural fractures. Gas in-place is derived from summation of aforementioned volumes. Although industry has adopted laboratory-based adsorption isotherms, quantification is still uncertain and questions on recoverability still linger. This study reevaluated in-place adsorbed gas and post-stimulation recovery. Two proprietary laboratories, using small and large mesh sizes, generated different adsorption isotherms for comparable samples of a Middle East source rock. In addition, review of published experimental studies led to the realization that confining pressures as those in situ were seldomy replicated and derived isotherms exhibited wide variability. A hypothetical scenario, using benchmarked adsorption isotherms illustrated impacts of unreliable adsorbed volume quantification on total gas in-place. From analysis of well production for three shales, matrix transient linear flow persisted for extended periods without indicating influence of boundaries. The flow regime is often matched by considering only free gas porosity. Using a sector model with 1.0 nanodarcy (nD) system permeability in reservoir simulation, a considerable proportion of the adopted grid remained above a benchmarked average critical desorption pressure after long-term post-stimulation drainage. Thus, desorption could be of limited significance in shale production if the flow model was appropriate. This study illustrated uncertainties in traditional concepts for shale gas storage and recovery. Realistic quantification of in-place adsorbed gas was found to require tailoring of laboratory protocols to account for crushed sample sizes and confinement that should match subsurface conditions such as effective vertical stress.Venkat S. PathiClay KurisonAhmed M. HakamiAhmed O. FataiergeElsevierarticleShale gasAdsorbed gasFree gasAdsorption isothermsReservoir flow regimesPetrophysicsFuelTP315-360ENFuel Communications, Vol 10, Iss , Pp 100039- (2022)
institution	DOAJ
collection	DOAJ
language	EN
topic	Shale gas Adsorbed gas Free gas Adsorption isotherms Reservoir flow regimes Petrophysics Fuel TP315-360
spellingShingle	Shale gas Adsorbed gas Free gas Adsorption isotherms Reservoir flow regimes Petrophysics Fuel TP315-360 Venkat S. Pathi Clay Kurison Ahmed M. Hakami Ahmed O. Fataierge Limited storage and recovery of adsorbed gas in shale reservoirs - Insights from experiments and production modeling
description	Gas in thermally mature shale reservoirs is considered to exist as adsorbed volume in organic matter and free gas within pores and voids in natural fractures. Gas in-place is derived from summation of aforementioned volumes. Although industry has adopted laboratory-based adsorption isotherms, quantification is still uncertain and questions on recoverability still linger. This study reevaluated in-place adsorbed gas and post-stimulation recovery. Two proprietary laboratories, using small and large mesh sizes, generated different adsorption isotherms for comparable samples of a Middle East source rock. In addition, review of published experimental studies led to the realization that confining pressures as those in situ were seldomy replicated and derived isotherms exhibited wide variability. A hypothetical scenario, using benchmarked adsorption isotherms illustrated impacts of unreliable adsorbed volume quantification on total gas in-place. From analysis of well production for three shales, matrix transient linear flow persisted for extended periods without indicating influence of boundaries. The flow regime is often matched by considering only free gas porosity. Using a sector model with 1.0 nanodarcy (nD) system permeability in reservoir simulation, a considerable proportion of the adopted grid remained above a benchmarked average critical desorption pressure after long-term post-stimulation drainage. Thus, desorption could be of limited significance in shale production if the flow model was appropriate. This study illustrated uncertainties in traditional concepts for shale gas storage and recovery. Realistic quantification of in-place adsorbed gas was found to require tailoring of laboratory protocols to account for crushed sample sizes and confinement that should match subsurface conditions such as effective vertical stress.
format	article
author	Venkat S. Pathi Clay Kurison Ahmed M. Hakami Ahmed O. Fataierge
author_facet	Venkat S. Pathi Clay Kurison Ahmed M. Hakami Ahmed O. Fataierge
author_sort	Venkat S. Pathi
title	Limited storage and recovery of adsorbed gas in shale reservoirs - Insights from experiments and production modeling
title_short	Limited storage and recovery of adsorbed gas in shale reservoirs - Insights from experiments and production modeling
title_full	Limited storage and recovery of adsorbed gas in shale reservoirs - Insights from experiments and production modeling
title_fullStr	Limited storage and recovery of adsorbed gas in shale reservoirs - Insights from experiments and production modeling
title_full_unstemmed	Limited storage and recovery of adsorbed gas in shale reservoirs - Insights from experiments and production modeling
title_sort	limited storage and recovery of adsorbed gas in shale reservoirs - insights from experiments and production modeling
publisher	Elsevier
publishDate	2022
url	https://doaj.org/article/3858b224b364487182cfb0dc32b160f5
work_keys_str_mv	AT venkatspathi limitedstorageandrecoveryofadsorbedgasinshalereservoirsinsightsfromexperimentsandproductionmodeling AT claykurison limitedstorageandrecoveryofadsorbedgasinshalereservoirsinsightsfromexperimentsandproductionmodeling AT ahmedmhakami limitedstorageandrecoveryofadsorbedgasinshalereservoirsinsightsfromexperimentsandproductionmodeling AT ahmedofataierge limitedstorageandrecoveryofadsorbedgasinshalereservoirsinsightsfromexperimentsandproductionmodeling
_version_	1718419475455279104

Limited storage and recovery of adsorbed gas in shale reservoirs - Insights from experiments and production modeling

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