Features of fluid dynamics in long-term heterogeneous gas reservoirs
https://doi.org/10.17073/2500-0632-2022-1-18-29
Abstract
Geological features are characterized by macro- and micro-heterogeneity, manifested by the spatial variability of material composition and lithophysical properties of rocks. This, in turn, determines the spatial and temporal variability of hydrocarbon (HC) fluid dynamics both during the reservoir formation and during its development and, subsequent operation as an underground gas storage facility (UGSF). The long-term operation of underground gas reservoirs at the Galmas and Garadagh areas in the South Caspian Basin (SCB), serving as a reservoir of commercial gas accumulations, and subsequent underground gas storage (UGSF) is characterized by significant peculiarities. Analysis of monitoring data on volumes of gas injection and extraction at the Galmas/Garadagh UGSF in the period of 2020–2021 showed their spatial variability, as well as the variability of wells deliverability during the gas reservoir development. This suggests the inherited nature of UGSF operation mode in relation to the gas reservoir development mode. The heterogeneous nature of spatial variability of these parameters is determined by the reservoir rock poroperm properties. A formation pressure drop during reservoir development is accompanied by decreasing rock permeability. When operating UGSF, the lithofacial properties of rocks determine the ratio of volumes of injected and extracted gas. In this regard, a necessary condition for selecting the optimal system of UGSF operation is to take into account the spatial heterogeneity of the underground reservoir. The irregular nature of variation of rock poroperm properties, the origination of isolated zones in the reservoir with considerable residual gas volumes, as well as unpredictable directions of fluid movement are the main reasons for decreased efficiency of field development and underground gas storage facility operation. In order to determine the optimal system of operation of UGSF in depleted underground oil and gas reservoirs, the features of the spacial variations resulting from the rocks poroperm properties need to be taken into account.
Keywords
underground gas storage facility,
reservoir,
rocks,
reservoir poroperm properties,
porosity,
permeability,
spatial heterogeneity,
gas-condensate reservoir,
fluid dynamics,
South Caspian Basin
Supporting agencies: This study was carried out with the financial support of the Fund of the State Oil Company of Azerbaijan Republic (SOCAR) - Grant No. 06LR – AMEA.
About the Authors
A. A. Feyzullayev
Institute of Geology and Geophysics of the National Academy of Sciences of Azerbaijan; Institute of Oil and Gas of the National Academy of Sciences of Azerbaijan
Azerbaijan
Azerbaijan
Akper A. Feyzullayev – Dr. Sci. (Geol. and Mineral.), Professor, Head of Department of Institute of Geology and Geophysics,National Academy of Sciences of Azerbaijan
Scopus ID 24170958500
Baku
A. G. Gojayev
Gas Storage Facility Operation Department of “Azneft” Production Association, State Oil Company of the Azerbaijan Republic (SOCAR)
Azerbaijan
Azerbaijan
Araz G. Gojayev – Cand. Sci. (Geol. and Mineral.), Chief Geologist
Scopus ID 57222324518
Baku
I. M. Mamedova
«Oil and Gas» Research Projective Institute, SOCAR
Azerbaijan
Azerbaijan
Irada M. Mamedova – Cand. Sci. (Geol. and Mineral.), Chief of Laboratory
Scopus ID 24178644200
Baku
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Review
For citations:
Feyzullayev A.A., Gojayev A.G., Mamedova I.M. Features of fluid dynamics in long-term heterogeneous gas reservoirs. Mining Science and Technology (Russia). 2022;7(1):18-29. https://doi.org/10.17073/2500-0632-2022-1-18-29
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