Impacts of permeability stress sensitivity and aqueous phase trapping on the tight sandstone gas well productivity - A case study of the Daniudi gas field

Zhang, Hao; Zhong, Ying; Kuru, Ergün; Kuang, Jianchao; She, Jiping

doi:10.1016/j.petrol.2019.02.044

Cited by 34 publications

(23 citation statements)

References 17 publications

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“…Particularly, fracture‐dominated rocks are highly sensitive to the opening or closure of fractures due to the changes in the normal stress across a fracture or pore‐fluid pressure (Barton et al., 1985; Cook, 1992; Huo & Benson, 2016; Vogler, Amann, et al., 2016; Vogler et al., 2018; Zimmerman et al., 1991; Zimmerman & Bodvarsson, 1996). An increase in effective normal stress tends to increase the contact area between the fracture walls and to decrease the mean mechanical aperture (Pyrak‐Nolte et al., 1987; Tsang, 1984; Vogler, Settgast, et al., 2016; H. Zhang et al., 2019). Larger contact areas between two fracture walls create large so‐called “archipelagic” regions, when under high effective stresses, which are areas filled with several small, closely spaced contact regions (Jaeger et al., 2007; Pyrak‐Nolte et al., 1987).…”

Section: Introductionmentioning

confidence: 99%

“…Particularly, fracture-dominated rocks are highly sensitive to the opening or closure of fractures due to the changes in the normal stress across a fracture or pore-fluid pressure (Barton et al, 1985;Cook, 1992;Huo & Benson, 2016;Vogler et al, 2018;Zimmerman et al, 1991;Zimmerman & Bodvarsson, 1996). An increase in effective normal stress tends to increase the contact area between the fracture walls and to decrease the mean mechanical aperture (Pyrak-Nolte et al, 1987;Tsang, 1984;Vogler, Settgast, et al, 2016;H. Zhang et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Permeability Impairment and Salt Precipitation Patterns During CO₂ Injection Into Single Natural Brine‐Filled Fractures

Lima

Schädle

Green

et al. 2020

Water Resources Research

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Formation dry‐out in fracture‐dominated geological reservoirs may alter the fracture space, impair rock absolute permeability, and cause a significant decrease in well injectivity. In this study, we numerically model the dry‐out processes occurring during supercritical CO2 (scCO2) injection into single brine‐filled fractures and evaluate the potential for salt precipitation under increasing effective normal stresses in the evaporative regime. We use an open‐source, parallel finite‐element framework to numerically model two‐phase flow through 2‐D fracture planes with aperture fields taken from naturally fractured granite cores at the Grimsel Test Site in Switzerland. Our results reveal a displacement front and a subsequent dry‐out front in all simulated scenarios, where higher effective stresses caused more flow channeling, higher rates of water evaporation, and larger volumes of salt precipitates. However, despite the larger salt volumes, the permeability impairment was lower at higher effective normal stresses. We conclude that the spatial distribution of the salt, precipitated in fractures with heterogeneous aperture fields, strongly affects the absolute permeability impairment caused by formation dry‐out. The numerical simulations assist in understanding the behavior of the injectivity in fractures and fracture networks during subsurface applications that involve scCO2 injection into brine.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Permeability Impairment and Salt Precipitation Patterns During CO₂ Injection Into Single Natural Brine‐Filled Fractures

Lima

Schädle

Green

et al. 2020

Water Resources Research

View full text Add to dashboard Cite

show abstract

“…In the last few decades, there has been a surge of interest in the characteristics of fluid flow and reservoir pressure distribution in the low permeability reservoirs [10]. Based on comprehensive consideration of threshold pressure gradient, nonlinear flow, and dynamic boundary effects, some scholars have established a large number of the percolation models of low-permeability reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Effective Utilization of Reserves in Tight Sandstone Gas Reservoirs and Their Applications

et al. 2020

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The effective utilization of reserves in tight sandstone reservoirs is one of the major concerns in terms of the development of tight sandstone gas reservoirs. However, the characteristics of reserve utilization are not fully understood, and many uncertainties still exist in the process. For this purpose, long cores on the Su 6 block of Sulige tight sandstone gas field in China were selected, and a multipoint embedded measurement system was established to study the characteristics of effective reserve utilization. Then, the effects of the related reservoir properties and production parameters were investigated. Based on the similarity theory, the effective conversion relationship between the physical experiment and the actual field production was established. The results showed that the pressure distribution in the exploitation of tight gas reservoir is nonlinear, and water cut in the reservoir will hinder the effective utilization of reserves. The lower the reservoir permeability, the larger the negative effect of water on reservoir utilization. Lower gas production rate and higher original pressure are associated with a smoother drawdown curve, which results in larger reserve utilization. The moving boundary expands with time, and its initial propagation velocity increase and then decrease. Additionally, the water cut in the reservoir can delay the spread of moving boundary propagation. The experimental results are consistent with the actual results of the field production by the similarity criterion, which can reflect and predict the production performance in tight gas reservoirs effectively. These results can provide a better understanding of reservoir pressure distribution and effective utilization of reserves to optimize the gas recovery and development benefit in tight sandstone gas reservoirs.

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“…Nevertheless, these changes affect the fracture permeability. Therefore, fluid injection/production in fracture-dominated media will inevitably be influenced by variations in effective normal stress (Zhang et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Impact of Effective Normal Stress on Capillary Pressure in a Single Natural Fracture

Lima

Schädle

Vogler

et al. 2019

Preprint

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Multiphase fluid flow through rock fractures occurs in many reservoir applications such as geological CO2 storage, Enhanced Geothermal Systems (EGS), nuclear waste disposal, and oil and gas production. However, constitutional relations of capillary pressure versus fluid saturation, particularly considering the change of fracture aperture distributions under various stress conditions, are poorly understood. In this study, we use fracture geometries of naturally-fractured granodiorite cores as input for numerical simulations of two-phase brine displacement by super critical CO2 under various effective normal stress conditions. The aperture fields are first mapped via photogrammetry, and the effective normal stresses are applied by means of a Fast Fourier Transform (FFT)-based convolution numerical method. Throughout the simulations, the capillary pressure is evaluated from the local aperture. Two approaches to obtain the capillary pressure are used for comparison: either directly using the Young-Laplace equation, or the van Genuchten equation fitted from capillary pressure-saturation relations generated using the pore-occupancy model. Analyses of the resulting CO2 injection patterns and the breakthrough times enable investigation of the relationships between the effective normal stress, flow channelling and aperturebased capillary pressures. The obtained results assist the evaluation of two-phase flow through fractures in the context of various subsurface applications.

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Impacts of permeability stress sensitivity and aqueous phase trapping on the tight sandstone gas well productivity - A case study of the Daniudi gas field

Cited by 34 publications

References 17 publications

Permeability Impairment and Salt Precipitation Patterns During CO₂ Injection Into Single Natural Brine‐Filled Fractures

Permeability Impairment and Salt Precipitation Patterns During CO₂ Injection Into Single Natural Brine‐Filled Fractures

Experimental Study on the Effective Utilization of Reserves in Tight Sandstone Gas Reservoirs and Their Applications

Impact of Effective Normal Stress on Capillary Pressure in a Single Natural Fracture

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Impacts of permeability stress sensitivity and aqueous phase trapping on the tight sandstone gas well productivity - A case study of the Daniudi gas field

Cited by 34 publications

References 17 publications

Permeability Impairment and Salt Precipitation Patterns During CO2 Injection Into Single Natural Brine‐Filled Fractures

Permeability Impairment and Salt Precipitation Patterns During CO2 Injection Into Single Natural Brine‐Filled Fractures

Experimental Study on the Effective Utilization of Reserves in Tight Sandstone Gas Reservoirs and Their Applications

Impact of Effective Normal Stress on Capillary Pressure in a Single Natural Fracture

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Product

Resources

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Permeability Impairment and Salt Precipitation Patterns During CO₂ Injection Into Single Natural Brine‐Filled Fractures

Permeability Impairment and Salt Precipitation Patterns During CO₂ Injection Into Single Natural Brine‐Filled Fractures