Revisiting the methods for gas permeability measurement in tight porous medium

Yang, Diansen; Wang, Wei; Chen, Weizhong; Tan, Xianjun; Wang, Li Ge

doi:10.1016/j.jrmge.2018.08.012

Cited by 25 publications

(13 citation statements)

References 27 publications

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“…Because the permeability of the oxide layer (k per ) is unknown, a parameter study was performed by varying it in the range 10 À18 -10 À15 m 2 based on reported gas permeability values in tight porous medium. [26] A combined clogging model considering both the early and late stages was used for the simulation of an industrial-scale case, as shown in Figure 4. The calculations were performed in 3D.…”

Section: Configurations Of Simulation Casesmentioning

confidence: 99%

“…In this study, a range of permeabilities (10 À18 -10 À15 m 2 ) was considered based on the values reported for gas permeability in tight porous media. [26] In Figure 11, pure early-stage growth of the oxide layer over time is depicted for various values of permeability in the early-stage model. For better visualization, the quantities are presented on a logarithmic scale.…”

Section: B Effect Of the Porosity And Permeability Of The Oxide Layer...mentioning

confidence: 99%

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Mathematical Modeling of the Early Stage of Clogging of the SEN During Continuous Casting of Ti-ULC Steel

Barati¹,

Wu²,

Michelic

et al. 2021

Metall Mater Trans B

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The clogging of the submerged entry nozzle (SEN) during the continuous casting of steel can be divided into two stages: the “early stage,” when the initial layer of the clog covers the SEN refractory surface owing to chemical reactions, and the “late stage,” when the clog layer continues to grow because of the deposition of non-metallic inclusions (NMIs). In this paper, a mathematical formulation is proposed for the build-up of the initial oxide. The chemical reaction mechanism is based on the work of Lee and Kang (Lee et al. in ISIJ Int 58:1257–1266, 2018): a reaction among SEN refractory constituents produces CO gas, which can re-oxidize the steel melt and consequently form an oxide layer on the SEN surface. The proposed formulation was further incorporated as a sub-model in a transient clogging model, which was previously developed by the current authors to track the late stage of clogging. The thermodynamics and kinetics of CO production, depending on the local pressure and temperature, must be considered for the sub-model of early-stage clogging. Test simulations based on a section of an actual industrial SEN were conducted, and it was verified that the clogging phenomenon is related to the SEN refractory, the chemical reaction with the steel melt, the local temperature and pressure, and the transport of NMIs by the turbulent melt flow in the SEN. The model was qualitatively validated through laboratory experiments. The uncertainty of some parameters that govern the reaction kinetics and permeability of the oxide layer is discussed.

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Section: Configurations Of Simulation Casesmentioning

confidence: 99%

Section: B Effect Of the Porosity And Permeability Of The Oxide Layer...mentioning

confidence: 99%

Mathematical Modeling of the Early Stage of Clogging of the SEN During Continuous Casting of Ti-ULC Steel

Barati¹,

Wu²,

Michelic

et al. 2021

Metall Mater Trans B

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“…The permeability results were generated on the basis of recorded pressure variations in both ended chambers (upstream and downstream). The PDM is more suitable for measuring the permeability of tight formations compared to the steady stead method (Wang et al 2018;Yang et al 2019). Table 1 shows the properties of the cores.…”

Section: Experimental Materialsmentioning

confidence: 99%

Tight gas production model considering TPG as a function of pore pressure, permeability and water saturation

Zafar

et al. 2020

Pet. Sci.

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Threshold pressure gradient has great importance in efficient tight gas field development as well as for research and laboratory experiments. This experimental study is carried out to investigate the threshold pressure gradient in detail. Experiments are carried out with and without back pressure so that the effect of pore pressure on threshold pressure gradient may be observed. The trend of increasing or decreasing the threshold pressure gradient is totally opposite in the cases of considering and not considering the pore pressure. The results demonstrate that the pore pressure of tight gas reservoirs has great influence on threshold pressure gradient. The effects of other parameters like permeability and water saturation, in the presence of pore pressure, on threshold pressure gradient are also examined which show that the threshold pressure gradient increases with either a decrease in permeability or an increase in water saturation. Two new correlations of threshold pressure gradient on the basis of pore pressure and permeability, and pore pressure and water saturation, are also introduced. Based on these equations, new models for tight gas production are proposed. The gas slip correction factor is also considered during derivation of this proposed tight gas production models. Inflow performance relationship curves based on these proposed models show that production rates and absolute open flow potential are always be overestimated while ignoring the threshold pressure gradients.

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“…The gas pressure controller had an accuracy of 0.1% of full scale. Pulse decay method was used as coal permeability measuring method due to its shorter test durations compared to steady-state measurements (Yang et al 2019;Wei et al 2019b). The volumetric strain was calculated by measuring two axial strain gauges and two radial strain gauges.…”

Section: Experimental Apparatus and Experimental Approachmentioning

confidence: 99%

Evolution and analysis of gas sorption-induced coal fracture strain data

Liu

Pan

et al. 2020

Pet. Sci.

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Although coal swelling/shrinking during coal seam gas extraction has been studied for decades, its impacts on the evolution of permeability are still not well understood. This has long been recognized, but no satisfactory solutions have been found. In previous studies, it is normally assumed that the matrix swelling/shrinking strain can be split between the fracture and the bulk coal and that the splitting coefficient remains unchanged during gas sorption. In this study, we defined the fracture strain as a function of permeability change ratio and back-calculated the fracture strains at different states. In the equilibrium state, the gas pressure is steady within the coal; in the non-equilibrium state, the gas pressure changes with time. For equilibrium states, the back-calculated fracture strains are extremely large and may be physically impossible in some case. For non-equilibrium states, two experiments were conducted: one for a natural coal sample and the other for a reconstructed one. For the fractured coal, the evolution of permeability is primarily controlled by the transition of coal fracture strain or permeability from local matrix swelling effect to global effect. For the reconstituted coal, the evolution of pore strain or permeability is primarily controlled by the global effect.

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Revisiting the methods for gas permeability measurement in tight porous medium

Cited by 25 publications

References 27 publications

Mathematical Modeling of the Early Stage of Clogging of the SEN During Continuous Casting of Ti-ULC Steel

Mathematical Modeling of the Early Stage of Clogging of the SEN During Continuous Casting of Ti-ULC Steel

Tight gas production model considering TPG as a function of pore pressure, permeability and water saturation

Evolution and analysis of gas sorption-induced coal fracture strain data

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