Optimized schemes of enhanced shale gas recovery by CO2-N2 mixtures associated with CO2 sequestration

Ma, Haoming; Yang, Yun; Zhang, Yuming; Li, Ziyan; Zhang, Kai; Xue, Zhenqian; Zhan, Jie; Chen, Zhangxin

doi:10.1016/j.enconman.2022.116062

Cited by 30 publications

(6 citation statements)

References 44 publications

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“…In this paper, the z -factor, viscosity, and density of gas mixture equations are calculated on the basis of previous studies. − ,,,,,,,,,,,− In the future, this model will be further validated with experimental data.…”

Section: Results and Discussionmentioning

confidence: 99%

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confidence: 99%

“…The compressibility factor is widely used in the petroleum industry and can be expressed as eqs –. , In addition, the viscosity, average molecular free path, Knudsen number, fracture geometry, and other parameters of mixed gas in shale reservoir need to be characterized. The relevant analytical expressions are shown below. − where Z i is the compressibility factor of i th gas under the condition of high temperature and pressure, dimensionless; P ri and T ri are contrastive pressure and temperature, Pa & K, respectively; P ci and T ci are critical pressure and temperature, Pa & K, respectively; Z mixture is the compressibility factor of shale mixed gas under the condition of high temperature and pressure, dimensionless; μ real, i is the gas viscosity under the condition of high temperature and pressure, Pa·s; μ real,mixture represents the gas mixture viscosity under the condition of high temperature and pressure, Pa·s; λ real, i represents an average molecular free path of i th gas under the condition of high temperature and pressure, m ; λ real,mixture is an average molecular free path of gas mixture under the condition of high temperature and pressure, m ; Kn real, i is the Knudsen number under the condition of high temperature and pressure, dimensionless; Kn real,mixture is the Knudsen number of gas mixture under the condition of high temperature and pressure, dimensionless; and r equivalent is an equivalent radius, m . Based on the basic equations above, the modified slip flow can be modeled as Conductivity Due to the gravitational attraction of methane and other gases on the shale wall, some gases are adsorbed on the shale surface. The transport of these adsorbed gases to shale gas cannot be ignored.…”

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Real Gas Effect and Bulk Diffusion Characteristics of Shale Mixed Gas Transport in Microscale Fractures

et al. 2023

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Shale gas reservoirs are rich in microscale fractures. In this paper, the characteristics of gas percolation in microscale fractures are taken as the research object. By coupling the actual gas equation, the multi-component gas equation, and the bulk gas diffusion equation, analytical solutions of the comprehensive percolation equation are obtained. Through mathematical model research, the following conclusions are obtained: (a) after considering the slip flow of the solid surface, the mass flow rate of multi-component gas under different pressure conditions increases by about 20−10,000%. (b) Different from continuous flow and slip flow, the mass flow rate of bulk gas diffusion decreases with pressure increase. (c) The intersection pressure is 31 MPa. When the pressure increases from 0.5 MPa to the pressure at the intersection point, the mass flow rate of integrated flow increases with decrease of the methane content. (d) When the pressure continues to increase from the intersection point pressure, the mass flow rate of integrated flow decreases with decrease of the methane content.

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Section: Results and Discussionmentioning

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Real Gas Effect and Bulk Diffusion Characteristics of Shale Mixed Gas Transport in Microscale Fractures

et al. 2023

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“…In practical engineering, cyclic CO 2 injection is usually used to significantly increase the output of shale condensate gas reservoirs, and at the same time, CO 2 can be stored underground to achieve carbon sequestration [21][22][23][24][25][26]. In addition, flue gas injection is also a development method of oil and gas recovery enhancement with higher economic benefits; the main components of flue gas are N 2 and CO 2 , as well as a small amount of SO 2 , CO, and NO x [27,28]. Carbon capture, utilization, and storage (CCUS) can help mitigate global warming, reach the goal of carbon peak and carbon neutrality, and promote the low-carbon transformation of socio-economic systems ultimately.…”

Section: Reservoir Characteristics Resource Distribution and Exploita...mentioning

confidence: 99%

Progress of Seepage Law and Development Technologies for Shale Condensate Gas Reservoirs

Yang

Qiao

et al. 2023

Energies

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With the continuous development of conventional oil and gas resources, the strategic transformation of energy structure is imminent. Shale condensate gas reservoir has high development value because of its abundant reserves. However, due to the multi-scale flow of shale gas, adsorption and desorption, the strong stress sensitivity of matrix and fractures, the abnormal condensation phase transition mechanism, high-speed non-Darcy seepage in artificial fractures, and heterogeneity of reservoir and multiphase flows, the multi-scale nonlinear seepage mechanisms are extremely complicated in shale condensate gas reservoirs. A certain theoretical basis for the engineering development can be provided by mastering the percolation law of shale condensate gas reservoirs, such as improvement of productivity prediction and recovery efficiency. The productivity evaluation method of shale condensate gas wells based on empirical method is simple in calculation but poor in reliability. The characteristic curve analysis method has strong reliability but a great dependence on the selection of the seepage model. The artificial intelligence method can deal with complex data and has a high prediction accuracy. Establishing an efficient shale condensate gas reservoir development simulation technology and accurately predicting the production performance of production wells will help to rationally formulate a stable and high-yield mining scheme, so as to obtain better economic benefits.

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“…The selection of suitable shale reservoirs for CO 2 sequestration is one of the decisive factors for the superiority of the carbon sequestration effect. In addition, the injection rate of the sequestered gas is also an essential factor that can influence CO 2 sequestration, and Ma et al found that the gas injection rate was initially proportional to the CO 2 sequestration performance, but had an inverse effect on the sequestration performance as the rate exceeded a threshold value. Sequestered gas sources from the industrial links contain a certain amount of impurity gas, while separation of pure CO 2 from CO 2 -rich industrial waste gas is a costly, energy-intensive and time-consuming project. , Thus, direct sequestration of a CO 2 -rich industrial waste gas is a promising carbon sequestration measure that is worth investigating for feasibility.…”

Section: Introductionmentioning

confidence: 99%

Molecular Insights into CO₂-Rich Industrial Waste Gas Enhanced Shale Gas Recovery and Sequestration in Real Shale Gas Reservoirs

Zhang,

Li,

Xin

et al. 2023

Energy Fuels

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In response to the current carbon-neutral policy, the appropriate utilization and sequestration of CO 2 -rich industrial waste gases have become a key concern in greenhouse gas management. In this work, the application of CO 2 -rich industrial waste gas for shale gas displacement and the feasibility of shale gas reservoirs as a site for CO 2rich industrial waste gas sequestration was investigated from the molecular-scale. In order to restore the extensive pore structure and complex composition of shale reservoirs, three shale slit models were developed based on the Longmaxi shale formation in Sichuan, China, with the compositions of quartz-kerogen (QK), illite-kerogen (IK), and calcite-kerogen (CK). The CH 4 displacement effect by each gas component injection in the shale slits under real reservoir conditions were studied. The results show that the gas adsorption capacities in all shale slits are ranked as SO 2 > CO 2 > NO > N 2 ≈ CH 4 > CO in the pressure range of 0.5−30 MPa. Triatomic gas molecules, including SO 2 and CO 2 , have larger molecular diameters and more intense competitive adsorption between molecules, leading to a decrease in the CH 4 displacement effect with reservoir depth. CO 2 -rich industrial waste gas in depleted shale gas reservoirs at varied water contents was investigated. It was found that an increase in water content from 0% to 4 wt % led to a decrease in CO 2 sequestration capacity and relative stability ratio of 0.52 mmol/g and 0.068, respectively, at a depth of 2 km in IK slit. The QK slit is ideal for large quantities of nontoxic exhaust gas sequestration, whereas the CK slit is suitable as a site for sequestering CO 2 -rich industrial waste gas with a relatively high level of hazardous gas. This study provides deep insights into the mechanisms of competitive adsorption and sequestration in shale slits, which is instructive for CO 2 -rich industrial waste gas enhanced recovery of shale gas and sequestration.

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Optimized schemes of enhanced shale gas recovery by CO2-N2 mixtures associated with CO2 sequestration

Cited by 30 publications

References 44 publications

Real Gas Effect and Bulk Diffusion Characteristics of Shale Mixed Gas Transport in Microscale Fractures

Real Gas Effect and Bulk Diffusion Characteristics of Shale Mixed Gas Transport in Microscale Fractures

Progress of Seepage Law and Development Technologies for Shale Condensate Gas Reservoirs

Molecular Insights into CO₂-Rich Industrial Waste Gas Enhanced Shale Gas Recovery and Sequestration in Real Shale Gas Reservoirs

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Optimized schemes of enhanced shale gas recovery by CO2-N2 mixtures associated with CO2 sequestration

Cited by 30 publications

References 44 publications

Real Gas Effect and Bulk Diffusion Characteristics of Shale Mixed Gas Transport in Microscale Fractures

Real Gas Effect and Bulk Diffusion Characteristics of Shale Mixed Gas Transport in Microscale Fractures

Progress of Seepage Law and Development Technologies for Shale Condensate Gas Reservoirs

Molecular Insights into CO2-Rich Industrial Waste Gas Enhanced Shale Gas Recovery and Sequestration in Real Shale Gas Reservoirs

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Product

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Molecular Insights into CO₂-Rich Industrial Waste Gas Enhanced Shale Gas Recovery and Sequestration in Real Shale Gas Reservoirs