Effects of heterogeneous pore closure on the permeability of coal involving adsorption-induced swelling: A micro pore-scale simulation

Zhou, Yan; Guan, Wei; Cong, Peng; Sun, Qiji

doi:10.1016/j.energy.2022.124859

Cited by 15 publications

(9 citation statements)

References 63 publications

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“…As shown in Figure 7, with an increase in stress difference, the volume of fractured elements increases, while the fracture propagation rate decreases linearly [16]. The increase in geostress difference from 1 MPa to 2 MPa increases the volume of rupture unit and the fracture extension rate, which indicates that the geostress difference can promote the tangential and normal flow of fluids within a certain range, which in turn promotes the extension of the fracture tip as well as the two sides of the fracture [17]. However, when 2 MPa increases to 3 MPa, the fracture expansion rate increases, but the volume of fracture unit decreases sharply, and the fracture channel, which plays the role of inflow, turns into the pore channel, which plays the role of seepage [18].…”

Section: R Peer Review 8 Of 14mentioning

confidence: 95%

Analysis of Multi-Fracture Extension Pattern of Horizontal Wells in Shale Reservoirs under Natural Fracture Perturbation

Wang,

Zhao,

Liu

et al. 2024

Processes

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There are many natural fractures in shale reservoirs, changes in hydraulic fracture extension patterns. In the paper, a multi-fracture extension finite element model for horizontal wells in shale reservoirs under the disturbance of natural fractures is established by combining the actual geological parameters and construction parameters of a horizontal well multi-fracturing operation in X oilfield to analyze the effects of the difference in geostress, elastic modulus, angle of natural fractures, and the number of natural fracture groups on the hydraulic fracture extension. The results show that with the increase in ground stress difference and natural fracture angle, hydraulic fractures are more likely to penetrate the natural fractures; with the increase in elastic modulus, the fracture stress and tip stress increase, the volume of rupture unit, the fracture extension width and the pore pressure concentration area decrease, and it is easy to form a long and narrow fracture; with the increase in the number of fracture groups, the connectivity of reservoir fractures increases, the extension of fractures is stronger, and it is easier to form a complex fracture network.

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Section: R Peer Review 8 Of 14mentioning

confidence: 95%

Analysis of Multi-Fracture Extension Pattern of Horizontal Wells in Shale Reservoirs under Natural Fracture Perturbation

Wang,

Zhao,

Liu

et al. 2024

Processes

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“…Hydraulic fracture propagation is complicated as hydraulic fractures interact with pre-existing complex natural fractures. The propagation path is determined by the stress distribution near the intersecting point and the features of natural fractures [28,29]. There are four types of two-fracture intersections in the two-dimensional category: (1) hydraulic fracture (HF) propagation in the original direction, without the influence of natural fracture (NF), (2) hydraulic fractures which stop spreading and are blocked by natural fractures, (3) hydraulic fractures which extend along one side of the natural fractures and (4) hydraulic fractures which flow along both sides of the NF.…”

Section: Numerical Modelmentioning

confidence: 99%

A Dynamic Propagation Numerical Model of Hydraulic Fracture Interactions with Pre-Existing Complex Natural Fractures

Li,

Zhao,

Wang

et al. 2024

Processes

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The propagation of hydraulic fractures is highly influenced by the geological structure of the reservoir in unconventional reservoirs, such as natural fractures. In this paper, a new fluid–solid coupling dynamic model was built which presents the failure mechanism of hydraulic fracture with pre-existing simple and complex natural fractures. The cohesive element method and the maximum principal stress fracture criterion were used in the new model. An analysis was conducted to investigate the impact of various factors, including encounter angle, in situ stress, elastic modulus, and Poisson’s ratio, on the propagation of hydraulic fractures. The simulation results indicate that the encounter angle and the in situ stress are the main factors affecting the fracture morphology. When the encounter angle and the in situ stress difference are small, hydraulic fractures propagate along natural fractures. When the elastic modulus is small, it is advantageous for the advancement of both hydraulic and natural fractures. The Poisson’s ratio has a slight effect on the fracture propagation pattern.

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“…where α is the slope of the decay curve in the semi-logarithmic plot, 1 s −1 ; c g is the gas compressibility, 1 Pa −1 ; f 1 is the mass flow correction factor; V u and V d are the volumes of the upstream and downstream gas storage reservoirs, m 3 . To eliminate the gas slip effect, Klinkenberg-corrected permeability, which is also considered as the absolute permeability, can be determined using equation (6) [25]:…”

Section: Data Availability Statementmentioning

confidence: 99%

“…low porosity and high irreducible water saturation of samples. Moreover, the pore closure behavior caused by adsorptioninduced swelling decreases coal's permeability and relative permeability [6], further intensifying the difficulty in applying gas-water relative permeability measurement in coal.…”

Section: Introductionmentioning

confidence: 99%

A novel method for determining water saturation of porous media in relative permeability measurement using DPT

Shen¹,

Fang²,

Li³

2022

Meas. Sci. Technol.

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The relative permeability is essential for understanding porous media's gas and water seepage characteristics and establishing production schedules in practical engineering applications. However, the movable water is too small to be detected for ultra-low permeability rocks, and it is difficult to determine the water saturation in the relative permeability measurement accurately. In this study, a differential pressure transducer (DPT) was applied to a self-developed apparatus to quantify displaced water precisely. Results indicate that (1) Both the permeability and the relative permeability measurement results show high stability in repeatability tests with the application of DPT. (2) The final cumulative water flow data measured by the DPT is reliable. The relative error of the electronic balance and DPT value was less than 4%. (3) This self-developed instrument can obtain the relative permeability curve for ultra-low permeability rocks, such as tight sandstone and anthracite coal. Although there are limitations, this technique provides an economical and reliable pathway for studying the seepage characteristics of the gas and water in ultra-low permeability rocks.

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Effects of heterogeneous pore closure on the permeability of coal involving adsorption-induced swelling: A micro pore-scale simulation

Cited by 15 publications

References 63 publications

Analysis of Multi-Fracture Extension Pattern of Horizontal Wells in Shale Reservoirs under Natural Fracture Perturbation

Analysis of Multi-Fracture Extension Pattern of Horizontal Wells in Shale Reservoirs under Natural Fracture Perturbation

A Dynamic Propagation Numerical Model of Hydraulic Fracture Interactions with Pre-Existing Complex Natural Fractures

A novel method for determining water saturation of porous media in relative permeability measurement using DPT

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