The effect of gas injection velocity and pore morphology on displacement mechanisms in porous media based on CFD approach

Yan, Zechen; Zhu, Xu; Wang, Ping; Li, Xiaofang; Yu, Shifan; Li, Yan

doi:10.1016/j.jngse.2022.104558

Cited by 10 publications

(3 citation statements)

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“…where u and v are the flow rates in the x and z directions, m/s; w is the fracture width, m; v m is the rate of leak-off. According to the N−S equation, the rate of change of fluid momentum in a fluid cell in a fracture with time is equal to the combined force acting on the fluid in the cell, 28 and the twophase fracturing fluid is considered as incompressible non-Newtonian fluid, whose momentum equation is…”

Section: Flow Model Of Two-phasementioning

confidence: 99%

“…According to the N–S equation, the rate of change of fluid momentum in a fluid cell in a fracture with time is equal to the combined force acting on the fluid in the cell, and the two-phase fracturing fluid is considered as incompressible non-Newtonian fluid, whose momentum equation is true{ .25ex2ex infix− ∂ P f ∂ x + ( ∂ τ x x ∂ x + ∂ τ x z ∂ z ) + ρ f = 0 infix− ∂ P f ∂ z + ( ∂ τ z x ∂ x + ∂ τ z z ∂ z ) + ρ ( g + f ) = 0 where τ = ( lefttrue0.25ex τ x x τ x z τ z x τ z z ) = μ ( lefttrue0.25ex 2 ∂ u ∂ x …”

Section: Mathematical Model Of Flow Patternsmentioning

confidence: 99%

“…According to the N–S equation, the rate of change of fluid momentum in a fluid cell in a fracture with time is equal to the combined force acting on the fluid in the cell, 28 and the two-phase fracturing fluid is considered as incompressible non-Newtonian fluid, whose momentum equation is where ; Pf is the fluid pressure within the fracture, which denotes continuous surface tension and reflects the effect of interfacial tension.…”

Section: Mathematical Model Of Flow Patternsmentioning

confidence: 99%

See 2 more Smart Citations

Research on Flow Patterns of Two-Phase Fracturing Fluid in Hydraulic Fracture Considering the Fluid Leak-off

Chen,

Li,

Song

et al. 2024

ACS Omega

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In in situ-generated proppant fracturing technology without proppant injection, the distribution of the flow pattern of two-phase fracturing fluid in the fracture determines the concentration of proppant particles formed by phase change in different positions. Therefore, the study of a two-phase fracturing fluid flow pattern is of great significance to reveal the formation mechanisms of different flow patterns and guide the on-site implementation of the technology. This paper establishes a mathematical model for the two-phase fracturing fluids in fractures based on their physical properties and presents numerical experiments on the flow pattern of two-phase fracturing fluids under different conditions of injection displacement, interfacial tension, and phase change liquid (PCL) ratio. The results show that at lower injection displacements, such as 3 or 4 m 3 /min, it is easier to form striped shape distributions, and at higher injection displacements, such as 5 or 6 m 3 /min, it is easier to form droplet shape distributions. When the interfacial tension is low (15 mN/ m), PCL shrinks less and is distributed in strips; when the interfacial tension is high (25, 35, and 45 mN/m), PCL shrinks more and mainly forms droplet-shaped distributions. PCL tends to form discrete droplet shape distributions at PCL volume fractions of 10, and 20%. At 30% volume fraction, PCL is distributed in strips, and at 40% volume fraction, PCL forms strips of a larger size. These findings reveal the changing pattern of two-phase fracturing fluid flow and enrich the theoretical system of in situ-generated proppant fracturing technology, which can provide theoretical support for the on-site implementation of this technology.

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Section: Flow Model Of Two-phasementioning

confidence: 99%