ON TWO-PHASE FLOW IN FRACTURED MEDIA

2002 ◽  
Vol 12 (08) ◽  
pp. 1075-1107 ◽  
Author(s):  
LI-MING YEH
Keyword(s):  
Two Phase Flow ◽  
Fractured Media ◽  
Phase Flow ◽  
Fracture System ◽  
Two Phase ◽  
Fractured Medium ◽  
Matrix Block ◽  
Matrix Blocks ◽  
Capillary Pressures

A model describing two-phase, incompressible, immiscible flow in fractured media is discussed. A fractured medium is regarded as a porous medium consisting of two superimposed continua, a continuous fracture system and a discontinuous system of medium-sized matrix blocks. Transport of fluids through the medium is primarily within the fracture system. No flow is allowed between blocks, and only matrix-fracture flow is possible. Matrix block system plays the role of a global source distributed over the entire medium. Two-phase flow in a fractured medium is strongly related to phase mobilities and capillary pressures. In this work, four relations for these functions are presented, and the existence of weak solutions under each relation will also be shown.

The role of surface wettability on the heat transfer in liquid-liquid two-phase flow in a microtube

2019 ◽  
Vol 31 (8) ◽  
pp. 082004 ◽  
Author(s):  
Mahsa Moezzi ◽  
Siamak Kazemzadeh Hannani ◽  
Bijan Farhanieh
Keyword(s):  
Heat Transfer ◽  
Two Phase Flow ◽  
Surface Wettability ◽  
Phase Flow ◽  
Two Phase

HOMOGENIZATION OF TWO-PHASE FLOW IN FRACTURED MEDIA

2006 ◽  
Vol 16 (10) ◽  
pp. 1627-1651 ◽  
Author(s):  
LI-MING YEH
Keyword(s):  
Fractured Media ◽  
Two Phase ◽  
Interconnected System ◽  
Fracture Planes ◽  
Microscopic Models ◽  
Fractured Medium ◽  
Matrix Blocks ◽  
Dual Porosity Model ◽  
The Matrix ◽  
Porosity Model

In a fractured medium, there is an interconnected system of fracture planes dividing the porous rock into a collection of matrix blocks. The fracture planes, while very thin, form paths of high permeability. Most of the fluids reside in matrix blocks, where they move very slow. Let ε denote the size ratio of the matrix blocks to the whole medium and let the width of the fracture planes and the porous block diameter be in the same order. If permeability ratio of matrix blocks to fracture planes is of order ε2, microscopic models for two-phase, incompressible, immiscible flow in fractured media converge to a dual-porosity model as ε goes to 0. If the ratio is smaller than order ε2, the microscopic models approach a single-porosity model for fracture flow. If the ratio is greater than order ε2, then microscopic models tend to another type of single-porosity model. In this work, these results will be proved by a two-scale method.

Multiscale mimetic method for two-phase flow in fractured media using embedded discrete fracture model

2017 ◽  
Vol 107 ◽  
pp. 180-190 ◽  
Author(s):  
Qingfu Zhang ◽  
Zhaoqin Huang ◽  
Jun Yao ◽  
Yueying Wang ◽  
Yang Li
Keyword(s):  
Two Phase Flow ◽  
Fractured Media ◽  
Fracture Model ◽  
Phase Flow ◽  
Two Phase ◽  
Discrete Fracture Model ◽  
Discrete Fracture

An Experimental Investigation of Pure-Substance, Adiabatic Two-Phase Flow in a Vertical Pipe

1994 ◽  
Vol 116 (1) ◽  
pp. 22-32
Author(s):  
D. E. Nikitopoulos ◽  
P. F. Maeder
Keyword(s):  
Kinetic Energy ◽  
Phase Change ◽  
Two Phase Flow ◽  
Pure Substance ◽  
Phase Flow ◽  
Two Phase ◽  
Limited Length ◽  
High Vapor ◽  
High Phase

Measurements of pressure drop, temperture, and average void fraction are presented for adiabatic, vertical-upwards, two-phase flow of Refrigerant 114 in a pipe. An experimental method has been developed according to which the evolution of flow states occurring in long pipes can be realized in a test section of limited length. The experiments cover the range of the flow from flashing to near choking. The measurements indicate existence of macroscopic thermodynamic equilibrium, except in the immediate neighborhood of flashing. Compressibility due to phase change is shown to play a very important role in the development of the flow. Three regions are recognized based on the measured energetics of the flow. Each region is dominated by potential energy changes, dissipation, and kinetic energy changes, respectively. The evolution of the flow is governed by hydrostatic effects in the initial region after flashing and by high, phase-change-induced kinetic energy increases far downstream as the flow approaches choking. In the intermediate region, viscous, inertial and gravitational effects play a role of comparable importance. The interfacial and wall shear forces have also been calculated from the measurements. The former dominate the initial regions of the flow, while the latter are strongest at high vapor contents.

scholarly journals A Semianalytical Two-Phase Imbibition Model in Dual-Porosity and Dual-Permeability Reservoirs

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Mengmeng Li ◽  
Gang Bi ◽  
Jie Zhan ◽  
Liangbin Dou ◽  
Hailong Xu
Keyword(s):  
Single Phase ◽  
Two Phase Flow ◽  
Transient Behavior ◽  
Dual Porosity ◽  
Test Model ◽  
Phase Flow ◽  
Fracture System ◽  
Two Phase ◽  
Pressure Transient ◽  
Water Imbibition

The pressure transient behavior of water injection well has been extensively investigated under single-phase flow conditions. However, when water is injected into formation, there are saturation gradients within the water flooded area. Additionally, water imbibition is essentially important for oil displacement in dual-porosity and dual-permeability (DPDP) reservoirs. In this work, a novel semianalytical two-phase flow DPDP well test model considering both saturation gradient and water imbibition has been developed. The model was solved by the Laplace transform finite difference method. Type curves were generated, and flow regimes were identified by the model. The model features and effect of parameters were analyzed. Results show that water imbibition reduces the advancing speed of water drive front in the fracture system and slows down the water cut raising rate and the expansion speed of the two-phase zone in the fracture system. Therefore, the fluid exchange between the fracture and matrix systems becomes more sufficient and more oil will be recovered from the DPDP reservoir. The shape of pressure curves is similar for the single-phase and two-phase flow DPDP model, but the position of the proposed model is above the curves of the single-phase model. Shape factor mainly influences the interporosity period of the pressure derivatives. Water imbibition has a major effect on the whole system radial flow period of the curves. The findings of this study can help for better understanding of the oil/water two-phase flow pressure transient behavior in DPDP reservoirs considering saturation gradients and water imbibition.

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