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two－phase flow FOR A HORIZONTAL WELL PENETRATING A NATURALLY FRACTURED RESERVOIR WITH EDGE WATER INJECTION

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Applied Mathematics and Mechanics(English Edition) 1995年第5期16卷 937-942页

作者：郭大立刘慈群 Southwest-China Petrolem Institute Sichuan P. R. China Institute of Porous flow and Fluid Mechanics Hebei P. R. China

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ＴＷＯ－ＰＨＡＳＥＦＬＯＷＦＯＲＡＨＯＲＩＺＯＮＴＡＬＷＥＬＬＰＥＮＥＴＲＡＴＩＮＧＡＮＡＴＵＲＡＬＬＹＦＲＡＣＴＵＲＥＤＲＥＳＥＲＶＯＩＲＷＩＴＨＥＤＧＥＷＡＴＥＲＩＮＪＥＣＴＩＯＮＧｕｏＤａｌｉ（郭大立）ＬｉｕＣｉｑｕｎ（刘慈群）（Ｒｅｃｅｉｖｅ...

关键词： horizontal well two-phase flow medium with double-porosity edge water injection characteristic method

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Comprehensive modeling of frictional pressure drop during carbon dioxide two-phase flow inside channels using intelligent and conventional methods

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Chinese Journal of Chemical Engineering 2023年第11期63卷 108-119页

作者： Mohammad Amin Moradkhani Seyyed Hossein Hosseini Mengjie Song Department of Chemical Engineering Ilam University69315-516 IlamIran Department of Energy and Power Engineering School of Mechanical EngineeringBeijing Institute of TechnologyBeijing 100081China

Environmentally friendly nature of CO_(2),associated with its safety and high efficiency,has made it a widely used working fluid in heat *** CO_(2)has strange thermophysical features,specific models are required to estimate its two-phase characteristics,particularly frictional pressure drop(FPD).Herein,a widespread dataset,comprising 1195 experimental samples for two-phase FPD of CO_(2)was adopted from 10 sources to fulfill this *** literature correlations failed to provide satisfactory precisions and exhibited the average absolute relative errors(AAREs)between 29.29% and 67.69% from the analyzed *** inspiring the theoretical method of Lockhart and Martinelli,three intelligent FPD models were presented,among which the Gaussian process regression approach surpassed the others with AARE and R^(2)values of 5.48% and 98.80%,respectively in the test stage.A novel simple correlation was also derived based on the least square fitting method,which yielded opportune predictions with AARE of 19.76% for all *** truthfulness of the newly proposed models was assessed through a variety of statistical and visual analyses,and the results affirmed their high reliability over a broad range of conditions,channel sizes and flow ***,the novel models performed favorably in describing the physical attitudes corresponding to two-phase FPD of CO_(2).Eventually,the importance of operating factors in controlling the FPD was discussed through a sensitivity analysis.

关键词： CO_(2) two-phase flow Frictional pressuredrop Intelligent approaches Correlation

MICROGRAVITY EXPERIMENTS OF two-phase flow PATTERNS ABOARD MIR SPACE STATION

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Acta Mechanica Sinica 2001年第2期17卷 151-159页

作者：赵建福解京昌林海胡文瑞 NMLC Institute of MechanicsChinese Academy of SciencesBeijing 100080China

A first experimental study on two-phase how patterns at a long-term, steady microgravity condition was conducted on board the Russian Space Station 'MIR' in August 1999. Carbogal and air are used as the liquid and the gas phase, respectively. Bubble, slug, slug-annular transitional, and annular hows are observed. A new region of annular how with lower liquid superficial velocity is discovered, and the region of the slug-annular transitional flow is wider than that observed by experiments on board the parabolic aircraft. The main patterns are bubble, slug-annular transitional and annular flows based on the experiments on board MIR space station. Some influences on the two-phase how patterns in the present experiments are discussed.

关键词： two-phase flow microgravity fluid physics space experiment

Pressure transient characteristics of non-uniform conductivity fractured wells in viscoelasticity polymer flooding based on oil-water two-phase flow

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Petroleum Science 2024年第1期21卷 343-351页

作者： Yang Wang Jia Zhang Shi-Long Yang Ze-Xuan Xu Shi-Qing Cheng National Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing102249China

Polymer flooding in fractured wells has been extensively applied in oilfields to enhance oil *** contrast to water,polymer solution exhibits non-Newtonian and nonlinear behavior such as effects of shear thinning and shear thickening,polymer convection,diffusion,adsorption retention,inaccessible pore volume and reduced effective ***,the flux density and fracture conductivity along the hydraulic fracture are generally non-uniform due to the effects of pressure distribution,formation damage,and proppant *** this paper,we present an oil-water two-phase flow model that captures these complex non-Newtonian and nonlinear behavior,and non-uniform fracture characteristics in fractured polymer *** hydraulic fracture is firstly divided into two parts:high-conductivity fracture near the wellbore and low-conductivity fracture in the far-wellbore section.A hybrid grid system,including perpendicular bisection(PEBI)and Cartesian grid,is applied to discrete the partial differential flow equations,and the local grid refinement method is applied in the near-wellbore region to accurately calculate the pressure distribution and shear rate of polymer *** combination of polymer behavior characterizations and numerical flow simulations are applied,resulting in the calculation for the distribution of water saturation,polymer concentration and reservoir *** with the polymer flooding well with uniform fracture conductivity,this non-uniform fracture conductivity model exhibits the larger pressure difference,and the shorter bilinear flow period due to the decrease of fracture flow ability in the far-wellbore *** field case of the fall-off test demonstrates that the proposed method characterizes fracture characteristics more accurately,and yields fracture half-lengths that better match engineering reality,enabling a quantitative segmented characterization of the near-wellbore section with high fracture conductivity and th

关键词： Polymer flooding Non-Newtonian fluid Non-uniform fracture conductivity two-phase flow Pressure transient analysis

INFLUENCE OF SURFACTANT ON two-phase flow REGIME AND PRESSURE DROP IN UPWARD INCLINED PIPES

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Journal of Hydrodynamics 2012年第1期24卷 39-49页

作者： XIA Guo-dong CHAI Lei Key Laboratory of Enhanced Heat Transfer and Energy Conservation Ministry of EducationCollege ofEnvironmental and Encrgy EngineeringBeijing University of TechnologyBeijing 100124China

The influence of a surfactant on the two-phase flow regime and the pressure drop in upward inclined pipes is investigated for various gas/liquid flow *** air/water and air/100 ppm sodium dodecyl sulphate aqueous solution are used as the working *** influence of the surfactant on the two-phase flow regime in upward inclined pipes is investigated using the electrical tomographic *** 0o,2.5o and 5o pipe inclinations,the surfactant has obvious effect on the transition from the stratified wavy flow to the annular flow,and the range of the stratified smooth flow regime is also extended to higher gas *** 10o pipe inclination,no stratified flow regime is observed in the air/water *** the air/surfactant solution system,however,the stratified flow regime can be found in the range of *** all inclination angles,the changes of the pressure gradient characteristics are accompanied with the flow pattern *** surfactant in a two-phase flow would reduce the pressure gradient significantly in the slug flow and annular flow *** the annular flow regime,the pressure gradient gradually becomes free of the influence of the upward inclined angle,and is only dependent on the property of the two-phase flow.

关键词： surfactant flow regime pressure drop two-phase flow

Liutex-based analysis of drag force and vortex in two-phase flow past 2-D square obstacle using LBM on GPU

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Journal of Hydrodynamics 2020年第5期32卷 820-833页

作者： Peng-xin Cheng Nan Gui Xing-tuan Yang Ji-yuan Tu Sheng-yao Jiang Hai-jun Jia Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy TechnologyKey Laboratory of Advanced Reactor Engineering and Safety of Ministry of EducationTsinghua UniversityBeijing 100084China School of Engineering RMIT UniversityMelbourneAustralia

The two-phase flow past a square is a ubiquitous phenomenon widely encountered in industries and engineering,where the interaction of disparate phases coupled with the influence of the solid is rather *** this context,the flow characteristics and the vortex field are investigated to reveal the mechanisms of the two-phase drag and the vortex *** lattice Boltzmann method(LBM)is utilized to study the multi-component two-phase *** computation implemented on the GPU is remarkably accelerated thanks to the natural parallelism of the *** process of the two-phase flow past a square is thoroughly *** drag and lift forces,including the total force and the components caused by the dispersed phase and the continuous phase,respectively,are obtained,and their variation mechanisms are ***,the vortex-identification approaches based on the Liutex as well as the traditional methods are *** relationship between the bubble breakup and coalescence processes and the extremums of different vortex identification variables is analyzed.

关键词： two-phase flow flow past a square lattice Boltzmann method(LBM) vortex identification Liutex two-phase drag

Multi-relaxation-time lattice Boltzmann front tracking method for two-phase flow with surface tension

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Chinese Physics B 2012年第12期21卷 310-316页

作者：谢海琼曾忠张良奇梁功有 Hiroshi Mizuseki Yoshiyuki Kawazoe Department of Engineering Mechanics Chongqing University State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University Institute for Materials Research Tohoku University

In this paper, an improved incompressible multi-relaxation-time lattice Boltzmann-front tracking approach is proposed to simulate two-phase flow with a sharp interface, where the surface tension is implemented. The lattice Boltzmann method is used to simulate the incompressible flow with a stationary Eulerian grid, an additional moving Lagrangian grid is adopted to track explicitly the motion of the interface, and an indicator function is introduced to update the fluid properties accurately. The interface is represented by using a four-order Lagrange polynomial through fitting a set of discrete marker points, and then the surface tension is directly computed by using the normal vector and curvature of the interface. two benchmark problems, including Laplace＇s law for a stationary bubble and the dispersion relation of the capillary wave between two fluids are conducted for validation. Excellent agreement is obtained between the numerical simulations and the theoretical results in the two cases.

关键词： lattice Boltzmann method multi-relaxation-time front tracking method surface ten- sion two-phase flow

Simulation of gas–liquid two-phase flow in a flow-focusing microchannel with the lattice Boltzmann method

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Chinese Physics B 2023年第11期32卷 527-536页

作者：冯凯杨刚张会臣 Naval Architecture and Ocean Engineering College Dalian Maritime UniversityDalian 116026China

A lattice Boltzmann method for gas–liquid two-phase flow involving non-Newtonian fluids is developed. Bubble formation in a flow-focusing microchannel is simulated by the method. The influences of flow rate ratio, surface tension,wetting properties, and rheological characteristics of the fluid on the two-phase flow are analyzed. The results indicate that the flow pattern transfers from slug flow to dry-plug flow with a sufficiently small capillary number. Due to the presence of three-phase contact lines, the contact angle has a more significant effect on the dry-plug flow pattern than on the slug flow pattern. The deformation of the front and rear meniscus of a bubble in the shear-thinning fluid can be explained by the variation of the capillary number. The reduced viscosity and increased contact angle are beneficial for the drag reduction in a microchannel. It also demonstrates the effectiveness of the current method to simulate the gas–liquid two-phase flow in a microchannel.

关键词： two-phase flow lattice Boltzmann method pressure drop flow-focusing microchannel

Relative permeability estimation of oil-water two-phase flow in shale reservoir

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Petroleum Science 2022年第3期19卷 1153-1164页

作者： Yu-Liang Su Ji-Long Xu Wen-Dong Wang Han Wang Shi-Yuan Zhan Key Laboratory of Unconventional Oil&Gas Development Ministry of EducationQingdao 266580ShandongChina School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580ShandongChina

Oil-water two-phase flow is ubiquitous in shale strata due to the existence of connate water and the injection of fracturing *** this work,we propose a relative permeability model based on a modified Hagen-Poiseuille(HP)equation and shale reconstruction *** proposed model can consider the nanoconfined effects(slip length and spatially varying viscosity),oil-water distribution,pore size distribution(PSD),total organic matter content(TOC),and *** results show that the increasing contact angles of organic matters(OM)and inorganic minerals(iOM)increase the relative permeability of both oil and *** the viscosity ratio increases,the relative permeability of oil phase increases while that of water phase decreases,due to the different water-oil *** effective permeability of both oil and water decreases with the increasing ***,the relative permeability of water phase increases while that of oil phase *** increasing number and decreasing deviation angle of micro-fracture increase the effective permeability of oil and ***,microfracture has a minor effect on relative *** model can help understand oil-water twophase flow in shale reservoirs and provide parameter characterization for reservoir numerical simulation.

关键词： Shale Relative permeability two-phase flow TOC Analytical model