Dissertation > Excellent graduate degree dissertation topics show

Microscopic Seepage Mechanism Research for Fractured Porous Media

Author: HeYaoYao
Tutor: LiuJianJun
School: Wuhan Polytechnic University
Course: Geotechnical Engineering
Keywords: fractured porous media equivalent permeability microscopic seepage numerical simulation
CLC: P618.13
Type: Master's thesis
Year: 2010
Downloads: 184
Quote: 0
Read: Download Dissertation

Abstract


Fractured porous media is the main reservoir to storage and transport for oil, gas, and coal bed methane. For low-permeability oil and gas reservoir rocks, the pore is the main oil storage, and fracture is the main channel of oil and gas migration. On coal and rock mass, the pore is the main storage space for coal-bed methane, and fracture is the main channel for coal bed methane migration. Therefore, the distribution and shape of fractures and pores has an important influence on the development of low permeability reservoirs and the exploitation of coal-bed methane.The Influence of permeability on porosity, crack width and crack angle is discussed at meso-scale in this paper. Firstly, the microscopic physical models were established about fractured porous media with different porosity, crack width and crack angle. Secondly,in the platform of COMSOL Multiphysics, making fluid mechanics and hydrodynamics combined,changes in porosity, crack width and crack angle due to simulated the change regularity of equivalent permeability in media under different pressure gradient, therefore, an empirical formula for equivalent permeability was derived as pressure gradient, porosity, crack width and crack angle were variables. Finally, analysis of its microscopic vacuity and parameters in SEM images of authentic coal rocks, its equivalent permeability were calculated with empirical formula established. According to compare of calculation permeability and experiment permeability, the parameter of the empirical formula was calibrated. The main work of the thesis and achievement are summed up as follows:(1) Research on meso-structure of fractured porous media, the mathematical model of fractured porous media is established and the four main factors were found which impacted fracture porous media fluid flow. (2) The basic assumptions are established to determine general fluid flow equations in the fracture system and pore system. As the fracture is the main flow channel and the pore is the main storage medium, the control equation in fracture system is the Navier-Stokes equations and in pore system is the Darcy’s law.(3) The experiment was designed according to four factors and four levels orthogonal table, obtained the most influential factors and the stability levels for numerical simulation to improve the accuracy of the data.(4) Used large-scale finite element analysis software COMSOL Multiphysics, obtained flow through the different fractured porous media on different factors and levels. Conversion by Darcy’s law, gives a different permeability. Therefore, the relationships between the equivalent permeability and each impact are obtained. Considering the integrated effect, the fitting equation obtained among the equivalent permeability and three affecting factors, finally.(5) After analyzing and processing scanning electron microscopy image, then import the pictures to COMSOL Multiphysics, a new model obtained from real fracture porous media. By solving the model, the ideal state of the model to calculate the formula was amended to make theory more realistic.

Related Dissertations

  1. The Setting Bases of Working Pressure in LNG Systems and Orthogonal Experiment Design of Heat Exchangers,TQ051.5
  2. Study on Springback of High-Strength Steel Stamping,TG386
  3. Numerical Simulation and Experiment on Hydroforming of Cups with Controllable Radial Pressure,TG386
  4. Research on Technology and Mechanism of Joining Cemented Carbide to Carbon Steel,TG454
  5. Numerical Simulation of Film Cooling in Turbine Cascade with Non-Axisymmetric Endwall Method,V231.3
  6. High Speed Aerodynamic Convection and Coupled Heat Transfer of Complicated Bodies,V215.4
  7. The Analysis on Characteris of Vibration Source about Vertical Vibration of Surrounding Environment Induced by Rail Transit,U211.3
  8. Study on the Heat Transfer Characteristics of Particle Cluster in Circulating Fluidized Bed,TK124
  9. Numerical Simulation of SNCR Process of a 600MW Utility Boiler,TK222
  10. Numerical Simulation of Biomass Direct Reburning,TK16
  11. Numerical Simulation on Pulverized Coal Combustion Process in a 670T/H Tangential Firing Furnace,TK224.11
  12. Numerical Simulation on the Combustion Process in the Furnace of a 1000MW Lignite-Fired USC Boiler,TK224.11
  13. Study on Gas-Solid Two-Phase Flow in Spouted Beds,TK173
  14. Experimental Study and Numerical Simulation on Aerodynamic Field of Tangential Bias Swirl Burner,TK223.23
  15. Characteristic Study of Combustion in Central Reverse Flame Chamber,TK223.21
  16. Numerical Simulation and Contrastive Analysis of Labyrinth Seals and Leaf Seals,TK263.2
  17. Numerical Study on Phosphorus Distribution in Water Environment of the Three Gorges Reservoir,X832
  18. The Design and Performance Simulation of External Valve Small Displacement Pump,TE933.3
  19. Analysis of the Impact of Tailings Dam Stability under Seepage Role,TV649
  20. Study on Hydraulic Fracturing of Low Permeability Reservoir,P618.13
  21. Numerical Simulation and Experimental Study of Air-Assisted Sprayer of Orchard,S491

CLC: > Astronomy,Earth Sciences > Geology > Of ore deposits > Deposit classification > Fuel deposits > Oil, natural gas
© 2012 www.DissertationTopic.Net  Mobile