Introduction II
By some means of modifications, we can use these ideas or theories for the gas flow.
Due to the obvious influence of compressibility of gas flow in the shale, the classical Darcy’s Law needs to be modified to adapt to the shale gas’s flow. Through some research, we’ve discovered that permeability coefficient k becomes bigger as we change liquid flow to gas flow. Then Klinkenberg defines that phenomenon by using the Knudsen number Kn dividing the gas flow into several kinds. Also, gas flow is associated with the flow equation. And as we all know, Darcy’s Law along with the equation of conservation of mass are equivalent to the underground fluid flow equation, one of the basic equations of hydrogeology. As for gas flow equations, we can use Knudsen number to divide the gas flow into several kinds, then in different kinds of flow we use different kinds of flow equations to describe it.
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Which part of production does the gas flow play an important role?
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Which part of production does the gas flow play an important role?
It is analogous to Fourier’s law in the field of heat conduction, Ohm’s law in the field of electrical networks, or Fick’s law in diffusion theory.
Darcy’s law is a phenomenologically derived constitutive equation that describes the flow of a fluid through a porous medium. The law was formulated by Henry Darcy based on the results of experiments on the flow of water through beds of sand.
One application of Darcy’s law is to water flow through an aquifer; Darcy’s law along with the equation of conservation of mass are equivalent to the Underground fluid flow equation, one of the basic relationships of hydrogeology. Darcy’s law is also used to describe oil, water, and gas flows through petroleum reservoirs.
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Group C (IRSMW, IGG, LCOGR)
Physics of Gas Flow (Page 5)
10th Juid flow (Gas is just one kind of fluid.) I
Darcy’s law II
It also forms the scientific basis of fluid permeability used in the earth sciences, particularly in hydrogeology ( hydraulic conductivity ).
First of all, we consider the classical theory of the fluid flow: Darcy’s Law. It’s the primal law of the fluid which is initially proved by the experiment done by H.P.G Darcy. It clearly illustrates seepage velocity v is in direct proportion to hydraulic gradient I. However, it just generally takes hydraulic conductivity K to manifest the different permeability of different materials. To get to know and control seepage fluid in detail, we need to find out what has influenced the K. There is a relation between permeability k and hydraulic conductivity K, we will explain it later, and for further research, we use the permeability k instead of hydraulic conductivity K which is more general.
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Introduction I
Research of gas flow in the shale is one of the most important part that leads us to a totally new epoch of shale revolution. Regarding shale gas as one kind of the various fluid, we use fluid mechanics methods to explore the world of shale gas, to reveal the mask of this mysterious new energy.
In the following, we’ll talk about all these things in detail.
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Group C (IRSMW, IGG, LCOGR)
This law is very important since it solves a lot of things concerning the fluid flow, and it is very similar to other laws in physics ( Considering the philosophy behind the sciences ).
Physics of Gas Flow
A Group C (Created by L TEX)
Institute of Rock and Soil Mechanics Institute of Geology and Geophysics Lanzhou Centre for Oil and Gas Resources
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Group C (IRSMW, IGG, LCOGR)
Physics of Gas Flow (Page 6)
10th July 2015