2. It conforms to the linear seepage motion equation.
3. Gas is an ideal compressible gas.
4. Ignore the compressibility of rock and regard porosity as a constant.
5. The seepage process is isothermal. The above formula becomes a mathematical model of stable gas seepage: in unstable gas seepage, the relationship between pressure gradient and seepage velocity is often not linear, that is, non-Darcy seepage occurs.
Teaching reflection on finding the greatest common factor 1
In Teaching Example 3, square pieces of paper with side l