[ China Instrument Network Instrument Development ] The permeability of porous media is one of the important parameters of the fluid movement state inside the reaction material. The accurate measurement of its size is important in petroleum, unconventional natural gas, underground nuclear waste disposal, environmental groundwater protection and other projects. Application, measuring permeability quickly and accurately is a very important test technique.
Consider the numerical solution of porosity and the analytical solution without considering porosity
Among the many permeability measurement methods, the steady-state method is the most widely used, but because the measurement period is too long, it is not suitable for the permeability evaluation of low-permeability medium, which promotes the development of transient method. Different scholars have proposed different measurement and data processing methods for transient methods, including single pulse method, interval pulse method, and periodic method. Transient method can greatly improve the efficiency of permeability measurement of low permeability medium, and its data is more abundant, and it can also respond to the pore size inside porous medium. However, the research on the theoretical solution and trial situation of different methods is not detailed. The lack of media pore volume on the different forms of the single pulse method and the influence of the periodic method are also lacking in the complete processing technology of the data.
Researchers of the Institute of Rock and Soil Mechanics of the Chinese Academy of Sciences, Yang Diansen and Chen Weizhong, have been working on the theory and technology of porous media fluid transport including porous media permeability measurement and hydraulic fracturing, for various measurement methods. The theoretical methods are deduced and solved in detail, and the important parameters are discussed. Especially, the influence of effective porosity on fluid pressure transmission is analyzed in the form of numerical simulation, which reveals the shortcomings of theoretical solutions. The interpretation of the test phenomenon is met. Aiming at the conventional form of the pulse method, a method for solving the porosity by using the pressure curve is proposed. For the periodic method, the theoretical form of solving the porosity is proposed by using the concept of the medium gas storage coefficient.
The research was supported by the National Key Basic Research Development Program and the National Natural Science Foundation. The results were published in the Journal of Rock Mechanics and Geotechnical Engineering.
(Original title: Research progress on the measurement method of low permeability porous media permeability in Wuhan Institute of Geotechnical Engineering)
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