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Study On Seepage Numerical Simulation Of Coal Methane In Qinshui Basin With Low Permeability

Posted on:2009-01-04Degree:MasterType:Thesis
Country:ChinaCandidate:J ZhaoFull Text:PDF
GTID:2120360275473332Subject:Engineering Mechanics
Abstract/Summary:PDF Full Text Request
Coalbed methane which can replace natural gas is a kind of efficient and clean energy source. Exploiting and using coalbed methane have an important significance for making full use of clean energy source, improving the condition of coal mine production and protecting atmospheric environment that people survive in.Our country is rich in coalbed methane source. However, because coalbed methane reservoir is complex, permeability is low and coal-seam gas seepage velocity is slow, classical percolation theory is not suitable for complex flowing law.On the basis of the domestic and abroad literatures researches, the mechanisms of the storing; migrating and producing for coalbed methane and the complex exploiting procedure of coalbed methane are analyzed, especially the situation of low permeability in our country is considered, a dual-porosity, fluid-solid coupling model for simulating methane producing process is developed. This model introduced the Langmuir isothermal absorption theory, the first Fick theory to consider the absorption and diffusion of coalbed methane. Then, this complex mathematical model is approximated and solved by IMPES (Implicit pressure and explicit saturation method). Coalbed methane Simulation executable program is written through rewriting the black oil program-boast with FORTRAN source code. The data of coalbed methane wells of JinShi 1, which is located in 3# coal seam of Qinshui basin in Shanxi Province, was used to prove the reliability of this model. And this program is used for the history match and production trend forecasting of coalbed methane and water. Besides, under the low permeability condition, the affection of start-up pressure gradient to the production of coalbed methane well is considered. Thus, start-up pressure gradient is a significant factor for seepage numerical simulation of coal methane with low permeability. Besides, through analyzing the data, a software which compiled by Visual Basic were set up. And this is convenient for the drainage work of Qinshui basin.
Keywords/Search Tags:Coal Methane, Low Permeability, Fluid-solid Coupling, Numerical Simulation, Start-up Pressure Gradient, Water-yield Discipline, Drainage
PDF Full Text Request
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