Two dimensional non equilibrium sorption pseudosteadystate model of coalbed methane for vertical well is derived in combination of an American model with the filed situation.
借鉴美国现有模型，结合我国现场实际情况，建立了二维煤层气垂直井的非平衡拟稳态井底渗流数学模型。
2
The relationship of the Pseudo—steady—state stage is derived and judging methods are presented in this paper.
本文对拟稳定阶段关系式进行了系统推导，并提出了判断拟稳定阶段的不同方法。
3
Then from the expression of gas well deliverability in pseudo-steadystate flow, there can have the expression of gas PI with and without high speed non-Darcy percolation.