特种油气藏2012，Vol.19Issue(3)：97-100,4.DOI:10.3969/j.issn.1006-6535.2012.03.025
低渗非达西煤层气井渗流数学模型建立与应用
Establishment and application of mathematical model for non-Darcy flow in low permeability coalbed methane wells
摘要
Abstract
Gas flow in low permeability coalbed methane reservoir has non-Darcy effect. Using conventional method to predict and calculate production tends to lead to error. In order to effectively tackle this problem, a mathematical model of gas/water two-phase flow has been established for low permeability coalbed methane reservoir by taking account of threshold pressure gradient effect. The model is solved by using finite difference method. A computer program is developed for numerical simulation of vertical CBM well productivity prediction. The impact of coal seam parameters on production is analyzed. The results show that in the process of CBM well production, there exists a stage during which gas production increases quickly and water production decreases quickly; the shorter the adsorption time is, the earlier the peak production is seen; the greater the threshold pressure gradient is, the faster the production decline is after peak production, and the lower the ultimate production is; CBM production of supersaturated adsorbed gas > saturated gas > undersaturated gas.关键词
煤层气藏/启动压力梯度/数学模型/产能预测/渗流数学模型Key words
coalbed methane/ threshold pressure gradient/ mathematical model/ productivity prediction/ percolation mathematical model分类
能源科技引用本文复制引用
陈建华,王新海,刘洋,成双华,吴剑..低渗非达西煤层气井渗流数学模型建立与应用[J].特种油气藏,2012,19(3):97-100,4.基金项目
国家油气重大科技专项“低渗、特低渗透油气田经济开发关键技术”(2011ZX013) （2011ZX013）
