摘要
为了模拟瓦斯解吸引起的煤基质收缩对煤层瓦斯抽放的影响,采用数值计算方法建立了考虑瓦斯解吸影响的煤岩渗流应力耦合数学模型。并对Seidle模型不考虑有效应力对渗透率影响的缺陷提出了改进,开发了相应的数值计算程序,并对数值计算程序的可靠性做了验证。数值算例按考虑和不考虑瓦斯解吸影响两种工况分析了一个试井的瓦斯抽放过程,结果表明:瓦斯解吸诱发的煤基质收缩会较大提高煤岩的渗透率,在瓦斯抽放数值计算中应予以考虑;建立的改进Seidle模型能很好地模拟有效应力和瓦斯解吸对煤岩渗透率的影响。
In order to simulate the effect of desorption-induced shrinkage on gas flow, the seepage-stress coupled model with desorption-induced shrinkage was presented.aiming at the defect of Seidle model in which the effective stress＇ effect was ignored, the improved Seidle model with the effects including desorption-induced shrinkage and effective stress was presented. Then based on the improved Seidle model and the coupling thoery of gas flow and mechanism, the seepage-stress coupled model was presented and the correspond numerous code was developed. A gas well was studied in a numerical example with desortion effect and without desorption effect. The results show as follows： the permeability greatly is enhanced by desorption-induced shfingkage, which should be taken into account. The improved Seidle model can simulate the effects of effective stress and gas desortion on permeability.
出处
《辽宁工程技术大学学报（自然科学版）》
CAS
北大核心
2010年第4期533-536,共4页
Journal of Liaoning Technical University (Natural Science)
基金
河北省自然科学基金资助项目(E2010000872)
河北省教育厅基金资助项目(Z2009315)
建设部基金资助项目(2010-k2-15)
