摘要
已有的煤层气渗流研究基于达西定律,而实验表明低渗透介质气体渗流为非线性流。采用实验、理论与计算相结合的方法建立低渗透孔隙-裂隙介质气体非线性渗流运动方程。实验结果表明,低渗透孔隙-裂隙介质气体渗流曲线是从较低压力梯度下的凹形曲线至较高压力梯度下的直线,是连续变化的曲线,直线延长线不通过坐标原点,存在拟启动压力梯度。根据该普遍特征,建立了非线性渗流运动方程。其参数量纲与物理意义清楚,运动方程计算的理论曲线与实验结果吻合很好,达西定律是运动方程的特例,运动方程可运用于低渗透孔隙-裂隙介质气体渗流理论及开发计算研究。
Existing researches on coal bed methane is based on Darey＇s law. But experiments show that gas flow in low permeability porous media is nonlinear. Methods of experiment, theory and calculation were used to establish a new nonlinear flow law. Experiment results of gas flow in low permeability pore-fissure media were analyzed. Universal characteristics of the flow were generalized. The relationship between flow velocity and pressure gradient is a continuous curve which changes from a hollow curve under a low pressure gradient to a line under a high pressure gradient. The line is extended but does not stretches to the origin so that a starting pressure gradient appears. A new law of nonlinear flow was established according to the characteristics. Dimension and physical meaning of parameters of the new law are clear. Resuits indicate that there is a good agreement between the new law and the experiment of gas flow in low permeability porefissure media. Darey＇s law is just a special case of the new law. The new law can be used in theoretical and practical research on the gas flow in low permeability pore-fissure media. It lays the foundations of researches on mechanisms of coalbed gas flow and provides development of coal-bed gas resources with new basis.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2006年第4期1-4,共4页
Journal of Sichuan University (Engineering Science Edition)
基金
国家973资助项目(2002CB211700
2002CB412700)
国家自然科学基金资助项目(40202036
40572163)
四川省青年科技基金资助项目(05ZQ026-043)
地质灾害防治与地质环境保护国家专业实验室科学基金资助项目
中国博士后科学基金资助项目(第35批)
