泄漏天然气在圆管土壤柱中的渗流实验研究

Experimental Study on Seepage of Leaked Natural Gas in Circular Pipe Soil Column

基于达西渗流实验,利用自主设计的实验装置进行了泄漏天然气在圆管土壤柱中的渗流实验,对所得渗流速度vg和压差Δp数据进行曲线拟合。研究表明:通过拟合实验数据可得出泄漏天然气在土壤中渗流的粘性阻力系数和惯性阻力系数。天然气在圆管土壤柱中的渗流规律与达西实验结果并不完全吻合。在一定的土壤孔隙率、渗流方向、土壤厚度条件下,Δp0. 5与vg成正比例关系,进一步得到有天然气渗透系数的改进达西公式。土壤类型和渗流方向对天然气泄漏扩散有重要影响,土壤孔隙率越大,渗透系数越大,渗透能力越强,单位时间在土壤中扩散范围越大。对于孔隙率不随渗流方向改变的情况下,天然气在竖直方向上的渗透系数大于水平方向。

Based on the Darcy seepage experiment,the seepage experiment of the leaked natural gas in the circular pipe soil column is carried out by the experimental device designed by ourselves,and the curve fitting of the obtained data of seepage velocity vg and pressure differenceΔp are performed.The research shows that the viscous drag coefficient and the inertia drag coefficient of the seepage of the leaked natural gas in the soil can be obtained by fitting the experimental data.The seepage law of natural gas in the circular pipe soil column is not completely consistent with the results of the Darcy experiment.Under certain conditions of soil porosity,seepage direction and soil thickness,Δp 0.5 is proportional to vg,and an improved Darcy formula with natural gas permeability coefficient is obtained.Soil type and seepage direction have an important influence on natural gas leakage and diffusion.The larger the soil porosity,the larger the permeability coefficient,the stronger the permeability ability,and the larger the diffusion range per unit time in the soil.For the case where the porosity does not change with the seepage direction,the permeability coefficient of natural gas in the vertical direction is greater than that in the horizontal direction.