井中测定流速广义示踪稀释物理模型

Generalized physical model of tracer dilution for measuring seepage velocity in well

建立了存在垂向流条件下广义的井中示踪剂稀释物理模型。当井或孔所揭露的含水层中存在垂向流时 ,可分为 3种情况 :即经过含水层的垂向流量沿程不变、增加或减少。物理模型在稳定流场及垂向流量不随时间变化的条件下 ,考虑了这 3种不同的情况 ,事实上进入到稀释水柱的水为水平流和垂向流两种不同来源水的混合 ,据此建立了相应的数学方程并求出解。应用广义示踪剂稀释模型可以在存在垂向流的条件下测定水平渗透流速 ,并对各种情况下误差产生的原因进行了详细的讨论。

A generalized physical model of tracer dilution for measuring seepage velocity in well having vertical flow is established.In the model three probable cases are to be considered:the vertical flow keeps constant in the flow path,the vertical flow trends to increase or trends to decrease.Under the condition of the fluid field is stable and vertical flow is steady the dilution volume is the blend of horizontal flow and vertical flow.Based on this concept the corresponding equation is established and solved.By means of this model the horizontal seepage flow velocity can be measured even if the vertical flow exists.The engineering practice shows that the precision of this method is higher than that of point model of tracer dilution.