In view of the narrow pore and throat and complex pore structure characteristics of low permeability reservoir, one-dimensional microtubes with inner diameters of 20, 15 and 10 μm are used to study the dynamic mechanism of fluid flow in microtubes. The relationship between flow velocity and pressure gradient are analyzed using nano-micron polymer as mobile media. Meanwhile, the flow mechanism of polymer nano-micron under microscale effect in the narrow throats are investigated, and the micro force and dynamic characteristic in the microtubes are revealed. The research shows that with the decrease of the microtube diameter, or the increase of nanopolymer particle size and solution concentration, the fluid flow velocity will decrease. The flow velocity of fluid in the microtube is propotional to the pressure gradient, but the nonlinear fluid flow characteristic will gradually stand up with the decrease of microtube diameter or the increase of nano-polymer particle size.

low permeability  /  microtubes  /  micro flow  /  nano-micron polymer