观察了颗粒在不同倾斜角度的井筒中的运移方式，测定了不同粒径的砂粒被携带出的临界流量，揭示了颗粒直径同流体流量关系变化规律。
The critical flow rates of sand grains with different size migrated from the sand-carrying pipe with different Angle of inclination were measured.
观察了颗粒在不同倾斜角度的井筒中的运移方式，测定了不同粒径的砂粒被携带出的临界流量，揭示了颗粒直径同流体流量关系变化规律。
The critical flow rates of sand grains with different size migrated from the sand-carrying pipe with different Angle of inclination were measured.
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