充填效率随携砂液中砾石浓度、滤失量及砾石直径的增加而降低。
The packing efficiency decreases with the increase of gravel concentration in injected liquid, fluid loss to formation and gravel size.
双层管柱提供了新的液流通道，同时加快了携砂液返速，提高冲砂效率。
Dual string provides a new fluid circulation way and accelerates the velocity of liquid quickly, improving the efficiency.
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