Open flow potential will drop down with decline of formation pressure in a gas well.
随着气井地层压力的下降，其无阻流量相应降低。
Porous solid mass is an important material base in the formation of debris flow.
松散固体物质是泥石流形成的重要物质基础。
What is worse, sand particles may even flow back into the formation to cause damage.
更为严重的是，井底砂粒可能随冲砂液重新返入油层，并对油层造成伤害。
What is worse, sand particles may even flow back into the formation to cause damage.
更为严重的是，井底砂粒可能随冲砂液重新返入油层，并对油层造成伤害。
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