对油气躲已经存在的伤害，实施油层伤害解除技术。
To the reservoir that damage has existed, some release technologies are applied.
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。
What is worse, sand particles may even flow back into the formation to cause damage.
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