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For the oil well where sand has been produced, we may squeeze the slurry into high permeable sand after sand plug is cleaned out. 對於已經出砂的油井，也可以在清洗砂堵後將高滲透水泥漿擠入高滲砂層，待其凝固後形成高滲透性人工屏障進行後期防砂。