混合经济制度
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The surfactant and polymer mixed system slug is well on recovery ratio but the additional cost of ton oil is higher, economic benefit is not satisfactory.
而注表面活性剂和聚合物的复配体系段塞后热水驱虽然提高采收率幅度较大,但吨油新增成本较高,经济上不合理。
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