During and after acid treatment, the end of tube strain must locate over the main production layer.

气井酸化时及酸化后，试采管串底界应位于主产层上方；

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There are many conflicts between safe of well controlling, finding production layer and protecting reservoirs.

因工艺不完善井控工作具有较大的盲目性，井控安全与产层发现、保护存在许多矛盾。

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Qum Formatiom with carbonate is mainly exploration aim stratum, the C4 member of Qum Formatiom is mainly production layer.

库姆组碳酸盐岩为主要勘探目的层，其中库姆组c 4段为主要产层。

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The Montreal Protocol is the international agreement designed to protect the ozone layer by phasing out production of Cfc's and halons.

BBC: News | Sci/Tech | Ozone hole reaches record size

But if doctors can preserve remaining insulin production in their new patients, they might someday be able to layer on other drugs that would prod the insulin-producing cells to slowly regenerate.

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