Oil soluble temporary plugging agent DGZ is a novel multiple functions reservoir protecting agent developed based on temporary shielding plugging theory.

DGZ油溶性暂堵剂是根据屏蔽暂堵原理开发的一种新型多功能油层保护剂。

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Using under balance pressure drilling technique aims at preventing the mud loss and pollution of Palaeozoic limestone reservoir in this area and therefore protecting oil reservoir.

该井四开钻探过程中成功地采用欠平衡钻井技术钻穿寒武系凤阳山组，以防止该区古生界灰岩储层发生井漏及储层污染，从而保护油层。

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A quantitative evaluation of beneficial result in conserving water and protecting soil erosion of froest in the upper stream of Miyun reservoir is produced from the information system.

利用该系统对密云水库上游密云县境内水源保护林的水源涵养与防止土壤侵蚀效益进行了定量评价。

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