要顺利钻穿盐膏层，首先在进行设计时就要考虑盐膏层的特点，科学合理地进行单井设计。

Successfully penetrating through gypsums require accounting for characteristics of gypsum formation at initial design phase, and scientifically and reasonably planning individual well.

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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。

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.

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