公司行政员生井治说，事发三天前，加藤在汽配厂大发脾气。

Three days before the attack, Kato lost his temper at the auto parts factory, company executive Osamu Namai said.

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生井说加藤是一个工作很认真的人，从来没有给公司制造过任何麻烦。

Namai added that Kato was a "very serious" worker and had not stood out as a troublemaker.

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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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