The technology uses deep penetration perforation charge with high perforation density and large perforation diameter and surging perforation with greater pressure differential.

它采用高孔密大孔径深穿透射孔弹和大压差抽吸炮眼清洗技术，不仅能提高油井产能，解除近井带污染，还可以改善防砂完井效果。

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So choosing correct underbalance pressure differential is key factor for underbalance perforation design.

选取合适的负压值是负压设计的关键。

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Objective To discuss the clinical value of CEUS in diagnosis and differential diagnosis of gallbladder perforation with liver abscess.

目的探讨CEUS诊断和鉴别诊断胆囊穿孔伴肝脓肿的应用价值。

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