The article was illustrated to make welders understand the general knowledge of plasma cutting and improve the perfo…
最大限度地帮助焊工理解等离子切割常识，提高切割效果。
Perfo Frac is a new technique which combines perforation with high energy gas fracturing to improve near wellbore zone.
复合射孔是射孔和高能气体压裂相结合对近井地层进行改造的一项新技术。
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