... 井身结构wellbore configuration 井下安全downhole safety 井下复杂情况down hole problem ...
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井下安全阀 [油气] subsurface safety valve ; SCSSV ; SSSV ; DHSV
地面控制井下安全阀 surface controlled subsurface safety valve ; SCSSV
井下控制井下安全阀 subsurface controlled subsurface safety valve ; SSCSSV
地面控制的井下安全阀 SCSSV
煤矿井下安全标志 Coal mine underground safety signs
矿井井下安全 underground miners safey
强行打开井下安全阀 Open SSSV by Force
井下安全阀系统 Subsurface safety valve systems
单线控制井下安全阀 single-line subsurface safety valve
该问题直接涉及井下安全和钻井效率，必须予以高度重视。
Such problems must be highlighted because they are directly related to downhole safety and drilling efficiency.
实际测试表明，在给井下安全作业带来了可靠保证的同时，节电效果明显。
The practical testing indicates that the system has an evident electricity-saving effect while ensuring a safe underground operation.
改造后的液压支架性能良好，效果显著，为井下安全生产起到了积极的作用。
The hydraulic support, which performs well after the transformation, plays an active role in the safety in underground production.
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