At present, blowout prevention system mainly includes wellhead BOP stack and blowout prevention tools in drill strings.
目前，防喷系统主要包括井口防喷器组合和钻柱内防喷工具。
Drill string vibration of deep Wells is studied in the article. The axial vibration, lateral vibration and torsional vibration of drill strings are analyzed.
文章研究深井钻柱的振动问题，以深井钻柱为研究对象，分析研究了钻柱的纵向振动、横向振动及扭转振动。
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