Study on spectrum-based fatigue life direct calculation for spots of deep-water semi-submerged drilling unit;
深水半潜式钻井平台节点疲劳寿命谱分析研究；
The compressibility and the theory of Mohr-Coulomb Intensity limit equilibrium of soil, provides the basis for the self-rescue principle of rodless drilling unit.
土体的可压缩性和土的摩尔·库伦强度极限平衡理论为无钻杆钻具自救机理提供了理论依据。
Drilling unit has the functions including rapid falling, slow work-feeding and quick feeding back to improve working efficiency.
钻孔单元具有空行程快进，慢速工进和快速回程功能，提高工作效率。
Drilling unit has the functions including rapid falling, slow work-feeding and quick feeding back to improve working efficiency.
钻孔单元具有空行程快进，慢速工进和快速回程功能，提高工作效率。
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