In delivery layers, the efforts driving hydrocarbon are mainly buoyancy and capillary force, and caprock plays an role of capillary resistance.
在运载层中推动油气运动的作用力主要是浮力和毛细管力，而盖层则起着毛细管阻力作用。
2
The surface tension, arc blow force and electromagnetic force work positive to improve the penetration, and the buoyancy can increase the width in the middle of weld pool.
表面张力、电弧吹力和电磁搅拌力均有利于获得较大的熔深，浮力有利于增加焊缝中间部位的宽度。
3
This paper presents the calculation method of external loadings for offshore drilling platforms induced by gravity, buoyancy, wind, wave, current and seismic force, and relative computer programs.