首页>
外国专利>
Core sample taking unit lowered in drilling string - has telescopic core barrel extended by mud pressure on piston of barrel inside unit
Core sample taking unit lowered in drilling string - has telescopic core barrel extended by mud pressure on piston of barrel inside unit
展开▼
机译:岩心取样装置降低到钻柱中-伸缩式岩心筒通过泥浆在装置内部的筒体活塞上的压力而延伸
展开▼
页面导航
摘要
著录项
相似文献
摘要
Unit comprises a cylindrical tube lowered down the string and contg. a sampling barrel and sealing means to prevent entry of drilling mud into the annular space between tube and string and act as stop for the tube. Means are provided which telescopically extend the barrel below the lower end of the string under the action of mud pressure to take a core sample. Pref. tube has a closed upper end with ducts for pressurising its interior, a cable coupling and an external ring to centralise it in the drilling string which may have a bit at its lower end.
展开▼