DEVICE FOR CONTINUOUS CORING FROM SEA BOTTOM Russian patent published in 1998 - IPC

FIELD: coring. SUBSTANCE: the offered device includes turbodrill with hollow axle connected by means of threaded sub to bottom pipe of drill pipe string. Located in hollow axle of turbodrill below flushing ports is removable core receiver. Rotor-body position is fixed on axle with the help of radial bearings and axial bearing. Rotor-body accommodates fixed two types of turbine: upper and lower. Lower turbine is located under hollow found between turbines. Upper turbine serving as seal is located above interturbine hollow. Interturbine hollow is hydraulically communicated with axle hollow. Inlet edges of upper turbine blades are thin and outlet edges are thick and undercut in plane perpendicular to turbodrill axis. Fitted on body nipple collar is flywheel whose periphery and lower working surface are hard-faces with wear-resistant inserts. Attached to body nipple by means of thread is diamond core drilling bit. EFFECT: reliable coring under conditions of bottom streams and irrespective of profile of sea bottom. 2 cl, 5 dwg