DRILLING SAMPLING PERFORATOR Russian patent published in 2001 - IPC

FIELD: geophysical equipment, particularly, means for perforation and taking samples from well walls. SUBSTANCE: drilling sampling perforator includes connecting cable head, pressure compensator, body accommodating electric motor, double planetary reducing gear and turning mechanism. Mounted in case is hydraulic drive, pressing lever and extensible drill. Turning mechanism is located on hollow shaft of the second stage of planetary reducing gear and found in hollow formed by body and case movably connected with each other. Shaft of the second stage of reducing gear has two jaw half-couplings spring-loaded in axial direction. One of them has internal splines engaged with respective splines on shaft external surface. The other half-coupling has radial tenons conjugated with body recesses movably in axial direction, and mating ratchet teeth are located on case shoulders and body partition, respectively. Height of ratchet teeth on body partition is larger than that of teeth on case shoulders. EFFECT: higher operating reliability of device capable of performance in one diametrical plane of well of preset number of cycles of drilling or sample taking. 2 dwg