DEVICE FOR RUNNING OF INSTRUMENTS INTO WELL HIGH WELLHEAD PRESSURE Russian patent published in 1995 - IPC

FIELD: geophysical and hydrodynamic investigations of operating wells. SUBSTANCE: device for running of instruments into well with high wellhead pressure has lubricator with preventor installed in its lower part in wellhead. Preventor has body accommodating rams and unit for equalizing pressure in lubricator and well hollows, ram interlocking units, each of which is made in form of retainer, unit of plate with chamber accommodating differential piston which separates chamber into rod end and rodless end. Differential piston is spring-loaded from the side of rod end relative to port made in body. Piston rod is kinematically connected with retainer installed so as to ensure its passage through ports into sockets made in rams. Rod and rodless ends are communicated through dividers and body channels with lubricator hollow and well hollow. Piston is provided with position indicator located in rodless end for its appearance on the external surface of plate. EFFECT: higher efficiency. 2 cl, 2 dwg