GEAR FOR INJECTION OF INDICATOR FLUID INTO WELL Russian patent published in 2000 - IPC

FIELD: gas and oil production, geophysical instrumentation, study of fluidodynamics. SUBSTANCE: gear includes two units: upper fixation unit and lower unloading unit. Fixation and separation unit has cylindrical body and four sets of lever mechanisms mounted radially with respect to axis of well. Each set installed in grooves of cylindrical body has external levers spring-loaded with plate spring, center levers and cams kinematically coupled one to another and put on axis of rod passing through all units that is enveloped by upper expanding cone. Unloading unit has cylindrical body housing two mechanisms. Upper collet mechanism includes upper seal made fast to collet fixing upper expanding cone by circular boss. Upper seal is coupled to body with the use of cutting member. Lower piston mechanism has hollow piston made fast to rod above which lower expanding cone embracing rod is mounted. Hollow piston includes separation plug put into axial duct space above which hydraulically communicates by means of two radial ducts to space of body between upper and lower seals. Lower seal has holes for communication of hollow piston with external medium. Cylindrical body has radial ducts. EFFECT: increased operational reliability of structure and efficiency of removal of indicator fluid. 3 dwg