FIELD: oil-and-gas production.
SUBSTANCE: device contains casing, thrust unit and gaging unit with displacement pickup, located in casing sequentially, and controller, connected to gaging unit by conductor cable. Thrust unit consists of pivotally connected to each other measuring and thrust levers, tightened by spring. Free ends of thrust and measuring levers are connected to casing pivotally, and free end of measuring lever herewith - with ability of restricted axial movement in two longitudinal side grooves of casing. Nozzle of displacement pickup constantly interacts to free end of measuring lever.
EFFECT: reliability enhancement of its operation ensured by design simplification, removing of radial and axial clearances of thrust unit, oproviding of reliable contact of the device to the wellbore wall.
4 dwg
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