MEASURING MULTI-LEVER DEVICE OF DOWNHOLE INSTRUMENT Russian patent published in 2011 - IPC E21B47/00 

FIELD: mining.

SUBSTANCE: measuring multi-lever device of downhole instrument includes a system of extension measurement levers with hinged joints and a row of measurement sensors located at specified levers. Sensors have wire electric connection to registration system arranged in specified body. With their ends levers are hingedly joined to bushings installed at specified body with the possibility of rotation relative to it. One of bushings is arranged with inner circular bore, to form a tight space when assembled with wall of specified body, and the space is filled with electrically non-conducting fluid and contains contact pairs of multi-ring collector. Collector provides for electric connection between measurement sensors at specified levers and registering system in specified body. Row of ring brushes of multi-ring collector, from which electric wires enter inside body of downhole instrument and are electrically connected to registering system, is fixed on specified body inside circular bore. And row of movable ring brushes of multi-ring collector, from which electric terminals pass towards measurement sensors installed at specified levers, is fixed inside ring bore on rotary bushing with the help of fixator and also covers a row of ring brushes installed on specified body, to form sliding electric contacts of multi-ring collector. Electroconductive connection of ring brushes in multi-ring collector installed on body of downhole instrument, with electric wires passing inside specified body, and electroconductive connection of ring brushes of multi-ring collector installed on rotary bushing, with electric wires connected to measurement sensors, are executed via tight power points. Number of multi-ring collector rings is determined by number of measured parametres and supply channels of measurement sensors. Hinged joint of each measurement lever end on bushing, which does not have ring collector, may axially be displaced along bushing casing to provide for independent tracking of well wall profile change by each measurement lever.

EFFECT: increased reliability of structure, namely, provision of uninterrupted electric connection of external measurement sensors arranged on measurement levers with registering system installed in body of downhole instrument, when wells are investigated under complicated geological and technical conditions.

9 cl, 4 dwg