DEVICE FOR INVESTIGATION OF OPEN SHAFTS OF MULTIBRANCH HORIZONTAL WELLS Russian patent published in 2014 - IPC E21B47/01 

FIELD: oil and gas industry.

SUBSTANCE: device includes a string of hollow sealed pipes, which is lowered to a well, and a geophysical instrument providing performance of geophysical investigations. On the lower end of the hollow sealed pipe string there installed is a hydraulic diverter providing penetration into an open shaft of the multibranch horizontal well. The lower end of the hydraulic diverter is equipped with a stock and an easily-drilled broken-down nozzle with a calibrated hole; with that, the broken-down nozzle is fixed in an initial position with a shear pin with possibility of being destructed in the operating position with a forcing-through plug under action of excess pressure in the hollow sealed pipe string; the geophysical instrument is equipped with a stiff cable, by means of which the geophysical instrument is lowered from the well head to the pipe string.

EFFECT: performing selective geophysical investigations in open shafts of a multibranch horizontal well.

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