DOWNHOLE DRIVING UNIT HAVING HYDRAULIC MOTOR WITH PLANETARY GEARING SYSTEM Russian patent published in 2016 - IPC E21B23/14 E21B4/04 

FIELD: mining.

SUBSTANCE: group of inventions relates to mining and can be used for delivery of working tool at well bottom. Downhole driving unit comprising a driving unit housing, a hydraulic motor comprising a hydraulic motor housing, a wheel assembly comprising a stationary part and a rotational part. Stationary part is connected with driving unit housing and is rotatably connected with rotational part. Wheel assembly comprises a wheel ring for contacting an inner wall in well and connected with or forming part of rotational part. Wheel assembly further comprises a hydraulic motor so that stationary part and rotational part constitute hydraulic motor housing. Hydraulic motor comprises a rotatable section connected with rotational part for rotating part of wheel assembly. Furthermore, wheel assembly comprises a planetary gearing system comprised in hydraulic motor housing. Hydraulic motor comprises a rotatable section driving wheel ring through planetary gearing system. Invention also relates to a downhole system comprising driving unit and to use of such driving unit.

EFFECT: technical result consists in improvement of reliability of downhole drive unit.

20 cl, 17 dwg