FIELD: mining.
SUBSTANCE: present invention relates to downhole driving unit (11) for insertion into a well, comprising driving unit housing (51), arm assembly (60) movable between a retracted position and a projecting position in relation to driving unit housing, arm activation assembly (41) arranged in driving unit housing for moving arm assembly between retracted position and projecting position and wheel assembly (90) comprising stationary part (91) and rotational part (92). Stationary part is connected with or forms part of arm assembly and is rotatably connected with a rotational part. Wheel assembly comprises a hydraulic motor comprising hydraulic motor housing (93) and rotary section (84) connected with rotational part for rotating part of wheel assembly. Also disclosed is a well system containing said drive and use of said drive unit.
EFFECT: high efficiency of downhole tool to displace working tool forward in all parts of well.
20 cl, 15 dwg
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