Patent ID: 9051802
Filing Date: 2015-06-09
Classification: B60K,B60Y,E21B

Abstract:
1. A hydraulic downhole driving unit for insertion into a well, comprising: a driving unit housing, a hydraulic motor comprising a hydraulic motor housing, and a wheel assembly comprising a stationary part and a rotational part, the stationary part being connected with the driving unit housing and being rotatably connected with the rotational part, the wheel assembly comprising a wheel ring having an exterior that contacts an inner wall in the well in at least a vertical or horizontal part when in operation, the wheel ring being connected with or forming part of the rotational part, the wheel assembly further comprising the hydraulic motor so that the stationary part and the rotational part constitute the hydraulic motor housing, the hydraulic motor comprising a rotatable section connected with the rotational part for rotating part of the wheel assembly, wherein