| 摘要 |
An agitator tool (1) for introducing forward and backward axial movement in a downhole tool of a drill string, where the agitator tool comprises a first axially moveable element (5) coupled to a second laterally moveable element (9) arranged inside a housing (2) via a mechanical coupling. The mechanical coupling may be a pin and groove arrangement where the groove forms a modified or unmodified sinus shaped guiding loop that allows the first element (5) to oscillate within the housing (2). The second element (9) is driven by a turbine unit which may have flow regulating means. This provides an agitator tool comprising very few moving and wearable parts. The shape of the groove sections allows an accelerated and/or de-accelerated forward and backward movement of the first element (5) that allows it to be used for various applications in a bore hole. |
