| 摘要 |
An apparatus for creating a pulling force on a bottom hole assembly contained within a bore hole is disclosed. Generally, the apparatus comprises a housing, a piston having a first section and a second section, and a venturi member, operatively associated with the piston, adapted for creating a zone of low pressure. In one embodiment, the housing is attached to a work string and the piston is attached to a bottom hole assembly. The first section of the piston and the housing forms a first chamber. The second section of the piston and the housing forms a second chamber. The venturi member contains a first passageway for communicating the zone of low pressure created by the venturi member with the first chamber; and a second passageway for communicating the inner diameter of the venturi means with the second chamber. In the preferred embodiment, the venturi member comprises a nozzle operatively associated with the piston; a mixing tube, formed on the inner diameter of the piston; and, a diffuser section adjoining the mixing tube. A method of moving a piston in a down hole environment is also disclosed.
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