| 摘要 |
Apparatus for directional drilling in the earth comprises a down hole motor having a stator housing adapted to be connected to a string of drill pipe at one end and having a rotor shaft extending out the other end. The rotor shaft is adapted to receive and drive any suitable rotary bit. The stator housing is provided with fulcrum means in the form of a barrel member having arcuate longitudinal cross section. The fulcrum member is of substantially the same size as the hole being bored and is engageable with the side wall of the hole to provide a fulcrum about the drilling motor can be turned to change direction. A suitable deflection means is positioned at the end of the stator housing adjacent to the connection to the drill string and includes a laterally moveable thrust member which is operable to engage one side of the hole being drilled to deflect the stator housing in the opposite direction and pivot the same on the fulcrum point to change the direction of the hole being drilled. The thrust member may be actuated by any suitable mechanical connecting means or is preferably operated by a remotely controlled pressure operated means.
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