Longitudinal Positioning Tool for a Rod String

A rod driving tool for longitudinally positioning and driving rotation of a rod string relative to a tubing string receiving the rod string therein, the tool comprising:

• a drive head including housing supported above the tubing string and a rotatable output arranged to receive the rod string concentrically therethrough;
• a rod clamp arranged to be clamped about the rod string at a location spaced above the drive head;
• an upper hollow shaft member arranged to be fixed to the rod clamp so as to be arranged to receive the rod string therethrough and be arranged rotate with the rod string;
• a lower hollow shaft member slidably coupled to the upper hollow shaft member such that the upper and lower hollow shaft members are rotatable together with one another and are longitudinally adjustable relative to one another;
• the lower hollow shaft member being coupled to the rotatable output of the drive head for rotation therewith relative to the housing of the drive head;
• a hydraulic lifting assembly comprising:
• a lower portion supported on the housing of the drive head;
• an upper portion supporting the upper hollow shaft member and rod clamp thereon;
• the upper portion being coupled to the lower portion so as to be longitudinally movable relative to the lower portion between a retracted position in which the rod clamp is supported thereon at a first elevation relative to the tubing string and an extended position in which the upper portion is raised upwardly relative to the retracted position and the rod clamp is supported thereon at a second elevation relative to the tubing string which is greater than the first elevation;
• and
• a hydraulic actuator arranged to operate the upper portion between the retracted position and the extended position;
• and
• at least one bearing member supporting the upper hollow shaft member for rotation relative to the housing of the drive head.