Powered Slip Actuation

摘要

A system for pushing and pulling rod strings through the ground or an underground pipe. The apparatus has a downhole tool attached to the distal end of the rod string. The push/pull machine has a stationary frame that is placed against the ground to provide a reaction surface. The stationary frame has an opening for the rod string to pass through. A rod gripping assembly is supported on the machine frame and moveable relative to the stationary frame. The rod gripping assembly has a slip bowl, jaws, a thrust member and an actuator. The actuator powers movement of the jaws into the slop bowl to cause a powered gripping of the rod string by the machine. With the rod string gripped a cylinder assembly is activated to push the rod gripping assembly toward the stationary frame thereby pushing the rod string into the ground.

主权项

1. An apparatus for pushing and pulling a rod string, the apparatus comprising:
a downhole tool; wherein the rod string is connected to the downhole tool at a first end and comprises a plurality of rod string sections connected together end-to-end; a stationary frame having an opening for the rod string to pass through the stationary frame; a rod gripping assembly comprising;
a slip bowl assembly;a pair of jaws disposed within the slip bowl assembly and around a rod string section disposed within the slip bowl assembly;a thrust member aligned with the slip bowl, wherein the pair of jaws are connected to the thrust member; andan actuator to move the thrust member and the pair of jaws relative to the slip bowl assembly to push the pair of jaws into the slip bowl assembly to grip the rod string section disposed within the slip bowl assembly; a cylinder assembly operable to push and pull the rod gripping assembly relative to the stationary frame when the pair of jaws is gripping the rod string and to move the gripping assembly relative to the rod string when the actuator has moved the yoke away from the slip bowl assembly to release the grip of the pair of jaws.