Fluid driven screw type sonic oscillator-amplifier system for use in freeing a stuck pipe
This patent describes a system for providing sonic vibrational energy to effect the freeing of a section of well pipe stuck in a well bore. It comprises: an orbital oscillator including a housing; an elongated screw shaped stator mounted in the housing and an elongated screw shaped rotor mounted for precessionally rolling rotation freely in the stator; means for suspending the oscillator for rotation within the section of pipe bout the longitudinal axis of the drill pipe in close proximity to the stuck portion thereof; and drive means for rotatably driving the rotor to effect orbital lateral sonic vibration of the housing such that the housing precesses laterally around the inner wall of the pipe. Also described is a method for freeing a section of pipe stuck in a bore hole.
- Assignee:
- NOV; NOV-90-018026; EDB-90-106262
- Patent Number(s):
- A; US 4913234
- Application Number:
- PPN: US 7-299392A
- OSTI ID:
- 6843053
- Country of Publication:
- United States
- Language:
- English
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