Power tong
AssigneeWeatherford/Lamb, Inc.
InventorsJoerg Eric Schulze-Beckinghausen, Bernd-Georg Pietras
Life of this patent
Estimating the term…
Abstract
This invention relates to a rotary and a method for facilitating the connection of pipes, and more particularly, but not exclusively, to a rotary for a powered drill pipe tong for facilitating the connection of sections or strands of drill pipe to a string of drill pipe.
Claims27
Amended) A rotary comprising at least one jaw and a hydraulic circuit for displacing said at least one jaw, characterized in that the hydraulic circuit is acted upon by a pneumatic fluid.
A rotary comprising at least one jaw and means for said at least one jaw, characterized in that said rotary comprises an accumulator for storing a charge for displacing said jaw and a bellows for storing hydraulic fluid.
A tong for rotating a tubular, comprising:
- a plurality of jaws for engaging the tubular;
- a hydraulic circuit for displacing at least one of the plurality of jaws;
- and
- a pump for pumping hydraulic fluid through the hydraulic circuit, wherein the pump is acted upon by a pneumatic fluid.
A method of facilitating the connection of tubulars, comprising:
- providing a tong having a plurality of jaws;
- pressurizing an accumulator in the tong to a predetermined pressure;
- supplying pneumatic fluid to activate a pump;
- activating the pump to circulate an operating fluid to actuate the plurality of jaw;
- rotating at least one of the tubulars;
- and
- releasing the plurality of jaws.
A rotary, comprising:
- at least one jaw;
- a hydraulic circuit for displacing the at least one jaw, wherein the hydraulic circuit is sealed;
- and
- a bellows for containing hydraulic fluid flowing in the hydraulic circuit.
- hydraulic fluid in a hydraulic circuit for displacing said jaw, characterized in that said hydraulic circuit is sealed.
Dependencies are inferred from the claim text.