Engine speed control for hoist and tongs

Details Engine speed control for hoist and tongs Engine speed control for hoist and tongs

B - Operations, Transporting

66

D

B66D 3/18 (2006.01) B66D 1/18 (2006.01) B66F 11/00 (2006.01) E21B 19/06 (2006.01) E21B 41/00 (2006.01) F02D 29/04 (2006.01)

Patent

CA 2360235

A mobile service rig for servicing an oil well includes a variable speed engine and a multi-speed transmission that selectively powers a drive wheel for transport, a hoist for lifting and lowering well-related components, and a hydraulic circuit for a tong used in tightening and loosening sucker rods or tubing. A speed adjuster operatively coupled to the engine limits the speed of the engine when the tong is operating, while a flow restriction limits the rate of hydraulic fluid flowing through the tong. Such an arrangement reduces power consumption, reduces heat, and avoids over tightening a sucker rod connection.

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