Patent ID: 6276449
Filing Date: 2001-08-21
Classification: B66D,E21B

Abstract:
A mobile service rig for servicing a well, comprising:a drive wheel adapted to propel said mobile service rig;a hoist;a pump;a motor driven by said pump;a tong driven by said motor;an engine being operatively coupleable to said drive wheel, said hoist, and said pump, said engine having a lower speed mode and a higher speed mode when operatively coupled to said hoist and said pump, wherein said engine operates within a first speed range in said lower speed mode and operates within a second speed range in said higher speed mode with a first average speed of said first speed range being lower than a second average speed of said second speed range; anda speed adjuster operatively coupled to said engine, said speed adjuster being adapted to selectively determine said lower speed mode and said higher speed mode, said speed adjuster being further adapted to unattendantly maintain said engine selectively at said lower speed mode and said higher speed mode.