Patent ID: 6079490
Filing Date: 2000-06-27
Classification: E21B

Abstract:
A retractable and self-contained mobile repair unit for repairing wells at a plurality of various job sites, said mobile repair unit having a universal capability of servicing an inner pipe string, a sucker rod, and a pump, said mobile repair unit comprising:a truck frame supported on a plurality of wheels;an engine coupled to said truck frame and adapted to relocate said truck frame to said various job sites;a hydraulic pump coupled to said engine;an air compressor coupled to said engine;a first transmission coupled between said engine and said plurality of wheels;a second transmission coupled to said engine;a variable speed hoist coupled to said second transmission;an extendible derrick pivotally coupled to said truck frame, said derrick being selectively repositionable to a lowered position and a working position, said derrick being retracted in said lowered position and extended in said working position, said derrick being pointed upward but having a longitudinal centerline that is angularly offset from vertical in said working position;a block suspended by said hoist at a position that is angularly offset to said centerline of said derrick when said derrick is in said working position, said block being selectively coupled to said inner pipe string, said sucker rod, and said pump, said block in conjunction with said hoist being adapted to raise and lower said inner pipe string, said sucker rod, and said pump in a substantially vertical direction;a first hydraulic cylinder coupled to said derrick and said hydraulic pump, said first hydraulic cylinder adapted to extend and retract said derrick;a second hydraulic cylinder coupled to said derrick and said hydraulic pump, said second hydraulic cylinder adapted to pivot said derrick;a hydraulic tong coupleable to said hydraulic pump and adapted to apply a torque to at least one of said inner pipe string and said sucker rod, thereby facilitating installation and removal of at least one of said inner pipe string and said sucker rod;a pneumatic slip coupleable to said air compressor and adapted to selectively grip and release said inner pipe string to facilitate installation of said inner pipe string;a first transducer providing a first signal that varies as a function of weight applied to said block;a clock providing a time of day reference;a memory electrically coupleable to said first transducer, said memory storing a first plurality of digital values representative of said first signal, said first plurality of digital values being associated with said time of day reference; anda modem electrically coupleable to said memory, said modem adapted to link said memory to a remote home base to establish a communication link between said remote home base and said plurality of various job sites at which said retractable and self-contained mobile repair unit is working.