The traveling block on a portable truck-mounted oil well service workover rig in Utah.

america american west colorado plateau moab north america us usa united states utah business color colour crude oil daytime derrick energy production equipment extraction fossil fuel hydrocarbon fuel industrial industry intervention maintenance mast mobile non renewable energy oil and gas industry oil field oil well outdoors outside petroleum industry pulley system pulling unit resources service rig temporary rig traveling block truck mounted upstream vertical format well service well site workover rig