... . Tefico Drilling rig is used for drilling Oil-Gas, Geothermy, Shale gas and Coal Bed Methane; while workover rig is used for ... drilling and/ or rig servicing. 2. What are Tefico manufactured? ... ZJ30/1700LDB, ZJ40/2250LDB, ZJ50/3150LDB, ZJ70/4500LDB/LD. Tefico workover rig includes XJ250, XJ350, XJ450, XJ550, XJ650, XJ750 , XJ850, 1000HP ...