Double wall casing for oscillators or full casing rotary drilling rigs

With the development of full casing rotater drilling rig, the full casing method enjoys more and more attention and reputation, compared with traditional pilling methods, it has the following features1: more environment friendly, because no need of mud2: avoid the accident of hole collapse3: hole quality higher4: more endurance capacity5: hole depth deeper, higher efficiency6: the rig verticality can indicate casing’s verticality7: only needs casing and related accessories8: rigs under this pilling method easy to operate, decrease the breakdowns rate