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 features
1: more environment friendly, because no need of mud
2: avoid the accident of hole collapse
3: hole quality higher
4: more endurance capacity
5: hole depth deeper, higher efficiency
6: the rig verticality can indicate casing’s verticality
7: only needs casing and related accessories
8: rigs under this pilling method easy to operate, decrease the breakdowns rate
