ECCENTRIC HOLE OPENER
Hole Opener is usedto enlarge big surface hole in onshore and offshore oil field, that is, it is used to enlarge the hole pre-drilled by tricone bit, or it is connected above the drill bit to complete the drilling and enlarging operations at the same time. There are three type for cutter: type “SM“used for soft to medium formation; type “MH” used for medium to hard formation; type “XH” used for hard formation.
Under reamer is a tool to enlarge the hole size in drilling operation and save the trip times, this under reamer is mechanically expandable, so it can expediently control the cutters to expand and shrink when drilling. It has the advantages of ingenious structure, convenient control and flexible action features.