Fixed Diameter Hole Openers are designed for use in soft clays
and shales to medium-hard shales and limestones. It is particularly effective in
sticky formations where balling problems are encountered. Three jets with
replaceable nozzles continuously clean the tool’s cutting structure, clearing debris
buildup and increasing penetration.
Fixed Diameter Hole Openers are used in the following conditions:
1. When drilling of a big hole is not possible because of rig capacity.
2. When a satisfied penetration rate is not obtained when drilling a big hole, it is
used after drilling is completed with a smaller bit.
3. When the hole direction must be controlled.