Eccentric Under Reamer is a special kind of downhole reaming tool. It can be installed in the drilling string to get a larger hole while drilling, which can ensure running the logging instruments, production casing or expandable packer completions in the hole more safely and smoothly.
Proven applications
Shale laterals;
Extended reach wells;
Creeping salts;
Swelling shales
Features
1. Eccentric shapes allows drilling larger hole than it passes through;
2. Forward spiral blades ensure protection, stability, and durability while enabling drillout;
3. Dual cutting structures allows forward reaming and back reaming;
4. Cleans the wellbore before expandable packer completions / running production casing;
5. Help eliminate / minimize micro doglegs;
6. Stirs cutting beds;
7. Eliminates delicated wiper trips.