Modelling tool for improving drilling and excavation

 

State of the art

 

Specific cutting structure layouts, combined with application-specific cutters, have delivered up to 50% improvement in abrasion resistance, and are 20% more resistant to chipping/spalling. On the other hand, drilling requirements depend on the ground composition (type and granulometry of rocks). Thus, drilling parameters and tool properties might vary depending on the drilling site. It means that optimization of drilling performance needs a deep knowledge about tool-ground interaction to determine the best tool materials for different drilling site.

 

The GEOFIT solution

 

The GEOFIT breakthrough comes from the introduction of new computational techniques such as discrete element methods, which is used to simulate the cutting process induced by the excavation tools, but this method requires high computing power. Thus GEOFIT will introduce a novel particle-based finite element method for modelling the drilling and excavation process recently developed and tested. This will help operators to choose the optimum cutting structure and operating parameters.

 

The GEOFIT contribution

 

GEOFIT will improve the drilling hardware parameters making use of novel wear test and excavation modelling techniques. Modelling excavation using numerical simulation is relatively new.

 

A series of tailored wear tests will be performed, based on a modified ASTM G65 test to select the best options for field tests and to reproduce the same wear mechanisms and patterns encountered in tools used during drilling of different ground media. To mimic the situation in rock drilling, a bloc-on-ring configuration will be mounted, using different ground media as counterpart. Also, a slurry of water and abrasive particles will be introduced in specimen’s interface in order to simulate rock crushing and drilling fluids.