Rock Strength Determination Based on Rock Drillability Index and Drilling Specific Energy: Numerical Simulation Using Discrete Element Method

In the present research, two real-time rock strength determination models based on drilling parameters were studied. Firstly, a discrete element software named Particle Flow Code in 2 Dimensions (PFC 2D ) was used to analyze applicability of drillability index and specific energy, which graded particle assemblies created simulate behaviour. numerical models, Weibull distribution randomize bonds between particles make assembled model with different heterogeneity. The process PDC (polycrystalline diamond compact) cutter modelled steps: horizontal linear cutting vertical pressing-in progress. From process, peak forces obtained outputs relationship normal force depth. Subsequently, methods for calculating energy proposed model. Then, calculated indexes investigated (supported regression analysis). Moreover, effect heterogeneity, along error comparison above indexes, discussed. results showed that is more accurate than assessment (The about 10% smaller).