Experimental Study on Energy Consumption of Rock Cutting under Different Groove Geometry

Abstract

Abstract The Polycrystalline Diamond Compact (PDC) cutter is a kind of rock breaking tool that is widely used in oil and gas exploitation. PDC cutter directly contacts with the rock during the process of the rock cutting. Therefore, it is of great significance to investigate the rock breaking mechanism of the PDC cutter to improve the rock breaking efficiency. This article sets up a test bench of rock cutting, which consists of a single cutter, high-speed cameras, and several data collectors, to monitor the cutting force, mechanical specific energy, energy dissipation, and the chip formation process. The results show that a frequent fluctuation of the value of the tangential force is related to the fly leaping phenomenon and particle size of debris. The ratio coefficient of the cross section describes the relations of energy dissipation between different sections. While changing the distribution density of the PDC cutter on the drilling bit, a minimum value of rock-breaking specific work will appear, and the rock breaking efficiency can be improved. The arc length back virtual work and the virtual crushing work express the storage and release of rock internal energy, which can explain the fracture phenomenon from the aspect of energy dissipation.