Wear experiment on underwater drilling of P110 steel using superhard abrasive core drill

Abstract

P110 steel, renowed for its good comprehensive mechanical properties, is widely used as casing in oil and gas wells. However, it is seriously worn when using cemented carbide tools to drill it underwater. The study delves into the experimental exploration of the wear ratio of P110 steel during underwater drilling using three different kinds of super-hard abrasive grains and binders. The investigation includes tracking and observing the morphological changes of abrasive grains on the core drill's surface, along with the analysis of graphitization on the surface of diamond abrasive grains. The results show that under the same processing conditions, the end wear of the three different core drills is roughly the same. However, the side wear of the core drill using diamond abrasive particles is significantly less than that using cubic Boron Nitride (cBN) abrasive particles. Under the condition of underwater machining, the end face diamond abrasive grains will produce graphitization. Despite this, the diamond abrasive grains still maintain a certain cutting ability. The hardness of the bonding agent affects the exposure of abrasive particles, which results in the difference in the performance of the core drill under different working conditions.

Keywords

• super hard abrasive
• core drill
• underwater drilling
• p110 steel
• wear