Mechanical characteristics of a threaded joint of coring tool under makeup torque

Core samples play a very important role in understanding the characteristics and conditions of rock formation. The coring tool is the primary equipment used to obtain a core sample, which has been widely used in engineering, and oil and gas drilling, for example. In this paper, the models of conventional coring joints and special coring joints are established to study the mechanical properties of the two joints being subjected to makeup torque load. The results show that the design of the special coring tool with double shoulders effectively shares the force on the thread and has a good mechanical performance compared with the conventional single-shoulder coring tool.