Numerical simulation and mechanical property analysis of rock breaking for horizontal directional drilling

Abstract:

Horizontal directional drilling technology has broad application prospects in urban underground space development， resource exploration， and other fields. However， it has complex rock breaking process， making the study of the dynamic characteristics and parameter response patterns of horizontal directional drilling processes crucial. This paper takes the PDC bit and roller bit as research objects， a three-dimensional finite element simulation model of horizontal directional drilling formations based on ABAQUS is established， in which the deformation， failure of rock mass and the forces acting on the bit during drilling are simulated， the response curves of bit reaction forces and torques are obtained， and the dynamic differences in rock breaking characteristics between the two types of bits are analysed. Through parametric simulation， the influence of different drilling parameters and rock mechanics parameters on the dynamics properties of bit’s rock breaking is investigated. A multivariate parameter regression prediction model for bit reaction forces and torques is developed based on response surface analysis， and the drilling speed prediction equations for both types of bit are derived， and the accuracy of these equations is verified. These researches provide a theoretical basis for optimizing drilling parameters and improving drilling efficiency.