水平定向钻进破岩数值仿真及力学特性分析

Numerical Simulation of Horizontal Directional Drilling for Rock Breaking and Analysis of Mechanical Properties

摘要:

水平定向钻进技术在城市地下空间开发、资源勘探等领域具有广阔的应用前景,但其破岩过程复杂,研究水平定向钻进过程的动态特性及参数响应规律十分重要。本文以PDC钻头和牙轮钻头为研究对象,基于ABAQUS建立了水平定向钻进地层的三维有限元仿真模型,模拟了钻头在钻进过程中岩体的变形、破坏和钻头的受力情况,得到了钻头的反力和扭矩的响应曲线,并分析两种钻头破岩动态特性的差异。通过参数化仿真,研究了不同钻进参数和岩石力学参数对钻头破岩动力学特性的影响规律。基于响应面分析法建立了钻头反力和扭矩的多元参数回归预测模型,从而得出两种钻头的钻速预测方程,并验证了该方程具有较高的精确性,为优化钻进参数、提高钻进效率提供了理论依据。

关键词:ABAQUS;水平定向钻进;钻速方程;PDC钻头;牙轮钻头

Abstract:

Horizontal directional drilling technology has broad application prospects in urban underground space development, resource exploration, and other fields. However, its rock breaking process is complex, making the study of the dynamic characteristics and parameter response patterns of horizontal directional drilling processes crucial. This paper focuses on PDC bits and roller cone bits, establishing a three-dimensional finite element simulation model of horizontal directional drilling formations based on ABAQUS. The model simulates the deformation, failure of rock mass, and the forces acting on the bit during drilling, obtaining response curves for bit reaction forces and torques, and analyzing the dynamic differences in rock breaking characteristics between the two types of bits. Through parametric simulation, the study investigates the influence patterns of different drilling parameters and rock mechanics parameters on the bit"s rock breaking dynamics. A multivariate parameter regression prediction model for bit reaction forces and torques is developed using response surface analysis, deriving drilling speed prediction equations for both types of bits. The accuracy of these equations is verified, providing a theoretical basis for optimizing drilling parameters and improving drilling efficiency.

Key words:ABAQUS; Horizontal directional drilling; Drilling speed equation; PDC bits; roller cone bits