A novel method for measuring and analyzing the interaction between drill bit and rock
A novel method for measuring and analyzing the interaction between drill bit and rock
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DOI：
10.1016/j.measurement.2018.02.045
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发表时间：
2018-06
期刊：
影响因子：
5.6
通讯作者：
Xu Wang;Zhenquan Wang;Deguo Wang;Lin Chai
中科院分区：
文献类型：
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作者：
Xu Wang;Zhenquan Wang;Deguo Wang;Lin Chai
钻头与岩石相互作用机理的研究是钻井工程破岩理论领域的研究热点。井底形状是钻头与岩石相互作用研究的关键因素，直接影响着井底周围不同位置破岩的效果。本文旨在探讨井底形状对破岩效果的影响。首先建立了破岩强度的数学模型，并以此为评价指标，分析了井底形状对破岩效果的影响。其次，通过实验和数值模拟验证了岩石破碎强度与切割速度、切割深度、岩性和井底形状的关系。用有限元方法建立了岩石破岩强度与井底形状关系的数学模型。最后，以破岩能耗最小为目标，引入“每转破冠功”为目标函数对井底井身形状进行优化，利用井底形状对称且与牙冠形状相对应的特点，通过反设计确定PDC钻头牙冠形状的优化设计。本文将有助于推广钻头设计思想，促进破岩理论研究的发展。
Research on the interaction mechanisms between a bit and rock is a focus of the field of rock breaking theory in drilling engineering. The bottom hole shape, which directly affects the effectiveness of rock breaking at different positions around the bottom hole, is the key factor in research on the interaction between a bit and rock. This paper aims to discuss the influences of bottom hole shape on effectiveness of rock breaking. Firstly we established the mathematical model of rock breaking strength and used it as an evaluation index to analyze the influence of bottom hole shape on effectiveness of rock breaking. Secondly, the relationship between the rock breaking strength and cutting speed, cutting depth, rock lithology and bottom hole shape are verified by experimental approach and numerical simulation. The mathematical model of the relationship between the rock breaking strength and the bottom hole shape is established with a finite element method. Finally, this paper takes minimum rock-breaking energy consumption as the goal and introduces the “crown breaking work per revolution” as an objective function to optimize the bottom hole shape.This paper uses the fact that the shape of the bottom hole is symmetric and corresponds to the crown shape to determine the optimal design of a PDC bit crown profile by inverse design. This paper will help to expend the ideas of bit design and promote the development of research on rock breaking theory.