Numerical Simulation and Experimental Study on Novel Rock-Breaking Concept-Layered Spalling

机译：新型摇滚概念层拼写的数值模拟与实验研究

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Cutter, the fundamental cutting element of PDC (Polycrystalline Diamond Compact) bit, directly determines the overall performance of PDC bit and thus influences Rate of Penetration (ROP), drilling efficiency and drilling cost. Bit scrapped caused by cutter failure accounts for about 90% of all the failure in field operations. A majority of researches have been conducted on PDC cutter design, which were mainly concentrated on structure itself, such as stress state, self-sharpening and interface bonding strength, while neglecting the closely related factor of the rock-breaking method. This paper presents a novel PDC cutter which is designed based on the bionics theory to illustrate the layered spalling concept of rock-breaking. This paper has paid much attention to studying the numerical simulation of dynamic rock-breaking process under new bionic PDC cutter to illustrate the rock-breaking mechanism. Meanwhile, the corresponding experiments have been performed with a single cutter to validate the theory. The results indicate that: (a) the process of rock-breaking under the new bionic PDC cutter is characterized as "layered spalling" with slight oscillation comparing to the property-"Block Dropping" of conventional cutter. (b) the cutting process of bionic cutter is more stable with minor impact vibration, which contributes to improving the cutter's life to some extent. The amplitude of cutting force reduces by 42% and the average value of the new bionic PDC cutter is 460N while the conventional PDC cutter is 790N.

机译：切割器，PDC（多晶硅钻石致电压）钻头的基本切割元件，直接确定PDC位的总体性能，从而影响穿透速度（ROP），钻井效率和钻井成本。刀具故障引起的位数占现场操作中所有失败的约90％。在PDC刀具设计上进行了大多数研究，主要集中在结构本身，如应力状态，自锐化和界面粘合强度，同时忽略凿岩方法的密切相关因子。本文提出了一种基于仿生学理论设计的新型PDC切割机，以说明分层剥落的摇摆型突出概念。本文提请重视新仿生PDC切割机下动态摇摆过程的数值模拟，以说明摇摆断裂机构。同时，通过单个切割器进行了相应的实验来验证理论。结果表明：（a）新的仿生PDC切割器下破坏的过程具有与传统刀具的性质 - “块滴”相比，具有轻微振荡的“层状剥落”。（b）仿生刀切割过程更稳定，轻微的冲击振动，这有助于在一定程度上提高刀具的寿命。切削力的幅度降低了42％，并且新的仿生PDC切割器的平均值为460N，而传统的PDC切割器为790n。

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《US Rock Mechanics/Geomechanics Symposium》|2017年|742 p. :|共5页
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Yongsheng Liu;
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中图分类 TU45-532;
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PDC; Numerical Simulation; Experimental Study;

机译：PDC;数值模拟;实验研究;

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5. Experimental and numerical evaluation of concrete spalling during extreme thermal loading. [D] . Yanko, William Andrew. 2004

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Numerical Simulation and Experimental Study on Novel Rock-Breaking Concept-Layered Spalling

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