Experimental research on failure mechanism and evolution characteristics of thermal-treated granites under action of impact load with PDC cutter

IF 6.4 1区工程技术 Q2 ENERGY & FUELS

Petroleum Science Pub Date : 2026-10-01 Epub Date: 2026-05-27 DOI:10.1016/j.petsci.2026.05.034

Hao-Yu Wang, Yan Xi, Wei Lian, Jun Li, Hai-Long Jiang, Yu-Mei Li

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引用次数: 0

Abstract

High rock temperatures and complex engineering environments are the most significant problems in enhancing the rate of penetration (ROP) and drilling tool efficiency for hot dry rocks (HDR). Studying the failure characteristics of different thermal-treated granites by PDC cutters during percussive drilling has profound significance in enhancing the compatibility between drilling teeth and rock during HDR mining and optimizing the drilling toolʼs efficiency in breaking rocks. Through drillability tests and SHPB tests, the present study explored the relationship between drillability and the dynamic behavior of granites. In addition, granites with different heating temperatures and cooling methods were subjected to dynamic rock-breaking tests by the SHPB system installed with the PDC cutter. Furthermore, the impact crater was quantified by 3D contour scanning technology, and the fractal theory was utilized to analyze the fragments. Then, the equations for the dynamic magnification factor of intrusion, fractal dimension, and specific rock-breaking energy of granite upon impact loading are discussed. According to the results, the impact crater size is closely associated with the heating temperature of the rock. Heating and rapid cooling treatments will affect the thermal shock damage and strength of rock, and then change the penetration depth, damage volume, and area of impact craters generated from the PDC cutter. The granite at 600 °C exhibits about 45% smaller fragment size than that at room temperature, while the damage degree of the liquid nitrogen-cooled specimen will be greater. According to the variation of dynamic magnification factor, fractal dimension, and specific rock-breaking energy of rock with thermal shock damage, it can be found that with the temperature increasing, the problems drilling tools need to solve gradually shift from increasing ROP to improving cleaning efficiency. The experimental results are expectedly to lay the ground for high compatibility between drilling tools and formation in HDR.

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PDC切削齿冲击载荷作用下热处理花岗岩破坏机理及演化特征试验研究

高温岩石和复杂的工程环境是影响热干岩钻井提高机械钻速和钻具效率的主要问题。研究不同热处理花岗岩切削齿在冲击钻井过程中的破坏特征，对于提高HDR开采时钻齿与岩石的相容性，优化钻具破岩效率具有重要意义。通过可钻性试验和SHPB试验，探讨了花岗岩可钻性与岩石动力特性的关系。此外，还对不同加热温度和冷却方式的花岗岩进行了加载PDC切削齿的SHPB系统动态破岩试验。利用三维轮廓扫描技术对撞击坑进行量化，并利用分形理论对碎片进行分析。然后，讨论了花岗岩在冲击载荷作用下的动态侵入放大系数、分形维数和比破岩能的方程。结果表明，撞击坑的大小与岩石的加热温度密切相关。加热和快速冷却处理会影响岩石的热冲击损伤和强度，从而改变PDC切削齿产生的穿透深度、损伤体积和陨石坑面积。在600℃下，花岗岩的碎片尺寸比室温下小45%左右，而液氮冷却试样的损伤程度会更大。根据热冲击损伤岩石的动态放大系数、分形维数和比破岩能的变化可以发现，随着温度的升高，钻具需要解决的问题逐渐从提高机械钻速转向提高清洗效率。实验结果有望为HDR钻井工具与地层的高相容性奠定基础。

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来源期刊

Petroleum Science 地学-地球化学与地球物理

CiteScore

7.70

自引率

16.10%

发文量

311

审稿时长

63 days

期刊介绍： Petroleum Science is the only English journal in China on petroleum science and technology that is intended for professionals engaged in petroleum science research and technical applications all over the world, as well as the managerial personnel of oil companies. It covers petroleum geology, petroleum geophysics, petroleum engineering, petrochemistry & chemical engineering, petroleum mechanics, and economic management. It aims to introduce the latest results in oil industry research in China, promote cooperation in petroleum science research between China and the rest of the world, and build a bridge for scientific communication between China and the world.