摘要：Axial-torsional coupled percussive drilling is a novel technology to enhance the rate of penetration (ROP), which takes advantage of both axial and torsional percussive drilling technologies. Our paper focuses on experimental investigations on coupled percussive drilling. A novel experiment setup, using a rock breaking tester, was developed to carry out dynamic drilling tests on granite specimens under different impact modes, weight on bit (WOB), rotation rates, and lithologies. Based on the optimization analysis of window functions, by combining the fast Fourier transform (FFT) and short-time Fourier transform (STFT) processing methods, the spectrum and 3D time-frequency-amplitude evolution characteristics of coupling impact response signals were demonstrated. According to experimental results, a high-frequency and high-amplitude rotational rate and lower torque are produced in coupling impact. The agglomeration of the cutting force is alleviated and the occurrence of "stick -slip effect" is slowed down. Compared with axial impact, the penetration depth and ROP are increased by 173.38% and 182.74% in coupling impact, respectively. As the WOB increases, a stable-high frequency and high amplitude rock breaking torque is generated, which increases the cutting force and ROP. There is an optimal ratio between the rotation rate controlled by the axial rotator and the torsional impact frequency, which takes advantage of axial and torsional percussion for a bit and obtains the optimal speed-raising effect. The variation of rock mechanical properties has a significant influence on the amplitude of time domain signals in coupling impact. Our results in this paper are of great value for future studies of axial-torsional coupled percussive drilling.

关键字：Axial -torsional coupled percussive drilling; Rate of penetration; Impact rock -breaking experiment; Stick -slip effect; Spectrum signature

ISSN号：0920-4105

卷、期、页：卷: 219

发表日期：2022-12-01

影响因子：4.345800

期刊分区（SCI为中科院分区）：三区

收录情况：SCIE（科学引文索引网络版）,地学领域高质量科技期刊分级目录（国外T1）,EI（工程索引）

发表期刊名称：JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING

通讯作者：孙照伟

第一作者：穆总结,黄中伟,武晓光,李根生,宋先知

论文类型：期刊论文

论文概要：穆总结,黄中伟,孙照伟,武晓光,李根生,宋先知，Experimental study on dynamic characteristics of axial-torsional coupled percussive drilling，JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING，2022，卷: 219

论文题目：Experimental study on dynamic characteristics of axial-torsional coupled percussive drilling