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高频谐波振动冲击破岩机制及试验分析
李思琪,闫铁,李玮,卢亚涛,李显义
0
(东北石油大学石油工程学院,黑龙江大庆 163318;中国石油大庆油田第六采油厂,黑龙江大庆 163114;中国石油钻井工程技术研究院,北京 102206)
摘要:
基于振动学理论,建立高频谐波振动冲击破岩的物理模型和数学模型,应用MATLAB软件对数学模型求解,分析各参数对简谐振动激励下岩石振动的影响,并通过室内试验进一步验证高频谐波振动冲击钻井技术的破岩效果。结果表明:在简谐振动激励下,机械钻速比常规钻井提高了13.2%;岩石刚度、阻尼、临界力与机械钻速呈反比,动态激振力与机械钻速呈正比,激励频率与岩石固有频率越接近,机械钻速越大;机械钻速随着钻压、转速的增加而增加。
关键词:  高频谐波振动冲击  破岩模型  因素分析  室内试验
DOI:10.3969/j.issn.1673-5005.2015.04.011
基金项目:国家自然科学基金重大项目(51490650);国家自然科学基金项目(51274072);东北石油大学研究生创新科研项目(YJSCX2014-011NEPU)
Mechanism experimental study of rock breaking assisted with high frequency harmonic vibration and impaction
LI Siqi,YAN Tie,LI Wei,LU Yatao,LI Xianyi
(Institute of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China;The Sixth Oil Production Plant of Daqing Oilfield, PetroChina, Daqing 163114, China;Drilling Research Institute, PetroChina, Beijing 102206, China)
Abstract:
A new and efficient rock breaking technique assisted with high frequency harmonic vibration and impaction was developed for drilling in complicated and hard formations. In this study, physical and mathematical simulation models were established to study the process rock breaking based on the theory of vibration. The mathematical model was solved by the MATLAB software, and the effects of various parameters on rock vibration under the harmonic vibration excitation were analyzed. The effect of the vibration and impaction technique on rock breaking has been verified through indoor experiments. The experimental results show that the penetration rate under the harmonic vibration excitation is increased by 13.2%. The penetration rate increases with the increase of the dynamic excitation force, while rock 's stiffness, damping and critical force have a negative effect on penetration rate. The more closer between the excitation frequency and the natural frequency of rock, the greater the penetration rate is. Nevertheless, the penetration rate also increases with the increasing of the weight on bit and rotation speed.
Key words:  high frequency harmonic vibration  rock breaking model  factor analysis  indoor experiment
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