scholarly journals Progress and development of particle jet drilling speed-increasing technology and rock-breaking mechanism for deep well

2021 ◽  
Author(s):  
Tiancheng Fang ◽  
Fushen Ren ◽  
Hanxu Liu ◽  
Yuan Zhang ◽  
Jianxun Cheng
Keyword(s):  
Constitutive Model ◽  
High Efficiency ◽  
Rock Breaking ◽  
Drilling Speed ◽  
Speed Increase ◽  
Deep Well ◽  
Jet Impact ◽  
Drilling Technology ◽  
Breaking Mechanism ◽  
Hard Formation

AbstractIncreasing drilling speed and efficiency of hard formation for deep and ultra-deep well is one of the international recognized drilling problems and key technologies to be tackled urgently. Particle jet impact drilling technology is an efficient non-contact rock-breaking method to overcome slow drilling speed, which has great development and application potential in drilling speed-increase of hard formation and deep well. High efficiency drilling technology and rock-breaking speed-increase mechanism in high temperature, high pressure and high hardness formations of deep and ultra-deep wells were mainly focused and keynoted in this paper. With extensive investigation of domestic and foreign literature, the working principle, key technical devices, deep-well-rock mechanical characteristic, unconventional constitutive model and rock-breaking mechanism of particle jet impact drilling technology were analyzed, which proved the feasibility and high efficiency for deep and hard stratum, and also, dynamic failure mechanism of rock needs to be elaborated by constructing the constitutive model with high temperature and pressure. Meanwhile, the major problems to be solved at present and development direction future were summarized, which mainly included: miniaturization of drilling equipment and individualization of drilling bit; optimization of jet parameters and the evaluation method of rock-breaking effect; establishment of mechanical property and unconventional constitutive model of deep-well-rock; rock-breaking mechanism and dynamic response under particle jet coupling impact. The research can help for better understanding of deep-well drilling speed-increasing technology and also promote the development and engineering application of particle jet impact drilling speed-increase theory and equipment.

The Technical Development for Increasing ROP with Particle Impact Drilling in China

2014 ◽  
Vol 904 ◽  
pp. 292-295 ◽  
Author(s):  
Jian Zhao ◽  
Yi Ji Xu
Keyword(s):  
Field Test ◽  
Hard Rock ◽  
Rock Breaking ◽  
Particle Impact ◽  
Sound Effect ◽  
Deep Well ◽  
Working Principle ◽  
Hard Formation ◽  
Field Test Result ◽  
Test Result

Field test of particle impact drilling (PID) technology was firstly carried out in deep well and hard formation in Sichuan province china on Oct. 2013. The test formation was named Xu Jiahe, which was very difficult to penetration. Field test result shows that the ROP (rate of penetration) was nearly doubled by this technology. It indicates that there is a profound application prospect of particle impact drilling, especially for hard rock formation. In this paper, the equipment and working principle was analyzed. The experiment and simulation results showed that the rock breaking efficiency was highly increased by this technology. The details of this field test were presented too in this paper that proved the sound effect of PID.

scholarly journals Particle jet impact deep-rock in rotary drilling: Failure process and lab experiment

PLoS ONE ◽  
2021 ◽  
Vol 16 (4) ◽  
pp. e0250588
Author(s):  
Tiancheng Fang ◽  
Fushen Ren ◽  
Baojin Wang ◽  
Jianxun Cheng ◽  
Hanxu Liu
Keyword(s):  
Damage Evolution ◽  
Failure Process ◽  
Damage Model ◽  
Engineering Application ◽  
Rock Breaking ◽  
Drilling Speed ◽  
Rotary Drilling ◽  
Rock Stratum ◽  
Technical Problems ◽  
Jet Impact

Aimed at the technical problems of low drilling speed and difficult rock-breaking in deep-well and hard rock-stratum, particle waterjet coupled impact rock-breaking technology in rotary drilling is put forward in this paper. Firstly, the working principle of particle jet impact rock-breaking in rotary drilling was introduced, and the acceleration model of particle jet and the damage model of rock were established. The acceleration mechanism of particles and dynamic damage evolution process of rock under particle jet were studied, which showed that the broken pit and rock damage would increase with time gone on, and damage evolution of rock presented the radial expansion. Then, experimental device of particle jet coupled impact rock-breaking in rotary state was developed, and the effect of jet parameters on penetration depth and failure volume was analyzed with comparison of la experiment and numerical simulation. The results showed that drilling speed with particle jet impact is twice that of conventional drilling, and combination nozzles layout of impact angle with 8°and 20° can achieve rock-drilled rapidly, which also demonstrated the correctness of simulation method. The device development and the rock-breaking results analysis would be of great value for engineering application.

Application Research on Low-Pressure Pulse and Cavitation Jet Compound Drilling Technology

2011 ◽  
Vol 137 ◽  
pp. 205-209 ◽  
Author(s):  
Wen Fei Li ◽  
Guang Lei Wang
Keyword(s):  
Pressure Pulse ◽  
Breaking Strength ◽  
Low Pressure ◽  
Rock Breaking ◽  
Strength Increase ◽  
Application Research ◽  
Hydraulic Power ◽  
Well Drilling ◽  
Deep Well ◽  
Drilling Technology

In the low-pressure pulse and cavitation jet compound drilling technology, pulse low-pressure and cavitation jet generator is installed on bit, water jet modulated by generator can generate pulse low-pressure, which will alternate rock mechanics, decrease rock breaking strength, increase rock-breaking efficiency. And cavitation jet generated can increase hydraulic power downhole. The results show that low-pressure pulse and cavitation jet generator has been run well from 5349m to 6162m for 129.36h-136.63h in TK1090 well, increasing drilling speed 40.6%～85.1%. The low-pressure pulse and cavitation jet compound drilling technology can increase drill speed and be deployment in deep well drilling.

scholarly journals Research on PDC bit Drilling Rate Equation in Daqing Medium-Deep Well Based on Rock Breaking Experiments by PDC Bit

2015 ◽  
Vol 8 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Li Wei ◽  
Yan Tie ◽  
Xu Xinghua ◽  
Li Siqi
Keyword(s):  
Rate Equation ◽  
Specific Weight ◽  
Rock Breaking ◽  
Regression Equation ◽  
Drilling Speed ◽  
Drilling Rate ◽  
Red Sandstone ◽  
Deep Well ◽  
Pdc Bit ◽  
Weight On Bit

PDC bit drilling rate equation is one measuring criterion of PDC bit work efficiency. The reasonable PDC bit drilling rate equation could predict the penetration rate and provide guidance for field operation. This paper studied the influences of the parameters on PDC bit drilling rate, such as rock drillability, cutting teeth diameter, specific weight on bit and rotate speed, and regressed the relation equations between the above parameters and drilling rate for cement rock, white sandstone, yellow sandstone, red sandstone and granite based on the laboratory rock breaking experiments. The results showed that the regression equation between specific weight on bit and drilling rate is quadratic polynomial for the soft and intermediate hardness rock, such as cement rock, yellow sandstone and white sandstone. The regression equation is quartic polynomial, the regression equation between rotate speed and drilling rate is quadratic polynomial for the intermediate hardness rock, such as red sandstone. The field data verification results of Daqing Oilfield medium-deep well showed the fractional error in actual drilling speed and forecast drilling speed between 3.03% and 9.23% and the average error is 6.397%. This explained that the modified PDC bit drilling rate equation could describe the drilling law preferably.

scholarly journals Dynamic Analysis of Percussion Drilling System under Harmonic Impact

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Yijin Zeng ◽  
Shidong Ding ◽  
Jinchao Xu ◽  
Qunai Hu ◽  
Xiaojie Cui
Keyword(s):  
Excitation Frequency ◽  
Harmonic Excitation ◽  
Rock Breaking ◽  
Simplified Model ◽  
Vibration Displacement ◽  
Impact System ◽  
Drilling Technology ◽  
Vibration Impact ◽  
Breaking Mechanism ◽  
The Impact

As a new efficient rock-breaking technology, harmonic impact drilling technology has received great attention, but the research on its rock-breaking mechanism is insufficient, which limits its development. Based on the theory of vibration, a simplified model of high-frequency harmonic vibration impact system is established in this paper. The numerical model was solved by Matlab and the motion equations of drill bit and rock at different stages of motion are obtained, respectively. Based on the factor analysis of the mathematical model, the dynamic characteristics of the impact system under harmonic excitation are studied. Finally, numerical simulations are carried out to further analyze the drilling effect of harmonic impact drilling and verify the correctness of the simplified model. The results show that when the excitation frequency equals the resonance frequency of rock, the vibration displacement of rock reaches the peak value. The drilling speed is greatly increased by harmonic impact drilling compared with conventional drilling.

High-Efficiency Cut Blasting with Shell Radial Shaped Charge in Laboratory-Scale Blasting

2015 ◽  
Vol 1094 ◽  
pp. 445-450 ◽  
Author(s):  
Wei Chen ◽  
Hong Hao Ma ◽  
Zhao Wu Shen ◽  
De Bao Wang
Keyword(s):  
High Efficiency ◽  
Circular Tube ◽  
Rock Breaking ◽  
Shaped Charge ◽  
Axial Line ◽  
Rock Excavation ◽  
Crack Network ◽  
Utilization Ratio ◽  
The Cost ◽  
The Ideal

Due to the inefficiency problem of the cut blasting in rock excavation and rock breaking, a shell radial shaped charge device was proposed based of the ideal of ‘cutting to slotting’ and it was validated through experiments. For this device, the shell materials are used to be shaped materials and multiple shaped ring is designed on the circular tube. It can not only reduce charge quantity but also raise the utilization ratio of explosive energy. After explosion, multiple radial shaped charge jets can be formed along the axial line in sequence and then the surrounding rock mass would be cracked. The crack network will be formed along with the further extension of the fraction under the action of quasi static loading of detonation gas. The shell radial shaped charge device was tested through the cut blasting model experiment. Experimental results show that the utilization ratio of blasting hole nearly approaches 98% with this device. The blasting efficiency and cyclical footage can be improved effectively and the cost of drifting can also be reduced.

Study on Rock-Breaking Simulation and Experiment of Double Disc Cutter of TBM

2016 ◽  
Vol 23 ◽  
pp. 80-88
Author(s):  
F. Lu ◽  
C. Zhang ◽  
J. Sun ◽  
J.X. Tian ◽  
M. Liu ◽  
...  
Keyword(s):  
Rock Breaking ◽  
Disc Cutter ◽  
Element Analysis ◽  
Breaking Effect ◽  
The Finite Element Analysis ◽  
Breaking Mechanism ◽  
Simulation And Experiment ◽  
Tbm Cutter ◽  
Cutter Spacing ◽  
The Impact

In order to improve working efficiency of the tunneling process and extend working life of disc cutter, explore the impact of cutter spacing and loading for the cutter rock-breaking effect. With the theory of rock crushing, Based on the finite element analysis software ABAQUS, the process of disc cutter breaking rock is simulated, considering the adjacent cutters sequential constraints, then, to make sure two cutter space with the method of SE in experiment.The simulation results showed that the optimal cutter spacings were both about 80mm in the same loading and the sequentially loading, but the rock-breaking effect of sequentially loading is better than the same loading. The experimental data showed that the minimum specific energy of rock breaking is appeared cutter spacing between 80mm and 90mm. Thus, the correctness and rationality of the simulation was verified. The study is good for understanding the rock-breaking mechanism of double disc cutter and has a certain promoting value to optimize TBM cutter system.Keywords:TBM, rock fragmentation, ABAQUS, cutter spacing, sequentially cutting

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