基于排屑性能的扩孔气动冲击器设计方法
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摘要
为了提高硬质地层中扩孔气动冲击器的排屑性能,基于岩屑颗粒在排屑流场中的临界流速原则,运用计算流体力学理论和Fluent仿真软件,研究了一种与排屑性能相关的扩孔气动冲击器设计方法,并将该设计方法在反向扩孔气动冲击器上进行应用.得到设计前后冲击器排屑流场内气相速度分布规律,岩屑颗粒速度及轨迹变化情况和环路内岩屑颗粒浓度分布情况.研究结果表明:反向扩孔气动冲击器排屑流场环路内岩屑颗粒临界流速为6.02 m/s,采用该设计方法能够有效地增加反向扩孔气动冲击器的排屑性能,使得排屑流场环路内气流速度增加到10 m/s左右,岩屑颗粒在排屑流场的停留时间减短,流场内颗粒浓度分布范围由0~100 kg/m3下降到0~4 kg/m3.
In order to improve the cuttings removal performance of reaming pneumatic impactors in hard layers,the computational fluid mechanics theory and Fluent simulation software were employed to find out a design method based on the critical velocity principle of cutting particles,which is related to the cuttings removal performance of reaming pneumatic impactors and then it was applied to the back-reaming pneumatic impactor. The speed distribution regularities of gas phase,the change of cutting particles' velocity and trajectory,and the concentration distribution of cutting particles in the flowfield of the back-reaming pneumatic impactor were obtained. The results showed that the cutting particles' critical velocity of the back-reaming pneumatic impactor in the cuttings flowfield is 6. 02 m/s. The design method related to cuttings removal performance can effectively strengthen the cuttings removal performance of the back-reaming pneumatic impactor,and the velocity of gas phase increases to 10 m/s in the flowfield. The time when cutting particles remain in the flowfield is shortened,and the value of particle concentration distribution range in the flowfield decreases from 0 ~ 100 kg/m3 to 0 ~ 4 kg/m3.
In order to improve the cuttings removal performance of reaming pneumatic impactors in hard layers,the computational fluid mechanics theory and Fluent simulation software were employed to find out a design method based on the critical velocity principle of cutting particles,which is related to the cuttings removal performance of reaming pneumatic impactors and then it was applied to the back-reaming pneumatic impactor. The speed distribution regularities of gas phase,the change of cutting particles' velocity and trajectory,and the concentration distribution of cutting particles in the flowfield of the back-reaming pneumatic impactor were obtained. The results showed that the cutting particles' critical velocity of the back-reaming pneumatic impactor in the cuttings flowfield is 6. 02 m/s. The design method related to cuttings removal performance can effectively strengthen the cuttings removal performance of the back-reaming pneumatic impactor,and the velocity of gas phase increases to 10 m/s in the flowfield. The time when cutting particles remain in the flowfield is shortened,and the value of particle concentration distribution range in the flowfield decreases from 0 ~ 100 kg/m3 to 0 ~ 4 kg/m3.
引文
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[3]Ariaratnam S T,Chan W,Choi D.Utilization of trenchless construction methods in mainland China to sustain urban infrastructure[J].Practice Periodical on Structural Design and Construction,2006,11(3):134-141.
[4]Li J,Zhou M,Si Y N,et al.Trenchless repair technology and application of urban sewer system[J].Applied Mechanics and Materials,2014,470:992-997.
[5]徐海良,赵宏强.一种反向冲击的气动冲击器:CN101666211[P].2010-03-10.(Xu Hai-liang,Zhao Hong-qiang.Pneumatic impact device with reverse impact:CN101666211[P].2010-03-10.)
[6]Liu G H,Song T Y,Li J.Analysis on cutting carrying capacity of gas in gas drilling for horizontal well[J].Petroleum Drilling Techniques,2009,37(5):26-29.
[7]Wang K,Pan H,Liu Z.Numerical simulation on dense phase pneumatic conveying diversion characteristics in branch pipeline[J].Science and Technology,2013,27(3):303-308.
[8]徐海良,李峰,赵宏强,等.反向扩孔气动冲击器的计算机仿真与优化研究[J].振动与冲击,2015,34(12):101-107.(Xu Hai-liang,Li Feng,Zhao Hong-qiang,et al.Optimization and simulation of reverse counterboring pneumatic impactor[J].Journal of Vibration and Shock,2015,34(12):101-107.)
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[10]张兆顺,崔桂香,许春晓.湍流理论与模拟[M].北京:清华大学出版社,2006.(Zhang Zhao-shun,Cui Gui-xiang,Xu Chun-xiao.Turbulence theory and simulation[M].Beijing:Tsinghua University Press,2006.)
[11]王雄,李德波,罗坤.圆孔射流近场湍流特性DNS与RANS模拟的对比研究[J].能源工程,2010,30(5):1-6.(Wang Xiong,Li De-bo,Luo Kun.Comparison of DNS and RANS calculations of the round jet flow in the near field region[J].Energy Engineering,2010,30(5):1-6.)
[12]Xu H L,Li W,Zhao H Q,et al.Cuttings carrying characteristics of back-reaming pneumatic impactor exhaust during drilling operation[J].Petroleum Exploration and Development,2016,43(1):131-137.