水力振动器在地层解堵中的应用研究
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摘要
水力振动器对于解除近井地带的孔隙通道堵塞有着很好的应用效果,有必要对振动器工作过程流场进行研究并分析工况及结构对解堵效果的影响。以计算流体动力学为基础,应用动网格技术及用户自定义函数(UDF),实现腔室结构水力振动器内球体仿真运动并对其解堵过程进行了模拟计算。研究结果表明,球体进出振动器喉道结构瞬间产生水击压缩波及膨胀波,振幅达数兆帕;地层压力释放过程工作液流量减小,球体可能卡止于喉道。通过计算结果研究建立了工作液流量与喉道应具备摩擦力的关系,揭示了水力振动器解堵机理,为水力振动器解堵工况及装置结构优化提供方向。
Hydro-oscillator has a good application effect for the broken down of pore channels near wellbore. It is necessity to study flow field in the working process of hydro-oscillator and analyze the effect of working conditions and tool structure on the deplugging. In this paper, based on computational fluid dynamics, dynamic mesh and user-defined functions(UDF) were used to achieve the simulation movement of ball within chamber structure hydro-oscillator, and its deplugging process was simulated. The results show that water hammer compression wave and expansion wave can be instantly generated while the ball pass in and out of the throat structure of hydro-oscillator, and the amplitude is up to several megapascals. During formation pressure releasing, the flow rate of working fluid decreases, and the ball may be locked in the throat. The relationship between appropriate friction in throat and flow rate of working fluid was established, and the deplugging mechanism of hydro-oscillator was revealed, which could provide direction for the optimization of working conditions and equipment structures.
Hydro-oscillator has a good application effect for the broken down of pore channels near wellbore. It is necessity to study flow field in the working process of hydro-oscillator and analyze the effect of working conditions and tool structure on the deplugging. In this paper, based on computational fluid dynamics, dynamic mesh and user-defined functions(UDF) were used to achieve the simulation movement of ball within chamber structure hydro-oscillator, and its deplugging process was simulated. The results show that water hammer compression wave and expansion wave can be instantly generated while the ball pass in and out of the throat structure of hydro-oscillator, and the amplitude is up to several megapascals. During formation pressure releasing, the flow rate of working fluid decreases, and the ball may be locked in the throat. The relationship between appropriate friction in throat and flow rate of working fluid was established, and the deplugging mechanism of hydro-oscillator was revealed, which could provide direction for the optimization of working conditions and equipment structures.
引文
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[7]FLUENT6.3 UFD Manual[DB/CD].Fluent Inc,2006:13.
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[3]梁春.水力脉冲解堵技术研究与应用[J].科技信息,2010(05X):60-60.
[4]周红梅,于胜春,高劼,等.动网格技术在具有摆动喷管发动机流场数值模拟中的应用[J].海军航空工程学院学报,2009,24(1):17-1.
[5]张来平,邓小刚,张涵信.动网格生成技术及非定常计算方法进展综述[J].力学进展,2010,04:424-447.
[6]肖根福,刘国平,王俊亭,等.动网格在涡旋压缩机三维流场数值模拟中的应用[J].流体机械,2014,42(1):25-29.
[7]FLUENT6.3 UFD Manual[DB/CD].Fluent Inc,2006:13.