CAJ | 학술논문

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。
수력진동기대우해제근정지대적공극통도도새유착흔호적응용효과，유필요대진동기공작과정류장진행연구병분석공황급결구대해도효과적영향。이계산류체동역학위기출，응용동망격기술급용호자정의함수（UDF），실현강실결구수력진동기내구체방진운동병대기해도과정진행료모의계산。연구결과표명，구체진출진동기후도결구순간산생수격압축파급팽창파，진폭체수조파；지층압력석방과정공작액류량감소，구체가능잡지우후도。통과계산결과연구건립료공작액류량여후도응구비마찰력적관계，게시료수력진동기해도궤리，위수력진동기해도공황급장치결구우화제공방향。
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.