井下机械式脉动发生器的实验研究

设计了一种机械式脉动发生器,挂接在接箍上,利用注水泥过程中液体在装置上的压力降实现能量转换,将液体的动能转化为压力脉动,流场扰动,声波场等。这些能量场在液体中传递并衰减,就造成了井下流场和流态的变化,改善了驱替效果。并在实验室对其脉动效果进行了室内实验,采用压力传感器和数据采集系统测试了轴心动压力,利用信号分析软件对采集到的数据进行了波形分析和频谱分析,试验结果表明,机械式脉动发生器的脉动效果是显著的。

EXPERIMENTAL STUDY OF DOWNHOLE MECHANICAL-PULSE GENERATOR

The paper presents a mechanical-pulse generator, which is connected to the coupling. By the pressure drop of the cementing, the generator converts the liquid kinetic energy into the pressure pulsation, flow field disturbance, sound wave field, and so on. It results in changing the downhole flow field and flow status when the energy field passes through the liquid and attenuates, and it improves the displacement efficiency. Making use of the signal software, we did the waveform and spectral analysis for the results of the pulse experiment of the mechanical -pulse generator in laboratory, and tested the dynamic pressure of its axis center by the pressure transducer and data collecting system. It was proved that the pulse efficiency of the mechanical-pulse generator is remarkable.