液压双稳射流激振器的理论分析与仿真

Mechanism and simulation of hydraulic bistable fluidic oscillator.

液压双稳射流激振器在上、下封隔器之间的井筒中产生液压振动波，此振动波通过射孔孔道作用于油层，是用振动法激活油层的一种有效工具。它利用Ｃｏａｎｄａ 效应使液流方向变换流经左通道或右通道，通道的压力损失随液阻而变化。由于各通道的液阻不同，便在主振荡区（ 被振油层） 形成液压振动波。基于这一原理，建立了数学模型并进行了仿真。结果表明，位于被处理油层的激振器主振荡区的压力ｐ 随时间ｔ 发生周期性变化而形成液压振动波，此振动波的振幅Ａ与井口液压力ｐ０ 呈线性关系，而与惯性管液阻Ｒ近似地呈指数关系。

Hydraulic vibration wave is produced in the well bore between upper packer and lower packer by a hydraulic bistable fluidic oscillator. The wave acts on oil layer through perforation channel. Therefore the oscillator is an efficient tool of activating oil layer by means of vibration. The oscillator makes the liquid changing flowing direction and flowing through the right and left channels in which the pressure loss varies with the liquid flow resistance. Hydraulic vibration wave is formed in the primary vibration zone(wellbore) owing to the difference of the liquid flow resistance in every channel. Based on this principle, a mathematical model is set up and simulation is made. It is concluded that the pressure P of the primary vibration zone of the oscillator in activating oil layer varies with time t periodically, thereby hydraulic vibration wave is produced. The amplitude of wave is linear with wellhead pressure P 0 and exponential with fluid resistance of inertia tube R approximately.