为提取CO2预裂过程动态参数以优化预裂工艺,基于某CO2预裂实验数据,利用小波变换对CO2预裂装置腔内动态压力信号进行时频特征分析,得到不同频带上压力信号分量的时间历程曲线和能量分布.分析结果表明,通过对预裂过程腔内压力信号的小波分解重构,可以同时反映压力信号的强度、频率、波形对能量分布的影响,结合不同频带的时间历程曲线可以获得动态压力在不同频带上的分布和衰减的细节信息,进而确定频带分量对预裂效果的影响.%In order to optimize the pre-splitting technonogy by means of the dynamic parameter extraction of CO2 pre-split-ting process,on the basis of the experimental data of a certain CO2 pre-splitting,the wavelet transform is used to perform the time-frequency characteristics analysis for the dynamic pressure signal in intracavity of CO2 pre-splitting device,which can ob-tain the time history curve and energy distribution of the pressure signal components at different frequency bands. The analysis results show that the wavelet decomposition and reconstruction of the intracavity pressure signal in pre-splitting process can re-flect the influence of the pressure signal′s intensity,frequency and waveform on energy distribution. The time history curves of different frequency bands are combined to get the detail information of the dynamic pressure distribution and attenuation at different frequency bands,so as to determine the influence of frequency band components on pre-splitting effect.
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