油田管道不定衰减水声信号的仿真分析
发布时间：2019-07-11 09:49
【摘要】：研究管道水声信号的识别问题,油田管道声信道存在着不定衰减性特征,这种衰减随着管道长度、环境的不同而存在差异,传统的信号识别方法多是根据稳定的信号特征建立模型,很难对这种存在不定衰减特征的信号进行建模,进而造成识别的困难。提出了一种基于声学射线理论的油田注水井管道的声信道模型建立方法。结合声学射线理论知识和油田的现场实验数据,研究注水管道中的声传播特性,分析注水井的水声信道特征,分析由注水井油管的固体声传播媒介和井内流体———水的流体声传播媒介构成的声信道的物理环境,计算声波在这种信道环境下的传播规律,保证识别的准确。实验和仿真结果验证了水声信号经过井口后,几乎衰减至零,利用水声发射换能器发射信号,在实验井和工作井内水声信号能在井口附近能收到信号,其中距离增加井下50m后,仅有耦合信号。识别效果较好。
[Abstract]:In this paper, the identification of pipeline underwater acoustic signal is studied. there are uncertain attenuation characteristics in the acoustic channel of oil field pipeline, which varies with the length of pipeline and the environment. Most of the traditional signal recognition methods are based on stable signal characteristics, so it is difficult to model this kind of signal with uncertain attenuation characteristics, which leads to the difficulty of recognition. A method of establishing acoustic channel model of oil field water injection well pipeline based on acoustic ray theory is proposed. Combined with the theoretical knowledge of acoustic ray and the field experimental data of oil field, the acoustic propagation characteristics in water injection pipeline are studied, the characteristics of underwater acoustic channel in water injection well are analyzed, the physical environment of acoustic channel composed of solid acoustic propagation medium of oil injection well tubing and fluid-water acoustic propagation medium in well is analyzed, and the propagation law of acoustic wave in this channel environment is calculated to ensure the accuracy of identification. The experimental and simulation results show that the underwater acoustic signal decays to zero after passing through the wellhead. Using the underwater acoustic emission transducer to transmit the signal, the underwater acoustic signal can receive the signal near the wellhead in the experimental well and the working well, and only the coupling signal can be obtained after the distance increases by 50m. The recognition effect is better.
【作者单位】： 中国石油大学化学工程学院;
【分类号】：TE973;TN912.3
[Abstract]:In this paper, the identification of pipeline underwater acoustic signal is studied. there are uncertain attenuation characteristics in the acoustic channel of oil field pipeline, which varies with the length of pipeline and the environment. Most of the traditional signal recognition methods are based on stable signal characteristics, so it is difficult to model this kind of signal with uncertain attenuation characteristics, which leads to the difficulty of recognition. A method of establishing acoustic channel model of oil field water injection well pipeline based on acoustic ray theory is proposed. Combined with the theoretical knowledge of acoustic ray and the field experimental data of oil field, the acoustic propagation characteristics in water injection pipeline are studied, the characteristics of underwater acoustic channel in water injection well are analyzed, the physical environment of acoustic channel composed of solid acoustic propagation medium of oil injection well tubing and fluid-water acoustic propagation medium in well is analyzed, and the propagation law of acoustic wave in this channel environment is calculated to ensure the accuracy of identification. The experimental and simulation results show that the underwater acoustic signal decays to zero after passing through the wellhead. Using the underwater acoustic emission transducer to transmit the signal, the underwater acoustic signal can receive the signal near the wellhead in the experimental well and the working well, and only the coupling signal can be obtained after the distance increases by 50m. The recognition effect is better.
【作者单位】： 中国石油大学化学工程学院;
【分类号】：TE973;TN912.3
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