【摘要】：研究管道水聲信號(hào)的識(shí)別問(wèn)題,油田管道聲信道存在著不定衰減性特征,這種衰減隨著管道長(zhǎng)度、環(huán)境的不同而存在差異,傳統(tǒng)的信號(hào)識(shí)別方法多是根據(jù)穩(wěn)定的信號(hào)特征建立模型,很難對(duì)這種存在不定衰減特征的信號(hào)進(jìn)行建模,進(jìn)而造成識(shí)別的困難。提出了一種基于聲學(xué)射線理論的油田注水井管道的聲信道模型建立方法。結(jié)合聲學(xué)射線理論知識(shí)和油田的現(xiàn)場(chǎng)實(shí)驗(yàn)數(shù)據(jù),研究注水管道中的聲傳播特性,分析注水井的水聲信道特征,分析由注水井油管的固體聲傳播媒介和井內(nèi)流體———水的流體聲傳播媒介構(gòu)成的聲信道的物理環(huán)境,計(jì)算聲波在這種信道環(huán)境下的傳播規(guī)律,保證識(shí)別的準(zhǔn)確。實(shí)驗(yàn)和仿真結(jié)果驗(yàn)證了水聲信號(hào)經(jīng)過(guò)井口后,幾乎衰減至零,利用水聲發(fā)射換能器發(fā)射信號(hào),在實(shí)驗(yàn)井和工作井內(nèi)水聲信號(hào)能在井口附近能收到信號(hào),其中距離增加井下50m后,僅有耦合信號(hào)。識(shí)別效果較好。
[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.
【作者單位】： 中國(guó)石油大學(xué)化學(xué)工程學(xué)院;
【分類(lèi)號(hào)】：TE973;TN912.3

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