本文選題：聲波衰減 + 透射損失��； 參考：《哈爾濱工業(yè)大學(xué)》2015年碩士論文

【摘要】：超大功率超聲波采油技術(shù)利用大功率超聲波來處理、激勵(lì)油氣儲集層,實(shí)現(xiàn)注采井的增產(chǎn)增注和提高油藏整體采收率的目的。目前對于超聲波能量傳輸問題尚未確切的研究,所以本文從能量傳輸?shù)慕嵌瘸霭l(fā)分析計(jì)算了超聲波能量的損失情況。首先,從平面波理論出發(fā)計(jì)算了超聲波通過固液界面時(shí)產(chǎn)生的能量損失,在計(jì)算中忽略多次反射的因素,計(jì)算得到最終到達(dá)儲油層的超聲波能量僅占初始發(fā)射能量的19.7%;其次,從柱面波理論出發(fā)計(jì)算了柱聲源情況下聲波的擴(kuò)散衰減、散射衰減以及吸收衰減,其中柱面波的擴(kuò)散衰減是導(dǎo)致聲波有效作用距離受限的主要原因;再次,對比平面波在液固界面及固固界面的散射衰減,得到超聲波最終到達(dá)儲油層中的透射聲強(qiáng)為初始聲強(qiáng)的17.68%。然后,推導(dǎo)了原油中聲波的粘滯吸收衰減系數(shù),得到衰減系數(shù)與頻率的平方成正比;最后,對聲場的壓力分布進(jìn)行數(shù)值模擬,得到超聲波的聲壓分布圖及其沿油井徑向的聲壓衰減曲面圖和聲壓變化率曲線。
[Abstract]:The ultra-large power ultrasonic oil recovery technology uses the high power ultrasonic wave to process, excites the oil and gas reservoir, realizes the injection-production well to increase the production to increase the injection and the enhancement reservoir whole recovery factor goal. At present, the problem of ultrasonic energy transmission has not been studied exactly, so the energy loss of ultrasonic wave is analyzed and calculated from the point of view of energy transmission. Firstly, the energy loss caused by ultrasonic wave passing through the solid-liquid interface is calculated based on plane wave theory, and the factor of multiple reflection is ignored in the calculation, and the ultrasonic energy that finally reaches the reservoir is only 19.7% of the initial emission energy. Based on the cylindrical wave theory, the diffusion attenuation, scattering attenuation and absorption attenuation of acoustic waves in cylindrical sound source are calculated. The diffusion attenuation of cylindrical wave is the main reason for the limitation of the effective range of acoustic waves. By comparing the scattering attenuation of plane wave at the liquid-solid interface and the solid-solid interface, it is obtained that the transmitted sound intensity of the ultrasonic wave finally reaching the reservoir is 17.68% of the initial sound intensity. Then, the viscous absorption attenuation coefficient of acoustic wave in crude oil is deduced, and the attenuation coefficient is directly proportional to the square of frequency. Finally, the pressure distribution of sound field is numerically simulated. The sound pressure distribution chart of ultrasonic wave and the curve of sound pressure attenuation surface along the radial direction of oil well and the change rate curve of sound pressure are obtained.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE31

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本文編號：1924722