分段双曲线柱面声透镜在油井中聚焦的理论研究

Theoretical study on the focusing of the sectional hyperbola cylinder sound lens in oil wells.

超声波采油的主要缺陷是超声波在岩层中的传播距离非常小 ,利用声透镜的聚焦作用 ,可以改变超声波在岩层中的波阵面形状。在岩层中将超声波聚焦 ,可增大超声波在岩层中的强度 ,从而增大超声波在岩层中的传播距离。根据声波的折射规律 ,设计了一种用于井下采油的分段双曲线柱面声透镜 ,并推导出了超声波在岩层中的传播距离及相位差 ,分析了声透镜尺寸及材料中的声速、原油及岩层中的声速对其传播距离的影响。根据油井的口径、原油及岩层中的声速 ,当声透镜选用恰当的材料及尺寸时 。

The main defect of the oil extraction by ultrasonic wave is that the propagation distance of the ultrasonic wave in rock stratum is very small. The wave front of the ultrasonic wave can be changed by using the sound lens. The intensity of the ultrasonic wave will increase when the ultrasonic wave is focused by the sound lens in rock stratum. A sectional hyperbola cylinder sound lens using for oil recovery is designed according to the refraction law of sound. The sphere of action and the phase difference of ultrasonic wave in rock stratum are calculated. The influence of the size of sound lens and the sound velocity in sound lens material and crude oil and rock stratum on the sphere of action is studied. According to the diameter of oil well and the velocity of sound in crude oil and rock stratum, when proper material and size of the sound lens is chosen, the sphere of action of the ultrasonic wave can be extended to scores of centimeters.