| 摘要 |
A tubing string forming a conduit is installed within a well. Contained within the tubing string and vibrationally isolated therefrom is a rod string. Mounted on the rod string and spaced therealong at intervals which are less than a quarter wavelength at the resonant vibration frequency of the rod string are a series of sonically responsive impeller pump elements. The rod string is suspended in the tubing string from a vibration generator comprising an orbiting mass oscillator. The orbiting mass oscillator is operated at a frequency such as to cause resonant standing wave vibration at the rod string, the vibrational energy causing the impeller elements to drive fluid from the well up the tubing string.
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