A New Method for Oil Well Dynamic Fluid Level Detection Based on the Column Sound Field Model

doi:10.11885/j.issn.1674-5086.2013.10.17.11

Abstract

Abstract:

It is important to measure the depth of dynamic liquid level of oil well in order to set reasonable oil extraction
technology. In this paper，we proposed a detection method of oil well dynamic fluid level based on the sound field model of
the column，in order to solve the problem of weak echo signal，large noise disturbance and difficult identification of liquid
level wave in the traditional echo method. In this method，the typical string structure can be analyzed with the pipeline acoustic
theory. Moreover，the relationship between the well dynamic fluid level depth and the natural frequency of the tube sound field
is established，according to the sound field characteristic of the column and resonance theory of tube air column，inspired by the
fact that the vocal frequency of wind instrument can reflect the acoustic pipe length. Then we measured the natural frequency
of the sound field in tube by Fast Fourier Transform（FFT），and liquid level depth of tube will be obtained. The experimental
results confirm the relationships between the string air resonance frequency and dynamic liquid level，and show that the tube
liquid level depth is more accurate within 2% relative error by using this method which provides a new way for the accurate
detection of the well dynamic fluid level depth.

Key words: dynamic fluid level, detection, natural frequency, sound field model, FFT

Zhou Wei1*, Jia Wei2, Guo Xiaoyu3, Li Taifu1, Yi Jun1. A New Method for Oil Well Dynamic Fluid Level Detection Based on the Column Sound Field Model[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2013.10.17.11.

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