Abstract
Measurement of sound velocity in oil wells has long been a challenging industrial issue due to the difficulty in obtaining clear oil pipe coupling waves in strong noise. In this paper, a novel sound velocity measurement method is developed for the dynamic liquid level of oil wells based on fast adaptive median filtering. First, to solve the noise interference problem in the reflected oil pipe coupling wave, a fast adaptive median filtering algorithm is proposed to obtain an accurate oil pipe coupling wave. Then a curve fitting method based on range discrete coefficient is developed to estimate the sound velocity in the tubing-casing annular space of oil wells. The fitting sound velocity can reflect the propagation rule of the real sound velocity. In particular, the sound velocity at any position within the tubing-casing annular space can be accurately calculated by the fitting function. Finally, the proposed method is applied to the dynamic liquid level of an oil well. Experimental results show the effectiveness and favorable accuracy in estimating the sound velocity distribution.
Highlights
Oil is a very important resource for national economies and defense security
How to accurately estimate the sound velocity in the oil well is the key to measuring the dynamic liquid level, which is directly related to the accuracy of the dynamic liquid level
We propose a novel sound velocity measurement method for oil wells based on fast adaptive median filtering
Summary
Oil is a very important resource for national economies and defense security. The global oil resources are relatively scarce and oil field production capacity is shrinking gradually due to the lack of hydrocarbon resources and low recovery efficiency. The Marr wavelet was employed to filter the interference noise in the echo signal, and accurate oil pipe coupling waves and surface waves can be extracted to measure dynamic liquid levels [12]. It must be noted that the echo method mainly uses the reflected oil pipe coupling wave to estimate the sound velocity and calculates the depth of the dynamic liquid level using the sound velocity and the time of receiving the reflected surface. How to accurately estimate the sound velocity in the oil well is the key to measuring the dynamic liquid level, which is directly related to the accuracy of the dynamic liquid level To address these concerns, we propose a novel sound velocity measurement method for oil wells based on fast adaptive median filtering.
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