Method and system for remote monitoring of fluid level in oil well

Abstract

A remote monitoring method and system for the dynamic liquid level of an oil well, which collects the dynamic liquid level measurement data of the oil well collected by the dynamic liquid level echo measuring instrument installed at the wellhead of the oil well in a remote wireless manner; adopts an integrated identification method to collect The dynamic liquid surface data are processed, and the two methods run in parallel; the data sequence is processed by the method based on empirical mode decomposition, and the fundamental wave signal point in the collar reflection wave and the echo sound wave encountering the dynamic liquid surface are determined. The point where the reflection occurs, and then calculate the depth of the dynamic liquid surface; use the method based on local mean decomposition to process the data sequence, and also determine the fundamental wave signal point in the coupling reflection wave and the point where the echo sound wave encounters the dynamic liquid surface and reflects , and then the depth of the dynamic surface is calculated; finally, the average of the two depths of the dynamic fluid surface calculated by the two methods is calculated to obtain the final depth of the dynamic fluid surface. The automatic recognition of the dynamic liquid level can be realized, thereby improving the accuracy of the dynamic liquid level calculation.

Description

technical field [0001] The invention belongs to the technical field of oil production in oil fields, and in particular relates to a method and system for remote monitoring of dynamic fluid levels in oil wells. Background technique [0002] Oil well dynamic liquid level is an important parameter in oil field production, which can reflect the downhole liquid supply situation, thereby reflecting the working efficiency of the oil well. It is of great significance to accurately grasp the change of dynamic liquid level to determine the supply and discharge relationship of oil wells and to formulate a reasonable working system. For the measurement of dynamic liquid level, there are mainly buoy method, downhole pressure method, dynamometer measurement method, echo measurement method and so on. The buoy lateral measurement method is generally used for annular wells and open wellhead operating wells, but it cannot be tested under pressure, and the error is large due to the influence ...

AI Technical Summary

Problems solved by technology

The buoy lateral measurement method is generally used for annular wells and open wellhead operating wells, but it cannot be tested under pressure, and the error is large due to the influence of liquid surface foam; the downhole pressure method uses logging instruments or installs pressure sensors in the downhole. And use the working opportunity to recycle the pressure sensor to calculate the dynamic liquid level, which is costly and takes a long construction period; using the dynamometer diagram to calculate the dynamic liquid level has certain application restrictions, and many parameters of the derivation equation are obtained through probability statistics and engineering experience. , to measure some parameters of the oil well through long-term debugging, the adaptability is poor, and the error is also large; the echo method is the most commonly used measurement method in the oil field at present. , by identifying the received rebound signal to determine the depth of the dynamic liquid surface, but the measurement requires manual well-by-well testing, with a large workload and low safety, and after collection, technical personnel need to manually identify the data, which is inefficient

Images