System and method for measuring split-phase volume fraction of oil-gas-water multi-phase fluid in oil production well logging

Abstract

The invention provides a system and method for measuring split-phase volume fraction of oil-gas-water multi-phase fluid in oil production well logging. According to the system for measuring the split-phase volume fraction of the oil-gas-water multi-phase fluid in oil production well logging, a light signal reflected by oil well underground petroleum is converted to an electric signal through a multi-receiving-end optical fiber probe sensor, and the electric signal is transmitted to a data processing analysis system through a data collection system. According to the data processing analysis system, through a clustering network model from comprehensive feature parameters to the oil-gas-water multi-phase fluid, according to the comprehensive feature parameters obtained by feature extraction and normalization processing carried out on a voltage signal detected by the multi-receiving-end optical fiber probe sensor, split-phase volume fraction information of the oil well underground oil-gas-water multi-phase fluid is obtained, measurement error of split-phase volume fraction of the oil well underground oil-gas-water multi-phase fluid is reduced, and the technical defect that an optical fiber method cannot realize oil-water detection is overcome.

Description

technical field [0001] The invention relates to the field of petroleum exploration, in particular to a system and method for measuring the phase-separated holdup of oil-gas-water multiphase fluid in petroleum production logging. Background technique [0002] The oil wells in the mid-to-late development stage have a high water content, and in the deep reservoir area of ​​the oil well, the gas mainly exists in the crude oil in the form of dissolved gas. During the upward flow of the crude oil, the gas gradually precipitates as the pressure decreases. Flow characteristics of oil-gas-water multiphase fluids are formed in oil wells. In addition, in order to improve the recovery factor, water injection and gas injection flooding and recovery technologies are widely used in major oil fields. As a result, the flow phenomenon of gas-liquid, oil-water and oil-gas-water multiphase flow is very common in the process of oil production and development. In this case, it is necessary to m...

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Problems solved by technology

[0004] However, due to the complex and changeable environment of the oil well, among the existing multiphase flow holdup measurement methods, the acoustic method has a large measurement error; the optical method has a sensitive response and small volume, but the sensor is difficult to process and can only achieve gas-liquid phase measurement at present. ; The tomographic imaging method is complex in technology, large in size, and low in measurement efficiency; the electrical method and the capacitance method are greatly affected by interference, corrosion, and scaling. There is still room for further development

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