Online measurement method for gas-liquid two-phase flow in liquid-producing gas reservoir well

Abstract

An online measurement method for gas-liquid two-phase flow in a liquid-producing gas reservoir well comprises the steps of 1, assuming that a gas phase and a liquid phase in the gas-liquid two-phase flow, flow at the same flow speed and are evenly mixed, and heat balance is kept between the two phases so as to obtain the two-phase mixing density; 2 according to a homogeneous flow gas-liquid two-phase flow calculation formula, determining the function relationship between the gas-liquid two-phase flow coefficient K and the gas-liquid two-phase mass flow W according to the relationship between the gas-liquid two-phase flow coefficient K and the gas holdup parameter and the two-phase flow formula. According to the invention, the real-time measurement that the two phases of flow simultaneouslyflow in a pipe and do not interfere with each other is realized, and compared with the existing measurement method, the method has the advantages that the defects of the traditional method are overcome, the measurement precision is improved, a signal feedback mechanism is improved, the online measurement of the gas-liquid two-phase flow is truly realized, etc.

Description

technical field [0001] The invention belongs to the technical field of gas-liquid two-phase flow measurement in liquid-producing gas reservoir wells, and in particular relates to an on-line measurement method for gas-liquid two-phase flow in liquid-producing gas reservoir wells based on gamma ray absorption technology. Background technique [0002] At present, the exploitation of some natural gas reservoirs in my country has entered the middle and late stages, and most of the wells in the gas reservoirs have different degrees of liquid production, and the liquid production brings about the increase of the bottom back pressure of the gas reservoir and the phenomenon of liquid film counterflow in the vertical production pipeline. Intensified, the problem of stable production of pure gas wells is becoming more and more serious, such as Ordos Daniudi gas field, Sichuan Xinchang gas field, etc. Therefore, how to accurately obtain the gas production content in water-bearing gas rese...

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Problems solved by technology

[0003] The separation method is to separate the two-phase fluid first and then measure it. Commonly used methods include density difference separation method and off-line separation method. Although the separation method is simple and easy to implement, because this method destroys the flow state of the two-phase fluid during the gas recovery process, it cannot be truly accurate. It reflects the complex working conditions in the well, and the measurement error is large, so the frequency of use is getting lower and lower in recent years

[0004] The integral method regards the gas-water two-phase fluid as a whole, and the two phases in the whole are mixed in various flow states, and the two-phase content is measured by one or more measuring devices, and the two-phase content is calculated according to the two-phase formula, such as a probe method, capacitance method, etc., but the gas well is divided into two parts, vertical and horizontal, in the process of natural gas exploitation, and the measurement device cannot interfere with the fluid flow state, so the above-mentioned probe method will indirectly destroy the fluid flow state in the measurement, while the capacitance method is due to the signal For problems such as transfer response time, the measurement error for complex flow states is relatively large, so an online measurement method that does not interfere with the fluid flow state and better reflects the complex flow state of two-phase fluids is needed for measuring natural gas-water Two-phase flow, and establish the formula of the value transfer relationship between the two

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