Combined measurement method of acoustic and electric sensors for flow parameters of oil-gas-water three-phase flow

Abstract

The invention relates to a combined measurement method of flow parameters of oil-gas-water three-phase flow with acoustic and electric sensors, the method is as follows: sequentially installed in small vertical pipes from bottom to top: pulse transmission type ultrasonic sensor with patch shape, with protective electrode Arc-shaped wall-to-wall conductivity sensor and plug-in conductivity sensor; use transmissive ultrasonic sensor to extract gas holdup of oil-gas-water three-phase flow; use plug-in conductivity sensor to obtain oil-gas-water three-phase flow relative flow rate; based on arc-shaped pair with guard electrode The wall-type conductivity sensor responds to the signal and extracts the water holdup of the three-phase flow of oil, gas and water; realizes the prediction of the total flow and separate-phase flow of the three-phase flow. The invention can effectively measure the three-phase flow of oil, gas and water.

Description

technical field [0001] The invention relates to a method for combined measurement of flow parameters of oil-gas-water three-phase flow by acoustic and electric sensors Background technique [0002] As onshore oilfields gradually enter the stage of high water-cut production, from the exploitation of thick and good layers to the exploitation of thin and poor layers, the underground geological conditions are becoming more and more complex, and most of the oil wells are in the state of low liquid production. According to statistics, 33% of oil wells in Daqing Oilfield are less than 20 cubic meters per day; 88.5% of oil wells are less than 15 cubic meters per day in Liaohe Oilfield; 87.2% of oil wells are less than 10 cubic meters per day in Xinjiang Oilfield. If we consider many factors of formation crude oil degassing or gas production, oil well dynamic monitoring will inevitably face severe production conditions of low liquid production and high water cut oil-gas-water three-p...

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Problems solved by technology

[0004] Aiming at the problem of oil-gas-water three-phase flow production profile logging in oil wells, the existing concentrating radioactive low-energy oil-gas-water three-phase flow flow measurement method encounters difficulties: ①. The assumptions of the radioactive low-energy density and water holdup measurement model are three Phase flow is homogeneous flow, but the flow characteristics of low-production liquid and high-water three-phase flow are difficult to meet the harsh measurement flow conditions; There is a nonlinear response characteristic between the turbine blade speed and the total flow velocity of the fluid, and the measurement of the total flow produces a large error; ③. Due to the unfavorable factors such as the statistical fluctuation of radioactivity and the slow measurement response speed of the radioactive low energy method, the oil-water interphase density The measurement accuracy of the water holdup or oil holdup with a small difference is low; ④. The radioactive source Cd-109 is a radionuclide (half-life is 453 days) produced by an accelerator, and it also has advantages in safety production, instrument cost and environmental protection. Larger limitations

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