Combined measurement method of electroacoustical sensor for flow parameters oil-gas-water three-phase flow

Abstract

The invention relates to a combined measurement method of an electroacoustical sensor for flow parameters of an oil-gas-water three-phase flow. The combined measurement method comprises the steps of successively mounting a pulse transmission type patch shape ultrasonic sensor, an arc-shaped wall facing type conductivity sensor with a protective electrode, and an insertion type conductivity sensor from bottom to top; extracting the gas holdup of the oil-gas-water three-phase flow by means of the transmission type ultrasonic sensor; obtaining related flow velocity of the oil-gas-water three-phase flow by means of the insertion type conductivity sensor; extracting the gas holdup of the oil-gas-water three-phase flow based on a responding signal of the arc-shaped wall facing type conductivity sensor with the protective electrode; and realizing predication of total flow and single-phase flows of the three-phase flow. The combined measurement method can be used for performing effective measurement on the oil-gas-water three-phase flow.

Description

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

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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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