Lumped sensing system for two-phase flow in annular space

Abstract

The invention relates to a lumped sensing system for two-phase flow in an annular space. The system is used for measuring the two-phase flow flowing through a vertical pipeline from bottom to top. The system comprises a reducing insulating insert body (2), a distributed round conducting probe array (1) and related speed measuring electrodes (3 and 4) inlaid in the insert body, and the reducing insulating insert body is composed of a thin section (8), a transition section (9) and a thick section (10) sequentially from bottom to top. The four annular related speed measuring electrodes are fixed inside the thin section (8), two of the related speed measuring electrodes are distributed upstream, and the other two related speed measuring electrodes are distributed downstream. The distributed round conducting probe array (1) is composed of two or more local probes, and all the local probes are uniformly arranged on the same section of the vertical pipeline and fixed on the inner side of the pipe wall of the vertical pipeline. The system has the advantages of fast response, convenience in mounting and accuracy in measurement.

Description

Technical field [0001] The invention relates to a two-phase flow annular space lumped sensing system. Background technique [0002] Most of the reservoirs in China's oilfields are continental clastic rock deposits, and the heterogeneity of the reservoirs is much more complicated than that of overseas marine sedimentary-dominated reservoirs. Judging from the status of newly developed oilfields, the grade of newly proven reserves has decreased, and the reserves of low-permeability and ultra-low-permeability oilfields account for a relatively large proportion. Judging from the status quo of the developed oilfields, they have generally entered the stage of high water cut and high recovery degree. Most of the main old oilfields have entered or approached the late development stage of ultra-high water cut, and their oil wells are particularly characterized by low permeability, low production and high water cut production. [0003] For the non-uniform flow conditions of local flow...

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Problems solved by technology

[0004] However, due to the serious slippage effect between oil and water phases with low flow rates and high water content, the dispersed phases are characterized by non-uniform distribution and random movement, so that the current annular conductivity sensors or overcurrent capacitive sensors have very limited resolution of water content, which is far from reaching low flow rates. The accuracy requirements for the measurement of dilute phase holdup still require a new optimized design of the sensor type and its electrode geometric characteristics to ensure that the sensor has a high measurement resolution for the presence of oil bubbles in the measurement field

[0005] To understand the production status of each layer of low-production liquid and high water-cut oil wells, the current production profile logging instruments for oil well dynamic monitoring have not yet met the production profile testing accuracy requirements

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