Dimension optimization method for key components of two-phase flow annular space lumped sensing system

Abstract

The invention relates to a method for optimizing the size of a key part of a two-phase-flow annular space lumped sensing system. The two-phase-flow annular space lumped sensing system comprises a reducing insulating insertion body, a distributed circular conductive array probe and relevant speed measurement electrodes which are inlaid in the insertion body. The method for optimizing the size of the distributed circular conductive array probe comprises the following steps that fluid in a vertical pipeline is divided into regular hexahedral elements according to the mapping mesh generation method; then, the other solid part is divided according to the free division method; the sensitivity distribution of the circular conductive array probe is obtained by changing the properties of materials of the elements obtained by dividing the fluid, namely by converting low specific resistance into high specific resistance; the geometric dimension of the circular conductive probe is optimized. By the adoption of the method for optimizing the size of the key part of the two-phase-flow annular space lumped sensing system, a sensor sensitive field which is more reasonable and regular can be provided.

Description

[0001] Technical field [0002] The invention relates to a size optimization method for key components of a two-phase flow annular space lumped sensing system. Background technique [0003] 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. ...

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Problems solved by technology

[0005] However, due to the serious slippage effect between oil and water phases with low flow rates and high water content, the dispersed phases are non-uniformly distributed and have random motion characteristics, 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

[0006] 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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