Method for measuring geometrical shape of stratified interface of two-phase flow

Abstract

The invention relates to a method for measuring a geometrical shape of a stratified interface of a two-phase flow. The method is used for measuring the form of the stratified interface with conductivity difference. An adopted parallel line array sensor comprises two groups of parallel line electrodes, wherein one group of the parallel line electrodes are distributed on the cross section of the same pipeline on the upstream and are exciting electrodes, the other group of the parallel line electrodes are distributed the cross section of the same pipeline on the downstream and are receiving electrodes, the exciting electrodes and the receiving electrodes on the opposite positions form paired parallel line electrodes, and each electrode is fixed on a fixed component and penetrates through a horizontal measurement pipeline. The method comprises the following steps: determining the geometrical dimension of the parallel line array sensor on the premise that the form of an oil-water stratified interface is not damaged by the parallel line array sensor; sequentially measuring each line electrode pair, so as to collect a frame of measurement data; and calibrating measurement respond of the parallel line array sensor by virtue of the distribution of static stratified gas and water phases in the horizontal measurement pipeline.

Description

technical field [0001] The invention relates to a parallel line array sensing system for measuring the shape of a two-phase flow layered interface Background technique [0002] With the long-term development of oil wells, most of my country's on-road oil fields have entered the stage of low liquid production. Fluid production profile logging technology is an important supporting link for horizontal well production. Accurately interpreting fluid production profile data is a prerequisite for evaluating oilfield output energy, and is also an important factor for optimizing production plans and performing fracturing and water shutoff operations on oil wells. guidance material. However, under the condition of low liquid production, the unique non-uniform layered flow structure of oil-water two-phase flow appears in horizontal wells, which brings great difficulties and challenges to the interpretation of horizontal well production profile logging data. [0003] Considering the p...

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Problems solved by technology

However, since the two sensors are located in two different radial sections of the pipeline, and the oil-water layer interface fluctuates in the axial direction, the error in estimating the shape of the oil-water layer interface using the measurement responses of the two sensors is large; The sensitive area of ​​the ring-shaped conductivity sensor is not limited to the vicinity of the pipe wall, the two-phase movement of oil and water in the pipeline will also cause the response fluctuation of the double-ring conductivity sensor, resulting in unpredictable measurement errors

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