Method for measuring water content of oil-water two-phase flow of oil well under action of binary chemical liquid

Abstract

The invention relates to a method for measuring water content of oil-water two-phase flow of an oil well under the action of a binary chemical liquid. An arc opposite-wall type conductivity sensor is adopted to measure average water content distributed along a pipe section, an arc exciting electrode and an arc center measuring electrode with opposite space positions are fixed in a small-diameter measuring pipeline after current collection, edge protection electrodes with identical size are arranged on two sides of the center measuring electrode at equal distances respectively, and the axial height of the center measuring electrode is matched with the whole axial height of the combination formed by the exciting electrode and the edge protection electrodes on two sides. By means of a dynamic experiment on the oil-water two-phase flow under the action of the binary chemical liquid, voltage signals output by the arc opposite-wall type conductivity sensor are acquired, and an experiment related chart between measured normalized conductivity value and experiment calibrated water content of the oil-water two-phase flow under the action of the binary chemical liquid is obtained.

Description

technical field [0001] The invention relates to a method for measuring high water content of oil-water two-phase flow under the action of binary chemical flooding of oil wells in the field of dynamic monitoring of oil fields. Background technique [0002] Due to the long-term use of waterflooding in my country's onshore low-permeability oilfields, the oil-water two-phase flow in the wellbore presents the flow characteristics of low velocity and high water cut. In order to enhance oil recovery, tertiary oil recovery technology based on surfactant-polymer binary chemical flooding has been widely used in oil fields. From the perspective of guiding oilfield production, the accurate measurement of flow parameters of oil-water two-phase flow under chemical flooding is of great value to effectively enhance oil recovery and optimize fluid production profile logging technology. [0003] Injecting binary chemical fluid into the formation will significantly change the rheological prop...

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Problems solved by technology

[0003] Injecting binary chemical fluid into the formation will significantly change the rheological properties of oil-water two-phase flow in the wellbore, seriously affect the flow pattern and interphase slippage characteristics of oil-water two-phase flow, and aggravate the non-uniform distribution of dispersed oil phase bubble diameter under the condition of low flow rate and high water cut behavior, which poses great challenges to the accurate measurement of wellbore water cut parameters

Due to the high degree of inhomogeneity in the spatial distribution of the sensitive field and the susceptibility to the edge effect of the electric field, the traditional annular single-pair electrode conductivity measurement method has limited ability to characterize the change of dispersed phase distribution information.

In addition, under the action of binary chemical fluid, the concentration, velocity and bubble diameter of the dispersed phase of oil-water two-phase flow are non-uniform distribution characteristics, and the existing ring conductivity sensor for water content has great limitations in measurement sensitivity and resolution.

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