Conductance tracking correlation method for downflow well flow measurement

Abstract

The invention relates to a conductance-tracer relative method which is applied in injecting well flow quantity measurement, which mainly solves the problems that in the injecting well flow quantity measurement field, the existing measuring methods have some limitation on application. The method is characterized in that the method comprises the following steps: manually measuring through adding external destabilization in single-phase flow which is injected in a well, utilizing a marked solution releaser to release marked solution with high electric conductivity in liquid, the marked solution moves with liquid to flow to an up stream and a down stream sensor pair, diffused non-uniformity can form detectable hydrodynamic noise in the process of moving with liquid, hydrodynamic noise signal of a sensor can have excellent similarity as time variety tendency in sensitive areas of two sensor pairs, thereby achieving the purpose of utilizing conductance type relative flow quantity sensor to measure the flow quantity of injecting water. The conductance-tracer relative method has the advantages of low production cost, low starting output volume, excellent repeatability and uniformity, which has no movable members and blocking element, and has no radioactive pollution.

Description

Technical field: [0001] The invention relates to a flow measurement method in the field of oil field logging, in particular to a method for realizing flow measurement in injection wells by using cross-correlation flow measurement technology. Background technique: [0002] Currently used in injection well flow measurement mainly include isotope tracer method, isotope tracer correlation method, turbine flowmeter, electromagnetic flowmeter, ultrasonic flowmeter, pulse neutron oxygen activation instrument, etc. These methods and instruments have been widely used in the injection profile measurement of general injection wells and layered injection wells, and are suitable for media such as water and polymer solutions. However, there is radioactive pollution in the isotope tracer method and isotope tracer correlation method; the movable parts and flow blocking elements of the turbine flowmeter are easily stuck by quicksand or dirt in the well; electromagnetic flowmeter, ultrasonic ...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the existing measurement methods in the field of injection well flow measurement have some application limitations, the present invention provides a conductance trace correlation method applied to injection well flow measurement. Under certain conditions, the measurement of low injection volume can be realized, and it has the characteristics of low cost, no moving parts and flow blocking elements, low start-up displacement, no radioactive pollution, good repeatability and consistency, etc.

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