Method for measuring injection allocation well casing external flow through ultrasonic Doppler-correlation method

Abstract

The invention relates to a method for measuring injection allocation well casing external flow through an ultrasonic Doppler-correlation method. The method aims to solve the problems that through an existing method for measuring flow of fluid between an injection allocation well oil pipe and a casing pipe, radioactive injury to constructors is caused and cost is high. The method is characterized by including the following steps that firstly, an instrument is placed downwards above an injection allocation water nozzle on a measurement layer, an upstream ultrasonic probe and a downstream ultrasonic probe simultaneously emit continuous ultrasonic waves into a well, and reflective liquid in a reflective liquid bin is released into the well under power drive; the instrument is moved to a measurement point, when reflective liquid drops flow through a region of the ultrasonic waves emitted by the ultrasonic probes, sound waves are reflected on the surfaces of the reflective liquid drops, and part of reflected waves are received by the upstream ultrasonic probe and the downstream ultrasonic probe; signal processing is conducted on the reflected waves received by the ultrasonic probes; secondly, a single probe completes ultrasonic Doppler flow velocity measurement; thirdly, the dual probes complete ultrasonic related flow velocity measurement. According to the method, cost is low, radioactive contamination is avoided, and environment friendliness is achieved.

Description

technical field [0001] The invention relates to the field of oil field logging, in particular to an ultrasonic Doppler-correlation method for measuring the flow rate outside a distribution well pipe. Background technique [0002] Due to the continuous advancement of fine development of oilfields, the water injection method of water injection wells has gradually changed from layered injection to general injection. Fluid flow between tubing and casing is an issue that needs to be addressed in the injection profile. The main technologies at home and abroad to solve the outflow of injection well pipes are isotope water absorption profile technology, radioactive tracer related technology and neutron oxygen activation energy spectrum water flow technology. Both the isotope water absorption profile technology and radioactive tracer related technologies have radioactive harm to construction personnel and instrument maintenance personnel, and the problem of radioactive environmental...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the shortcomings of the existing method of measuring the fluid flow between the oil pipe and the casing of the distribution well and the high cost of construction personnel, the present invention provides an ultrasonic Doppler-correlation method for measuring the flow outside the distribution well pipe method, the method is low in cost, free of radioactive pollution, and environmentally friendly

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