A Remote Calibration Method for Downhole Stratification Flow of Intelligent Split Injection

Abstract

The invention discloses a remote calibrating method for the stratified flow of intelligent sub-injection downhole, which comprises the following steps: Step 1) Install two pressure sensors on each downhole intelligent water distributor, and measure the adjustable The pressure in front of the nozzle and the pressure behind the nozzle; step 2) and then calculate the flow rate at the adjustable nozzle of each downhole intelligent water distributor according to the throttling formula; step 3) put all the downhole intelligent water distributors into the well, and pass step 2) The throttling formula calculates the flow rate and establishes an artificial intelligence three-dimensional measurement model; Step 4) After the manual measurement and adjustment is completed, during the long-term normal water injection process, the downhole regularly returns a large number of adjustable nozzle openings, front pressure and pressure difference behind the nozzle The corresponding flow rate is obtained from the artificial intelligence three-dimensional measurement model, and the corresponding flow rate is compared with the standard flow rate obtained by the ground standard flowmeter and corrected to complete the remote calibration.

Description

A remote calibration method for downhole stratified flow rate of intelligent dispensing technical field The invention belongs to oil field water injection technology field, be specifically related to a kind of remote calibration of intelligent sub-injection downhole stratified flow method. Background technique The accurate flow test of the water distributor is the core problem, and needs to work for more than three years in the well. The main ones used are magnetoelectric type and ultrasonic type, which are used to measure the velocity of fluid per unit area. Apply this flowmeter For the underground intelligent water distributor, there are four problems that need to be evaluated, one is the influence of the length of the constant flow pipe on the overall How to integrate the complicated metering circuit part into the whole circuit system, the third is how to solve the measurement and calibration after circuit drift, The fourth is how to measure and calibrate the a...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, to provide a remote calibration method for intelligent sub-injection downhole stratified flow, which overcomes 1 in the prior art: the existing flow meter cannot be used for the intelligent water distributor for long-term work, The reason is that the drift variation of the metering circuit and the constant current tube cannot be accurately measured and remotely calibrated, and the application will cause the downhole stratified flow error to increase year by year; 2. Calculate the flow rate through the pipe flow pressure difference or mouth flow pressure difference , the measurement of mouth flow and pipe flow is carried out under a fixed flow area, and the measurement range is small; 3. The existing technology cannot accurately perform remote calibration and other problems

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