Remote calibration method for intelligent injection downhole layered flow

Abstract

The invention discloses a remote calibration method for an intelligent injection downhole layered flow. The remote calibration method comprises the following steps that S1, two pressure sensors are mounted on each underground intelligent water distributor, and the pre-nozzle pressure and the post-nozzle pressure of an adjustable water nozzle of each underground intelligent water distributor are synchronously measured; S2, the flow at the adjustable water nozzle of each downhole intelligent water distributor is calculated according to a throttling formula; S3, all the underground intelligent water distributor are put into a well, the flow of each underground intelligent water distributor is calculated through the throttling formula in the second step, and an artificial intelligence three-dimensional metering model is established; and S4, a large number of opening degrees of the adjustable water nozzles, and differential pressure values of the pre-nozzle pressures and the post-nozzle pressures are periodically returned to the artificial intelligence three-dimensional metering model to obtain corresponding flows during the long-term normal water filling process after manual adjustmentis completed, and the corresponding flows are compared with the standard flow obtained by a ground standard flow meter and corrected, so that the remote verification is completed.

Description

technical field [0001] The invention belongs to the technical field of oil field water injection, and in particular relates to a remote calibration method for the stratified flow rate of the intelligent sub-injection downhole. Background technique [0002] Accurate testing of the flow rate of the water distributor is the core issue, and it needs to work for more than three years underground. At present, the conventional applications mainly include magnetoelectric and ultrasonic methods, which are used to measure the velocity of the fluid per unit area. Applying this kind of flowmeter to the underground intelligent water distributor faces four problems that need to be evaluated. One is the influence of the length of the constant flow tube on the overall water distributor, the other is how to integrate the complex metering circuit into the entire circuit system, and the third is the circuit How to solve the measurement and calibration after the drift, the fourth is how to meas...

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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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