Corrosion rate correction method for the whole geothermal process

Abstract

The invention relates to a method for calibrating the corrosion rate of the whole geothermal process, the steps of which are as follows: S1. Determine the position of the key node according to the type of the geothermal development system; S2. Calculate the corrosion rate of the corrosive gas at the key node; S3. According to the corrosion rate Calculate the consumption rate of the corrosive gas according to the corrosion rate of the corrosive gas; S4, calculate the partial pressure of the remaining corrosive gas at each key node according to the consumption rate of the corrosive gas; S5, according to the partial pressure of the corrosive gas obtained in step S4 , repeat step S2, update the corrosion rate of corrosive gas at each key node, and calculate the corrosion rate variance E according to the corrosion rate of corrosive gas calculated twice in the whole process V , if E V <1%, the correction is completed, otherwise, according to the updated corrosion rate of the corrosive gas, repeat steps S3-S5, iteratively calculate the corrosion rate of the corrosive gas until E V <1%, complete the calibration. The invention improves the accuracy of corrosion risk prediction in the whole process.

Description

technical field [0001] The invention belongs to the technical field of anticorrosion of geothermal pipelines, and relates to corrosion risk prediction technology, in particular to a method for calibrating the corrosion rate of the whole geothermal process. Background technique [0002] Geothermal energy is a new type of clean and renewable energy, with abundant reserves of recoverable geothermal energy, and the scale of mining and utilization of medium and low temperature geothermal resources is increasing year by year. During the development and utilization of geothermal water, it is necessary to adopt a complete production well-surface pipeline-heat exchanger-surface pipeline-reinjection well process in order to deal with the problems of reservoir pressure deficit and geothermal water disposal after heat extraction . [0003] Corrosion is a common problem in geothermal systems. In production wellbores and surface pipelines, mainly CO 2 Corrosion, where corrosive ions and...

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Problems solved by technology

[0004] The present invention aims at the above-mentioned problems such as the poor accuracy of corrosion risk prediction existing in the prior art, and provides a method for calibrating the corrosion rate of the whole geothermal process based on the electrochemical principle considering the consumption of corrosive gas, which can correct the corrosion rate in the whole geothermal process according to the consumption of corrosive gas. Correct the corrosion rate of pipes to improve the accuracy of corrosion risk prediction in the whole process

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