DEVELOPMENT OF A CORROSION MONITORING REGULATION FOR DOWNHOLE EQUIPMENT OF GAS-CONDENSATE FIELDS
DOI:
https://doi.org/10.31471/1993-9868-2026-2(46)-173-182Keywords:
corrosion monitoring; gravimetric method; coupon specimen; electromagnetic defectoscopy; corrosion rate; monitoring regulation; diagnostic performance.Abstract
This article aims to establish methodological principles and a periodicity regulation for monitoring the corrosion of downhole equipment and wellhead assemblies in gas-condensate wells, ensuring the timely detection and prevention of corrosion-related failures. The main groups of corrosion monitoring methods are categorised – including diagnostic methods, sensor-based corrosion rate measurement, assessment of physicochemical environmental parameters, and analysis of equipment failure statistics – and their interrelationship within the 'design–operation–management' cycle is demonstrated. The gravimetric method of determining corrosion rates based on mass loss from cylindrical coupons installed on tubing couplings at 500-metre intervals for at least 30 days is examined in detail, and calculation formulas are presented for corrosion penetration rates, critical wall thicknesses of production string pipes, and predicted well service lives until the control pressure test. A quantitative assessment of the diagnostic performance of the operational monitoring indicator, the iron ion content in produced water, was carried out for the first time by comparing gravimetric results with a dataset of 21 wells. At the criterion Fe ≥ 100 mg/dm³, the sensitivity for detecting wells with a corrosion rate ≥ 0.1 mm/year was found to be 67%, the specificity 83%, and the overall agreement 76% (Fisher’s exact test, p = 0.032). It was shown that one third of wells with an unacceptable corrosion rate were not detected by the iron content criterion. This quantitatively substantiates the impossibility of basing a regulation on a single operational indicator. A monitoring regulation with a differentiated control frequency for each method was developed and a criterion for inhibitor protection efficiency was substantiated, based on a final corrosion rate of no more than 0.1–0.15 mm/year.
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