Research on Casing Damage Prevention and Remediation Techniques in the a Oilfield
DOI:
https://doi.org/10.54097/n6b62613Keywords:
HSJ Oilfield; Casing Well; Corrosion; Prevention and Control Methods.Abstract
The HSJ Oilfield faces increasing casing damage due to geological factors, sand production, stimulation measures, and corrosive environments, particularly in blocks with produced water reinjection and saltwater intrusion. Casing damage disrupts injection-production balance, reduces water drive efficiency, increases operational costs, and hinders stable production. This paper proposes a systematic methodology integrating prevention, accurate identification, graded treatment, and daily management for casing damage wells. A "prevention-oriented" strategy is emphasized, including cathodic protection via deep-well anodes, DPC internal coating with non-metallic wear protection, sacrificial anode short sections, and regular corrosion inhibitor injection. Accurate identification combines engineering logging with dynamic analysis, revising key indicators such as liquid volume, salt content, water cut, and dynamic fluid level. Notably, casing damage does not always cause water breakthrough, and water breakthrough may originate from sources other than the damaged section. Treatment follows a graded approach: for effective seating positions, LEP long-term packers are preferred; for damaged sections, chemical sealing (<100 m), alloy composite patching (100–400 m), or small casing cementing (>400 m) are applied; well pattern reconfiguration via sidetracking is used for challenging cases. Daily management includes comprehensive wellbore treatment (anti-corrosion, anti-scaling, anti-wear), 2-hour performance graph monitoring, ten-day fluid level tests, and strict construction quality control. Application in the HSJ Oilfield has significantly reduced the casing damage rate from 13.6% to 2.1% in water injection wells and decreased the annual number of new casing damage cases, supporting stable production and economic benefits. This integrated approach provides a practical reference for similar mature oilfields facing casing integrity issues.
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