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Comprehensive Treatment Technology for Downhole Complex Problems in Old Oilfields and Its Application Effect

Author(s)

Xiaoning Cheng

Affiliation(s)

CCDC Changqing Down Hole Technology Company, Xi'an, China

Abstract

Old oilfields have entered a stage of high water cut and high recovery, characterized by complex downhole problems such as casing damage, crossflow, and blockage. Traditional single-treatment technologies have significant limitations. This paper proposes an intelligent integrated treatment technology system that integrates big data, artificial intelligence, and digital twins to address the complex downhole challenges faced by high water-cut old oilfields in my country, including reservoir blockage, casing damage, and inter-layer interference. The system achieves precise diagnosis through multi-source data integration, machine learning, and digital twins; it develops core technologies such as integrated wellbore repair and reservoir-based collaborative unblocking and permeability enhancement, and supports dynamic optimization processes based on big data. Field applications show that this system achieves a 267% increase in oil production, 12 months of recurrence-free casing repair, and a 15 percentage point reduction in water cut in typical wells, significantly improving single-well productivity and the effectiveness of treatments while reducing operating costs. This system represents a shift from "segmented treatment" to "systematic rehabilitation" in the management of downhole problems in old oilfields, providing key technical support for the precise and intelligent development of secondary development of old oilfields.

Keywords

Old Oilfield; Complex Downhole Problems; Integrated Treatment Technology; Well Workover Operations; Application Effects

References

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