Development and Application of Integrated Injection System for Injection and Profile Control in Dagang Oilfield

Abstract Dagang Oilfield is a heterogeneous, multi-layered, and structurally complex fault block oil reservoir. During the production process, the contradictions between layers and within layers are becoming increasingly prominent. Split injection and profile control are two important development processes for ensuring production and increasing production in current oilfield development. However, during the construction process of split injection wells for profile control, there are often problems with plugging agents, which affect the effectiveness of split injection and the success rate of testing and adjustment, and even require well repair operations. This has become a key quality control production link that affects the efficiency of oil recovery construction and the improvement of quality, cost, and efficiency. The idea of developing a new type of integrated water distributor for injection and profile control has been proposed, which can achieve dual functions of layered water injection and profile control using a set of pipe columns. Through several years of technological breakthroughs, technological breakthroughs have been made in various aspects such as main structure design, anti backflow structure design, and water nozzle optimization design. Innovative proposals have been made and the integrated water distribution device structure design for injection and profile control has been successfully developed, fundamentally solving the pain points and difficulties of low measurement and adjustment rate after injection well profile control construction, significantly improving the qualification rate of measurement and adjustment, and significantly improving work efficiency and construction quality.