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Tang Xiaoyong,Pu Liming
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Issue:ISSN 1006-5539
          CN 51-1183/TE

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    Your Position :Home->Past Journals Catalog->2024 Vol.2

    Research on water control strategies for fractured reef limestone reservoirs with strong bottom water
    Author of the article:YANG Yong1, LI Fangfang2, SUN Changwei1, CHENG Jia1, LIU Yuanzhi1, JIANG Renkai1
    Author's Workplace:1. CNOOC China Ltd., Shenzhen Branch, Shenzhen, Guangdong, 518054, China; 2. CNOOC EnerTechDrilling & Production Co., Tianjin, 300452, China
    Key Words:Reef limestone; Reservoir classification; Water coning performance; Water control strategies
    Abstract:

    The fractured bottom water reef limestone reservoir is characterized by a well-developed fracture network and a large bottom aquifer. The heterogeneity of the fracture network and the diversity of fracture occurrences complicate water coning in production wells, necessitating adaptive water control technologies. This study uses the Liuhua 11-1 oilfield as a case study, where the reservoir’s microscopic porous structure was categorized into four types based on core descriptions, rock core SEM, and cast rock thin sections. Numerical simulation models were developed to investigate the water coning characteristics of different reservoir types, and various water control methods were evaluated. The results show that distinct water coning behaviors across different reservoir types. Tight-fractured and cave-fractured reservoirs are prone to rapid water coning, leading to early water breakthrough, quick increases in water cut, and swift declines in oil production. Upon assessing the adaptability and effectiveness of existing water control measures, the continuous packer + Inflow Control Device(ICD) approach was found to be efficacious. This method not only fills the fractures but also reduces the flow rate in highproductivity sections to achieve water control balance. This research is of great significance for the efficient development of fractured bottom water reservoir, and provides reference for the water coning and water control method of this type of oilfield.

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