Gas injection practice and well selection of carbonate fractured-vuggy reservoirs in Tahe oil field
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摘要: 塔河油田碳酸盐岩油藏具有储集体埋藏深、非均质性强、储集空间变化大的特征,储集体类型以缝洞型油藏为主。随着油田的开发,能量和底水问题逐渐成为影响自然递减的主要因素。在水驱采油能力大幅下降的同时,注气提高采收率成为油田开发的重要手段。该文介绍在塔河油田注气过程中通过实践摸索,针对不同类型油藏注气开发的经验及规律,在注气选井原则提出新的认识,为碳酸盐油藏提高气驱效率、指导注气开发拓宽思路和方法。Abstract: The carbonate reservoirs in the Tahe oil field are featured by big burial depth, strong heterogeneity and obvious reservoir space variation, and are mainly of fractured-vuggy type. With the development of oil field, energy and bottom water problems gradually become the main factors influencing natural decline. As the capacity of water drive development is declining sharply, the gas injection development which could enhance oil recovery has gradually become an important means. This paper introduced the practice of gas injection in the Tahe oil field, summarized experience and rules of gas injection development for different types, and came up with some new ideas for well selection. Some ideas and methods for improving gas drive efficiency and guiding gas development for carbonate reservoirs were proposed.
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