碳酸盐岩缝洞型油藏高含水单元井组气驱探索与实践

Exploration and practice of gas driving in well groups with high water content in carbonate fractured-vuggy reservoirs

芦海涛 王幼 张准行 程洪 吴慧 马国建 汪辉勇

Lu Haitao Wang You Zhang Zhunxing Cheng Hong Wu Hui Ma Guojian Wang Huiyong

中国石化 西北油田分公司 塔河采油三厂, 新疆轮台 841604

Tahe No.3 Oil Production Plant, SINOPEC Northwest Company, Luntai, Xinjiang 841604, China

塔河油田碳酸盐岩缝洞型油藏具有储集体埋藏深、储层非均质性强、储集空间变化大等特点,可借鉴的经验少,大部分高含水单元现有治理手段有限.为保持高产稳产,迫切需要研究注气提高井组采收率的可行性.在深入调研国内外注气开发、注气机理和影响因素等基础上,开展注气开发物理模拟实验,推导出井组气驱开发的理论模型、注气机理,初步得出井组注气的优选原则.并且通过实例分析进一步论证井组气驱对大尺度缝洞型碳酸盐岩油藏有很好的适应性,为缝洞型碳酸盐岩提高油田采收率、控制递减提供新的思路和方法.

The carbonate fractured-vuggy reservoirs in the Tahe Oilfield are featured by high burial depth, super heterogeneity, various reservoir spaces and so on, with little previous experience resources to draw on and also rather restricted in effective measures available to combat high water cut issues for major well units. In order to keep oil production at a quite high and stable level, we need to do a feasibility study relating to injecting gas between well groups to enhance oil recovery. In this article, relevant theoretical models and mechanism for gas driving in well groups are deduced and the optimizing principles are also introduced through physical simulation experiments, by deeply studying gas injection development situations in China and abroad. Finally, by analyzing some practical cases, it is well-confirmed that gas driving in well groups shows a better performance for large carbonate fractured-vuggy reservoirs and provides new ideas and methods to enhance oil recovery and control the natural declination of such kind of reservoirs.

https://doi.org/10.11781/sysydz2014S1070