提高大港油田天然气采收率的方法

METHODS ON IMPROVING GAS RECOVERY IN DAGANG OIL FIELD

随着天然气在一次性能源消费中比例的增加,以及天然气需求量的日益增长,如何近一步提高天然气的开发效果,已成为天然气开发研究工作中的重点。大港油田天然气开发已经有30多年历史,天然气藏类型较多,针对多年天然气资源动用情况及开发现状,进行了深入地分析研究,总结了各种类型气藏的合理开发方式及所达到的预期效果,提出了不同类型气藏应遵循的开发方式:小断块气藏或凝析气藏及低含量凝析气藏以枯竭式开发较为经济合理;对于高含量凝析气藏宜保持压力开发;对于已经投入开发的凝析气藏通过有效降低废弃压力也可以提高采收率。

With increase of natural gas percentage in original energy consumption and of its demand, studies on improving natural gas development efficiency are becoming more and more important. It has been more than thirty years since natural gas development began in Dagang oil field, where there are various types of gas reservoirs. Based on studies and analysis of the exploitation status of gas resources in Dagang Oil Field, this paper summarized reasonable development methods and some expected results for different types of gas reservoir as follows: (1) depletion is economically reasonable for gas reservoir of small fault-blocks, gas condensate reservoir and low-content gas condensate reservoir; (2) pressure-maintenance is applicable for high-content gas condensate reservoirs; and (3) effective reduce of abandonment pressure is also helpful to improve recovery rate of developed gas condensate reservoir.