基于模糊数学的凝析气藏开发效果评价方法

Evaluation Method for Development of Gas Condensate Reservoir Based on Fuzzy Mathematics

目前凝析气藏普遍采用衰竭式开发,但适用于凝析气藏衰竭开发效果评价方法较少,针对这一问题,开展了凝析气藏开发效果评价方法研究,选取影响凝析气藏开发效果的关键参数,建立了反映开发效果的生产指标体系,采用了模糊数学理论方法分析了关键参数对开发效果的影响权重,绘制了评价开发效果的理论图版,以实际数据与理论图版曲线的吻合度为评分标准,构建了适用于凝析气藏衰竭开发效果评价的新方法。实例分析表明,该方法能从产能、地层能量、水驱程度、采出程度、井流物组分5个方面全面评价凝析气藏衰竭开发效果,评价结果全面、准确可靠,能够为现场生产提供指导。

At present, gas condensate reservoirs commonly adopt the depletion development mode. However, only a few evaluation methods are suitable for the depletion assessment of gas condensate reservoirs. Targeting this problem, a study on the evaluation method for the depletion effect of gas condensate reservoirs was performed. Key parameters affecting the depletion effect of gas condensate reservoirs were selected to establish a production index system reflecting the development degree. Fuzzy mathematics was used to analyze to which extent key parameters affect the development degree, and a theoretical chart for the evaluation of the development effect was developed. The goodness of fit between the curves from actual data and the theoretical chart was used as the scoring criterion to establish a new method suitable for assessing the development of gas condensate reservoirs through depletion. Analysis using real examples shows that this method can comprehensively evaluate the development of gas condensate reservoirs through depletion from five aspects: production capacity, formation energy, degree of water flooding, recovery, and composition of well. The results are comprehensive, accurate, and reliable, capable of providing guidance for production on site.