凝析气藏注气开发气窜量化评价方法及应用

在凝析气藏循环注气驱替过程中，受储集层非均质性影响，注入的干气容易沿高渗通道或天然裂缝突进，影响凝析气藏开发效果。研究凝析气藏注气气窜特征，建立凝析气藏注气气窜识别评价体系对改善开发效果和提高油气采收率具有重要意义。目前国内外凝析气井气窜判别方法主要有现场经验法、图版法、示踪剂法、微地震监测法等，针对凝析气藏循环注气生产过程中的气窜参数变化特征，综合利用上述方法对气窜情况进行评价，形成了凝析气藏注气气窜量化评价体系。以某凝析气藏一口实际井为例，对该井的气窜情况进行评价，结果显示该井生产状况良好，未发生气窜，与现场实际情况相符。该凝析气藏注气气窜量化评价体系为凝析气藏的开发部署、优化与气窜防治提供了理论依据。

An quantitative evaluation method for gas channeling in the process of gas injection development of condensate gas reservoirs and its application

When cyclic gas injection is conducted in a condensate gas reservoir, the injected dry gas tends to break through along high-permeability pathways or natural fractures due to reservoir heterogeneity, and consequently its development effect is impacted. To improve the development effect and increase the hydrocarbon recovery factor, it is of great significance to investigate the gas channeling characteristics of injected gas in condensate gas reservoirs and establish the gas channeling identification and evaluation system for the injected gas in condensate gas reservoirs. At present, the gas channeling discrimination methods for condensate gas wells at home and abroad include field experience method, chart method, tracer method, microseismic monitoring method and so on. Based on the variation characteristics of gas channeling parameters during the production of condensate gas reservoir by the cyclic gas injection, the gas channeling was evaluated using above methods comprehensively, and the quantitative evaluation system for the gas channeling of injected gas in condensate gas reservoirs was established. Then, one actual well in a certain condensate gas reservoir was taken as the example and its gas channeling was evaluated. It is indicated that this well is in good production condition without gas channeling. The evaluation result is consistent with the actual field situation. The quantitative evaluation system for the gas channeling of injected gas in this condensate gas reservoir provides the theoretical basis for development deployment, optimization and gas channeling control of condensate gas reservoirs.