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根据二注二采工艺开发方案要求，在大张坨凝析油气田，进行了采出井流物40万m3／d，注采比0．8，注干气32万m3／d的循环注气开采试验。从凝析气藏特点出发，应用多组分模拟软件，HYSIM重点研究了地面工艺系统总体方案的优化技术，井流物采出、计量、混输管线的选择及段塞流的控制；井口能量的合理利用及高压油气分离设计；高压气输送过程中防止水合物的生成及甘醇脱水设计；注气压力的确定及注气设备的选型；高压注气条件下防止水合物冻堵及注气介质的选择；工艺系统的安全及仪表控制等技术问题。
According to the requirements of the second injection and second extraction technology development plan, the Dashangtuo condensate oil and gas field was used to carry out recirculating gas injection with a production well flow of 400,000 m3 / d, injection-production ratio of 0.8 and dry gas injection of 320,000 m3 / d test. Based on the characteristics of condensate gas reservoirs, the multi-component simulation software is applied. HYSIM focuses on the optimization of the overall scheme of the ground-based process system, the selection of well fluid, the selection of mixing and transmission lines, and the slug flow control. The rational use of high pressure oil and gas separation design; high pressure gas delivery to prevent the formation of hydrates and glycol dehydration design; injection pressure determination and gas injection equipment selection; high pressure gas injection to prevent freeze blocking blocking and Note Gas medium selection; process system safety and instrumentation and other technical issues.