冷家油田冷35块注空气提高采收率技术研究

Technologic Research on Air Injection to Improve Oil Recovery in Block Leng 35

特低渗透油藏冷35块的油藏条件符合具备实施注空气提高采收率技术的基本条件和潜力。在试验条件下,最佳注气速度为0.3mL/min,采收率在水驱基础上提高了7.2%。在油藏条件下,气体注入量以0.6PV为宜,采收率可提高8.15%。空气注入时机晚,最终采收率低,因此应尽早转换开发方式,且水气交替注入方式使采收率得到较大幅度提高。试验结果对现场开采提供了有效的技术支持。

The Block Leng 35in ultra low permeability reservoir had the basic conditions for implementation of air injection to improve oil recovery technology and potential of oil production.Under the condition of experiment,the best gas injection rate was 0.3mL/min,and the recovery efficiency increased by 7.2%based on water flooding.Under the reservoir condition,aproper gas injection rate was 0.65PV,the recovery rate could be raised by 8.15%.the At late air injection period,final recovery rate was low,so development method should be transformed as soon as possible.And water alternating gas injection method could significantly improve oil recovery rate.The experimental result provides effective technical support for field production.