海上K油田层内生气调驱技术研究与应用

Research and application of the technology of gas and displacement control in the formation of offshore K Oilfield

针对海上K油田注入压力高、储层纵向吸水不均、高渗储层窜流明显以及常规调剖调驱体系难注入等问题,开展层内自生气调驱技术研究。针对目标油藏条件,对层内生气调驱体系配方以及体系静态性能和驱油能力进行实验研究,实验结果表明:室内所筛选层内生气调驱体系配方为8%自生气体系+0.5%起泡剂,该体系驱油效率在水驱基础上提高19.1%,具有良好的注入性和调驱性能。通过渤海K油田的现场试验,该技术可大幅降低油井含水率,其中典型见效井含水最高下降13%,最大日增油23.6 m^(3),5个月累积增油4300 m^(3)余方。

In order to solve the problems of high injection pressure,uneven vertical water absorption of reservoir,obvious channeling of high permeability water flow and difficult injection of conventional profile control in offshore K oilfield,this paper studies the technology of self-generation and drive control in the formation of the oilfield.Based on the target reservoir condition,the formula of profile control and flooding system as well as the static performance and oil displacement capacity of the system are experimentally studied,and the formulation of formation profile control and displacement system in the indoor selected intra-layer is determined:8%self-generation system+0.5%foaming agent.The experimental results showed that the system has good injecting and profile control performance,and the oil displacement efficiency is 19.1%higher than that of water flooding.The technology has been successfully applied in K oilfield in Bohai Sea.The maximum water cut of typical effective wells has been greatly reduced by 13%,and the maximum daily oil production has increased by 23.6 m^(3).At present,the validity period of the technology has been up to 5 months and the cumulative oil production has increased by 3000 m^(3).