一种新型层内生气体系的研究与应用

Research and Application of a New In-situ Gas Generation System

针对常用层内生气体系反应速度快、生气效率低的问题,优选出氨基甲酸铵和乙酸的新型层内生气体系,解决了现有技术的缺点,并且评价了该新型体系的深部封堵性能和驱油性能。通过室内评价实验,优选的新型体系配方为质量分数10%的氨基甲酸铵和质量分数10%的乙酸,反应时间为5 min,生气效率为78.7%;深部封堵性能实验表明,新型体系对比常用体系具有缓释效果,作用距离更远,形成更深的封堵;驱油性能实验中新型体系和常用体系的采收率增值分别为27.02%和22.83%,表明新型体系的深部驱油性能更好。现场应用结果显示,措施井实现了降压增注,井组产油量增幅达到44m^(3)·d^(-1),有效期长达153d,累计净增油量达到6 732 m^(3)。

Aiming at problems of rapid reaction speed and low generation efficiency of commonly used in-situ gas generation system, a new in-situ gas generation system with ammonium carbamate and acetic acid was optimized. The new system overcame the shortcomings of existing technologies, and the deep plugging performance and flooding performance of the new system were evaluated by experiments. Indoor experimental results showed that the reaction time was 5 min and the gas generation efficiency was 78.7% when the mass fractions of ammonium carbamate and acetic acid were both 10% which was the optimized formula. Compared with commonly used system, the new system had a slow-release effect, had a longer working distance, and formed a deeper blockage. The new system increased 27.02% oil recovery and the commonly used system increased 22.83% oil recovery in the flooding experiment, which showed that the deep displacement of the new system was better. The field application results showed that the performance of injection well was improved and the oil output of well group increased 44 m^(3)·d^(-1). The period of validity lasted 153 days, which increased 6 732 m^(3) oil output.