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本文描述了水淹轻油油藏应用高压注空气技术的可行性研究、采油机理和为了达到其最高采收率而进行的几项模拟研究。在可行性研究中,进行了燃烧管试验和模拟研究。用水驱过的压碎岩心进行燃烧管试验来观测采油情况。结果表明,可以把高压注空气应用于高含水饱和度轻油油藏。蒸馏过程(高压注空气热效应之一)是该油藏状况下高压注空气的主要开采机理。为了提高采收率,控制注入空气窜流很重要,因为空气早期突破极大地缩短了原油生产期。研究结果显示,除了完井设计,注空气量的调整也能够提高垂向波及效率,并且线性驱动注入井网对提高平面波及效率更为有效。
This paper describes the feasibility study of applying high pressure injection of air to flooded light oil reservoirs, the mechanism of oil recovery, and several simulation studies to achieve its maximum recovery. In the feasibility study, combustion tube tests and simulation studies were conducted. Water-driven crushed cores were used to test combustion conditions. The results show that high pressure injection of air can be applied to high water saturation light oil reservoirs. The distillation process (one of the high pressure injected air thermal effects) is the main mining mechanism for high pressure injected air under this reservoir condition. In order to improve oil recovery, it is important to control the injection of air cross-flow, as early breakthrough in air greatly shortens the production of crude oil. The results of the study show that, in addition to completion design, the adjustment of injection air volume can also improve vertical wave efficiency, and that linearly driving the injection well pattern is more effective in improving plane wave efficiency.