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为了进一步深化认识高压注空气驱油机理,针对试验区块,通过室内实验与数值模拟相结合,开展深入研究。轻质油藏注空气不同于稠油油藏,氧化反应区滞后于气驱前缘,高温氧化热力驱油对采收率的贡献相对较小,且这部分贡献要在较高的注气量下才有所呈现,而较大注气速度容易造成气窜,使反应区难以稳定。初步的驱替实验表明,采用低注入速率的重力稳定驱替,可有效提高采收率。因此,这种厚层块状低渗油藏更适合于顶部注气的低温氧化重力稳定驱替。
In order to further deepen the understanding of the mechanism of high-pressure injection air displacement, aiming at the test block, through in-house experiments and numerical simulation, further study was carried out. The light air injection of light reservoirs is different from that of heavy oil reservoirs. The oxidation reaction zone lags behind the front of gas drive. The contributions of high temperature oxidation and thermal oil displacement to oil recovery are relatively small, and this part of contribution should be at a higher gas injection rate It will appear, and a larger gas injection rate is likely to cause gas channeling, the reaction zone is difficult to stabilize. The preliminary displacement experiment shows that gravity-stabilized displacement with low injection rate can effectively improve oil recovery. Therefore, this thick, massive, low-permeability reservoir is more suitable for low-temperature oxidized gravity-driven displacement of the top gas injection.