英买2缝洞型油藏注水及注气提高采收率研究

Water Injection and Gas Injection to Enhance Oil Recovery in Yingmai 2 Fracture-vuggy Reservoir

针对英买2缝洞型油藏大量剩余油未被采出问题,基于典型储层结构组合特征制备了可视化物理模型,开展了注水和注气等不同开发方式的提高采收率物理模拟实验研究。通过对比不同阶段的含水率和采收率,定量分析了不同开发方式对英买2缝洞型油藏剩余油的动用效果;利用制备的裂缝孔洞模型和断溶体模型,研究底水驱后注水、注气和气水交替开发方式的可行性,并明确了进一步提高英买2缝洞型油藏采收率的合理注采方式——低注高采注水驱油方式、高注低采注气驱油方式以及气水交替注入方式,其中,气水交替可较大幅提高原油采收率。研究结果可为英买2缝洞型油藏进一步提高采收率提供支撑。

In order to solve the problem that a large amount of remaining oil has not been produced in Yingmai 2 ultra-deep fractured cavernous reservoir,a visual physical model is prepared based on the characteristics of typical reservoir structures,and physical simulation experiments of EOR with different development methods such as water injection and gas injection are carried out.By comparing the water cut and recovery efficiency at different stages,the effects of different development methods on residual oil production in Yingmai 2 fracture-vuggy reservoir are quantitatively analyzed.The feasibility of alternate development modes of water injection,gas injection and gas water after bottom water flooding is studied by using the prepared fissure-hole model and fault solution model,and the reasonable injection and production modes to further improve the recovery efficiency of Yingmai 2 fractured-vuggy reservoir are as follows:low injection and high production water injection,high injection and low production gas injection and alternate gas injection.Among them,gas-water alternation can greatly improve oil recovery.The research results can provide support for further enhancing oil recovery in Yingmai 2 fracture-vuggy reservoir.