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针对海外油田的开发受到合同时间及资源国的约束,不能按传统的国内陆地开发模式等到开发几十年后再开展聚合物驱的问题,开展了海外油田聚合物驱高效开发策略的研究,主要包括高温油田聚合物驱油体系热稳定性评价方法、高温油田数值模拟用物化参数的确定方法、高温油田驱替剂筛选方法、海外油田高效开发模式等。研究表明,对于海外高温新油田,应该采用“抽真空至空气中氧含量<1mg/L+充氮气15min”的组合除氧方法,数值模拟所用物化参数应该老化120d,驱油体系的黏度与地层原油黏度的比值达到0.8~1.1,采取“空白水驱+先导试验+逐步扩大实施”的开发模式和策略,以减小注聚风险,取得更好的驱替效果。对于海外高温老油田,高含水期聚合物驱先导试验的结果表明,筛选出适合的耐温抗盐聚合物和调剖体系,采用“调剖+注聚”相结合的方案是可行的。
As overseas oilfield development is subject to contractual time and resource constraints, it is not possible to carry out polymer flooding after decades of development according to the traditional domestic land development model. The study mainly focuses on the strategy for highly efficient development of polymer flooding in overseas oilfields, mainly Including high temperature oilfield polymer flooding system thermal stability evaluation method, high temperature oilfield numerical simulation with physical and chemical parameters to determine the method, high temperature oilfield flooding agent screening method, overseas oilfield efficient development mode. The results show that for the new high-temperature oilfield in overseas, the combined oxygen removal method of “evacuation to oxygen content <1mg / L in the air and nitrogen in the air for 15min” should be adopted. The physical and chemical parameters used in the numerical simulation should be aged 120d. The ratio of crude oil viscosity in the formation reaches 0.8-1.1. The development mode and strategy of “blank water flooding + pilot test + gradual expansion of implementation” are adopted to reduce the risk of injection and achieve better displacement effect. For overseas high-temperature oilfields, the pilot-scale test of polymer flooding at high water cut stage shows that it is feasible to select a suitable temperature-resistant and salt-resistant polymer and profile control system using a combination of profile control and injection polymerization .