摘要
渤海油区属于典型的海上稠油油藏,目前水驱采收率不高,聚合物驱提高采收率潜力较大。鉴于海上油田开发平台寿命的时效性和开发投资的风险性,使得海上稠油油藏早期注聚时机和注聚压力特征不同于陆地油田中后期注聚。利用数值模拟手段和油藏工程方法,研究了渤海油区典型常规稠油油藏早期注聚压力特征、注聚时机及其影响因素;利用中心组合实验设计方法,建立了早期注聚压力变化与其影响因素之间的关系式。结果表明:海上稠油油藏早期注聚压力受5个因素影响,影响程度由大到小依次为聚合物溶液粘度、油藏渗透率、注入速度、注聚时机和原油粘度;注聚时机受原油粘度和油藏渗透率制约,原油粘度越大、油藏渗透率越低,注聚时机则越晚,渤海油区稠油油藏早期注聚的合理时机在含水率大于20%以后,极限注聚时机在含水率为10%。
Bohai oilfield is a typical conventional heavy oil reservoir, its water flooding recovery efficiency of this type oilfield is quite low, but the potential is great for polymer flooding. Because of the life limit of offshore platform and the risk of development investment, the offshore oilfield polymer flooding should focus on the word of'early'. The feature of injection of early polymer flooding is different from onshore polymer flooding in middle and later period. Reservoir model was established based on related data of typical Bohai heavy oilfield, and the injection timing and pressure feature were studied by numerical simulation techniques. A mathematical model of injection pressure of polymer flooding with influence factors was constructed, the key influence factors were obtained for injection pressure of polymer flooding, including reservoir permeability, oil viscosity, polymer injection timing, etc. Early polymer flooding injection time exists a critical value, and if injection time was greater than the critical value, the injection pressure would increase significantly. The results can provide reference and technical support for the early polymer flooding application of offshore oilfields.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2013年第5期68-71,115,共4页
Petroleum Geology and Recovery Efficiency
基金
国家科技重大专项"海上稠油高效开发新技术"(2011ZX05024-004)
关键词
海上稠油油藏
聚合物驱
压力特征
影响因素
注聚时机
offshore heavy oil
polymer flooding
injection pressure
influence factor
injection timing
