摘要
针对新疆油田低渗透油藏储层物性差、注水开发效果差等开发难点,结合二氧化碳埋存发展趋势,探讨了二氧化碳驱油提高采收率及埋存的可行性。以新疆油田八区克上组油藏为例进行油藏数值模拟,在对典型油藏开发历史和动态资料深入分析的基础上,通过油藏流体拟合、细管实验数值模拟及水驱历史拟合,建立基础预测模型,并对开发方式、注气参数及生产工艺进行了优化。结果表明:模拟预测油藏最小混相压力为18.6 MPa;二氧化碳能够有效波及到常规水驱无法波及到的区域,采用水气交替的注入方式埋存系数为0.146,比连续水驱提高采收率12.42%,比二氧化碳连续驱提高3.33%;总注气量对水气交替开发效果影响最为显著;采用关层气油比控制能够更有效地扩大二氧化碳波及体积,进一步提高二氧化碳埋存量和采收率,比采用关井气油比控制的埋存系数提高2.7%,提高采收率3.07%。
In response to the development difficulties in Xinjiang oilfield, such as poor reservoir properties of low permeability reservoir and poor performances in water flooding, this paper explores the feasibility of using carbon dioxide flooding to enhance the oil recovery and realize the sequestration. The Baqukeshangzu oil reservoir is taken herein for example, and the numerical reservoir simulation is conducted. The prediction model is established based on the fully understanding of typical reservoir development history and its dynamic information by fluid fitting, slim tube test simulation and water-flooding history matching. Besides, the development model, gas-flooding parameters and technologies are optimized respectively. The results show that the minimum miscibility pressure of the res ervoir is 18.6 MPa. The carbon dioxide can sweep the area effectively where the conventional water flooding cannot. The sequestration coefficient for the water alternating gas displacement(WAG) is 0.146, which is 12.42% higher than that for water flooding, and 3.33% higher than that for carbon dioxide continuous flooding. The most significant factor that influences WAG efficiency is total gas injection volume. By using control condition to shut down the layers, the sweeping volume of CO2 is expanded, the oil recovery and sequestration capacity are also improved. Its oil recovery is 3.07% higher than that for using control condition to shut down the wells, and its sequestration coefficient is 2.7% improved.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2013年第5期79-83,83+116,共5页
Petroleum Geology and Recovery Efficiency
基金
国家"973"项目"二氧化碳减排
存储和资源化利用的基础研究"(2011CB707302)
国家科技重大专项"大型油气田及煤层气开发"(2011ZX05016)
国家科技重大专项"复杂油气田地质与提高采收率技术"(2011ZX05009)
国家自然科学基金委员会"超低渗透油藏注气提高采收率理论与技术研究"(U1262101)
关键词
提高采收率
低渗透油藏
二氧化碳驱
埋存
波及体积
新疆油田
enhanced oil recovery
low permeability reservoir
carbon dioxide flooding
sequestration
sweeping volume
Xinjiang oilfield
