浅层特稠油油藏氮气泡沫驱主控因素分析  

Controlling Factors for Nitrogen Foam Flooding in Shallow Super-heavy Oil Reservoirs

作　　者：郑强 刘慧卿[2] 高超 李芳[4] 

机构地区：[1]中海油研究总院,北京100027 [2]中国石油大学,北京102249 [3]中国石油天然气勘探开发公司,北京100034 [4]中国国土资源航空物探遥感中心,北京100083

出　　处：《特种油气藏》2015年第1期137-140,158,共4页Special Oil & Gas Reservoirs

基　　金：国家科技重大专项"油田开采后期提高采收率新技术"(2011ZX05009-004-05)和"海上稠油热采技术"(2011ZX05024-005)联合资助

摘　　要：特稠油油藏在蒸汽驱后期往往存在吸汽剖面不均、蒸汽波及体积减小、热效率降低等问题,严重制约了蒸汽驱采收率的提高,而蒸汽驱后转氮气泡沫辅助蒸汽驱能有效提高波及系数,增加蒸汽波及体积。以河南油田某井区油藏参数为基础建立机理模型,在此基础上对特稠油油藏蒸汽驱后转氮气泡沫辅助蒸汽驱各影响因素进行分析,最终通过正交数值实验分析方法确定其主控因素。结果表明,采注比为氮气泡沫辅助蒸汽驱的主控因素,各因素对采出程度的影响程度大小的排序为采注比、注入段塞体积、注汽强度、发泡剂浓度、气液比。研究结果为特稠油油藏蒸汽驱后期最优方案的制订提供了依据。At later stage,steam flooding of super- heavy oil reservoir is often characterized by uneven steam absorption profile,reduced steam sweeping volume,and lower thermal efficiency,which severely restrict the enhancement of recovery. Adoption of nitrogen- foam assisted steam flooding after steam flooding may effectively enhance sweep efficiency and enlarge steam sweeping volume.Mechanical model has been established on the basis of reservoir parameters in a well block in the Henan Oilfield to determine controlling factors for nitrogen- foam assisted steam flooding after steam flooding in super- heavy oil reservoirs. Eventually,orthogonal numerical tests are conducted to determine such controlling factors. According to test results,the most important controlling factor is the injection/production ratio. As far as the contribution to recovery is concerned,these factors can be prioritized as follows: injection/production ratio,volume of the injected plug,steam- injection intensity,concentration of foaming agent and gas/liquid ratio.Relevant research results may provide solid foundation for selection of optimal programs in later stage of steam flooding in super-heavy oil reservoirs.

关 键 词：特稠油 氮气泡沫辅助蒸汽驱 波及系数 驱油效率 正交数值实验 主控因素 

分 类 号：TE345[石油与天然气工程—油气田开发工程]