苏北盆地复杂小断块油藏注CO2提高采收率技术及应用

针对苏北盆地复杂小断块油藏"碎、小、低、薄、深"的地质特征以及"三低、三高"的开发特征,探索形成了CO2驱/吞吐室内物模实验、CO2驱/吞吐适宜度评价、CO2驱方案设计与适时优化调整、CO2驱混相判识和CO2驱开发效果评价等5项开发技术,以及采集、净化、集输、注入、采油、回收等6项配套工艺技术。在低油价形势下,围绕成本和效益2个关键因素,通过深入研究和技术进步,将注CO2提高采收率技术的应用范围从低渗透油藏逐步扩大到中高渗透油藏,从单一驱/吞吐向组合驱/吞吐发展,为苏北盆地稳产上产和效益开发提供了有力的技术支撑。

EOR technology and application of CO2 injection for small complex fault block reservoirs in Subei Basin

Based on the geological characteristics of"fragmentary,small,low,thin and deep"and the development characteristics of"three low and three high"of the small complex fault block reservoirs in Subei Basin,five development technologies are formed including the laboratory physical simulation experiment and suitability evaluation for CO2 flooding/huff and puff,the scheme design and optimization,miscible identification and development result evaluation for CO2 flooding. In addition,totally 6 supporting technologies of collection,purification,gathering and transportation,injection,oil production and recovery are formed. Under the situation of low oil price and by focusing on the two key factors of cost and benefit,the CO2 EOR method applied in low permeability reservoirs is extended to the medium-high permeability reservoirs,and also developed from single flooding/huff and puff to combination of them,which provides strong technical support for stable and increasing production and effective development in the old fields of Subei Basin.