聚驱控制程度在聚驱方案编制中的应用

克拉玛依油田七东1区克下组砾岩油藏孔隙结构复杂、非均质性严重,目前已普遍处于高含水、高递减,低速、低效的开发阶段,面临着迫切提高采收率的问题。聚合物驱技术正在成为此类油藏提高油田开发水平的重要技术支撑。借助精细三维地质模型细化到单位网格计算聚驱程度,既综合考虑平面连通状况又量化了聚合物驱油层的主要特征;结合岩心实验及相关经验公式,将渗透率进行分级处理,建立了精细三维地质模型;在此基础上,以渗透率为滤波条件,并充分考虑聚合物驱不到的中低渗透层区域影响,利用精细模型网格提取油层孔隙体积及总体积,获得聚驱控制程度。结果表明,利用三维效果表征不同渗透率级别下井网对油层的控制程度,有利于指导聚驱综合调整方案优化,改善砾岩油藏聚驱开发效果。

Application of the controlled degree by the polymer flooding in compiling the flooding program

Kexia-Formation conglomerate reservoirs in East Sub-block 1 of Block 7 in Karamay Oilfield are characterized by the complex pore structure and severe heterogeneity, which have entered the development stage of high watercut, high decline rate, low velocity and low effect, and moreover they are urgent to enhance the oil recovery so far. Polymer flooding technique is becoming the important technical support for enhancing the oilfield development level of this kind of oil reservoir. With the help of the polymer-flooding control degree calculated by refined 3D geological model to the unit grid, the planar connectivity is not only taken into account, but also quantify the main characteristics of the polymer flooded reservoir;integrating with the core experiment and related empirical formula, the permeability was ranked and fine 3D geological model was established. Based on the above, taking the permeability as a filter and moreover fully considering the regional effects of the middle and low permeability layers without flooded by the polymer, the pore volume and total volume of the oil reservoir were extracted by the fine model network, the controlled degree by the polymer flooding was obtained. The research results show that by means of the 3D characterized effects, the control degrees by the well pattern to the oil layers at different permeability levels were characterized, thus the optimization of the polymer flooding program can be beneficially guided and furthermore the polymer flooded development effects can be improved for the conglomerate reservoirs.