哈拉哈塘油田缝洞型油藏自流注水耦合计算模型

A Dumpflood Coupling Calculation Model of Fractured-Vuggy Reservoirs in Halahatang Oilfield

哈拉哈塘油田缝洞型油藏开发中后期需要进行注水替油增产作业,但中国自流注水的相关研究尚处于初步阶段,缺乏完整的自流注水流动模型和开发效果优化设计软件。从部分射开水层、射孔孔眼、水阀和缝洞体等关键局部节点出发,建立了缝洞型水层-缝洞体单元流动模型,对部分射开水层、射孔孔眼和水阀等关键节点采用COMSOL软件进行了流动仿真,将各个节点的流动方程进行联立耦合,建立全系统流动耦合模型,并利用Eclipse软件进行了数值模拟,从整体上进行验证。对比验证结果表明,采用油藏数值模拟方法建立的自流注水数值模拟模型可用于缝洞型储集层自流注水量和地层压力变化趋势的预测,为自流注水优化设计提供参考依据。

Water injection is needed in the middle and late development stages of the fractured?vuggy reservoirs in the Halahatang oilfield.The research on self?flow water injection in China is still in its preliminary stage,lacking a complete dumpflood flow model and a develop?ment effect optimization software.Starting from the key nodes such as partial perforated water layer,perforation hole,water valve and frac?ture?vug complex and so on,a flow model is established for fractured?vuggy water layer-fracture?vug complex unit.The software COMSOL is used to simulate the flow of these key nodes,the flow equations of each node are coupled to establish a system?wide flow coupling model,and the numerical simulation and verification are carried out by using Eclipse.The comparative verification results show that the dump?flood numerical simulation model proposed in this paper can be used to predict the self?flow water injection volume and formation pressure variation trend of fractured?vuggy reservoirs,which could provide references for dumpflood design optimization.