一维两相同向渗吸模型的求解方法

发布时间：2018-03-03 08:53

本文选题：两相流　切入点：非混相　出处：《断块油气田》2017年01期 　论文类型：期刊论文

【摘要】：渗吸作用是裂缝性储层提高原油采收率的重要机理,润湿相在毛细管力、重力的作用下进入储层基质,通过同向或逆向渗吸作用置换基质内的非润湿相。基于渗吸模型的局限性,文中推导了一维两相同向渗吸模型的通式,在相对渗透率曲线和毛细管压力曲线简化的基础上进行无因次化处理,并采用差分法进行了求解,获得了饱和度前缘移动曲线。采用COMSOL软件,对上述模型进行结果验证,并与逆向渗吸模型进行了对比。结果表明:COMSOL求解结果与文中求解结果近似,同向渗吸模型饱和度前缘推进速度比逆向渗吸更快,同向渗吸效率更高,采出原油更多。在裂缝性储层、常规甚至致密储层中,如果采用体积改造,密集切割储层基质,形成裂缝网络,则可发挥同向渗吸作用,提高原油采出程度。
[Abstract]:Permeability and imbibition is an important mechanism for improving oil recovery in fractured reservoirs. The wetting phase enters the reservoir matrix under the action of capillary force and gravity. Based on the limitation of osmotic model, a general formula of one-dimensional and two-in-one homogenous permeation model is derived by replacing the non-wetting phase in the matrix by the same or reverse osmosis, and based on the limitation of the osmotic model, a general formula is derived. Based on the simplification of relative permeability curve and capillary pressure curve, dimensionless processing is carried out, and the difference method is used to solve the solution. The saturation front moving curve is obtained. The results of the above model are verified by COMSOL software. Compared with the reverse osmotic model, the result shows that the solution result of the solution is similar to that of the solution in the paper. The advance speed of saturation in the same direction infiltration model is faster than that in the reverse osmosis model, and the efficiency of the same permeation is higher. In fractured reservoir, conventional reservoir and even compact reservoir, if volume modification is adopted, reservoir matrix is cut densely and fracture network is formed, the same direction permeation can be played and the degree of crude oil recovery can be improved.
【作者单位】：中国石油勘探开发研究院;中国石油勘探开发研究院廊坊分院;新疆油田宇澄热力有限公司;中国石油华北油田分公司采油工程研究院;中国石油渤海钻探井下作业公司;中国石油新疆油田分公司工程技术研究院;
【基金】：国家科技重大专项“大型油气田及煤层气开发”(2016ZX05023)
【分类号】：TE312

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