边底水油藏提高采收率技术效果数值模拟研究——以吐哈红南油田为例

Study on Numerical Simulation of Oil Recovery Technology to Improve the Effect of Edge and Bottom Water Reservoir——As Tuha Hongnan oilfield an example

红南油田属于边底水油藏,于1996年投入开发,以衰竭式开发为主.经历长期稳产及加密调整开发后,2008年开始边底水锥进速度加快,含油面积快速收缩,油田产量大幅递减,亟待采取应对技术措施.拟以油藏工程理论为指导,以数值模拟方法为技术手段,以正交试验原理安排实验方案,对比了衰竭式、注入井作业(包括空白水驱开发及注入井凝胶调驱后聚驱开发)及注入井-油井联合作业(即注入井-油井共同凝胶调驱后聚驱开发)等不同开发方式对目标井组开发效果的影响.结果表明,对于含水率较高的边底水油藏,衰竭式开发效果好于水驱的开发效果;聚合物凝胶可以很好地控制边底水锥进,增强驱油效果;与水井单独控制边底水锥进措施效果相比较,水井-油井联合作业可以取得更好的技术经济效果.

Hongnan oilfield belongs to an edge and bottom water drive reservoir. It was put into production in 1996, mainly with the natural depletion production. Through a long-term stabilized production and infill development the coning speed of edge and bottom water began to accelerate in 2008, with rapid contraction of oil-bearing area and substantially declining of oilfield production, which need be took technical measures urgently. As reservoir engineering theory being guide numerical simulation method being technical means and the principle of orthogonal test to arrange experimental scheme, this paper compared the development effect of the target well group in different development program, which included the natural depletion, injection well separate operation （including water flooding and polymer flooding after gel flooding adjustment of injection well） and joint operation of injection well together with oil well （i.e. polymer flooding after gel flooding adjustment of both injection well and oil well）. The results show that, for the edge and bottom water reservoir with high water content effect of natural depletion development is better than that of water flooding, polymer gel can be better control edge and bottom water coning to improve oil displacement effect and joint operation of injection well together with oil well can achieve better technical and economic effect comparing with that of injection well separate operation to control edge and bottom water coning.