边水稠油油藏水驱后蒸汽吞吐方案设计

PROGRAM OF STEAM SOAK FDR HEAVY OIL RESERVOIR AFTER WATER FLOODING

注水开发多年的具边水的普通稠油油藏的原油粘度高、流度比大 ,加之油藏非均质及边水入侵的影响 ,其注水开发效果较差。到含水高于 90 %时 ,仍有大部分原油未开采出来 ,因此 ,有必要转换开发方式 ,进一步提高采出程度。针对以上问题 ,应用黑油模型和热采模型 ,在对水驱阶段历史拟合和现代油藏工程评价的基础上 ,从筛选标准、吞吐试采产能及吞吐模拟等方面评价了注蒸汽热采的可行性 ,并用正交设计分析方法优选了吞吐注汽参数。结果表明 ,该类油藏由注水开发转为注蒸汽开采 ,可以有效地提高采出程度。这种设计方案为相似类型稠油油藏的开发提供了一套较为完善的借鉴方法。

The development effectiveness of water flooding for the heavy oil reservoir with edge water is poor because of the high oil viscosity, high mobility ratio and the invasion of edge water. In later period of water flooding, the recovery percent of reserves is very low while the water cut gets more than 90%. So it is necessary to change the development scheme for enhancing oil recovery. The history match and modern reservoir engineering analysis on the water drive stage of a fault block in Shengli oilfield are made. This block has edge water, and water injection has been made for more than 20 years. The feasibility of steam soak is investigated by using sieving standard,steam soak pilot production and numerical simulation. The steam injecting parameters are optimized with quadrature analysis method. The result shows that cyclic steam stimulation can enhance oil recovery economically and effectively. This program of steam soak offers a perfect method for the development design of the same reservoirs.