特高含水油藏不同井网流场调整模拟与驱油效率

doi:10.13809/j.cnki.cn32-1825/te.2023.04.014

摘要/Abstract

摘要：

流场调整是注水开发油田特高含水后期挖掘剩余油的有效手段。注水开发油田进入高含水开发期后，油水井间逐步形成优势流场，注入水无效循环，降低油藏开发效果。根据流场调整的工作原理，利用Python语言进行编程，建立由标准行列式井网排列为基础的流场调整模型，并进行网格划分，分别将井网流场流线转变角度27°、45°，采用有限差分方法，对流场调整前后的优势流场范围进行二维数值模拟，得出九点法和五点法调整井网模拟显示驱油效率高，M形井网驱油效率相对较低，转流线调整45°效果较好。上述流场调整模拟效果对井网调整提高高含水油藏原油采收率具有一定参考价值。

关键词: 高含水油藏, 井网调整, 流场调整模拟, 驱油效率, 采收率

Abstract:

The adjustment of the flow field proves to be an effective way for enhancing the recovery of remaining oil during the high water cut development stage in a water-flooding oilfield. As the water flooding oilfield enters the high water cut development stage, a dominant flow field gradually forms between oil and water wells, resulting in the ineffective circulation of injected water. As a result, the effect of reservoir development is reduced. To address this issue, a flow field adjustment model is established based on standard determinant well pattern arrangement using Python programming language, guided by the working principle of flow field adjustment. In this model, the flow field streamlines transition angles are 27°, and 45° respectively. The finite difference method is employed to simulate the dominant flow field range before and after the adjustment. The results demonstrate that the nine-spot method and the five-spot method could enhance the oil displacement efficiency, while the flooding efficiency of the M-shaped well-mesh is relatively low. Moreover, the 45°-streamline transition proves to be particularly beneficial for oil exploitation during the high water cut development stage in a water-flooding oilfield. The study holds significant guiding significance for adjusting the well pattern and enhancing the recovery efficiency, thereby facilitating the extraction of remaining oil in the high water cut development stage.

Key words: high water cut reservoirs, well pattern adjustment, flow field adjustment and numerical simulation, oil displacement efficiency, recovery efficiency

中图分类号:

TE327

杨冰,傅强,官敬涛等. 特高含水油藏不同井网流场调整模拟与驱油效率[J]. 油气藏评价与开发, 2023, 13(4): 519-524.

Bing YANG,Qiang FU,Jingtao GUAN, et al. Oil displacement efficiency based on different well pattern adjustment simulation in high water cut reservoirs[J]. Petroleum Reservoir Evaluation and Development, 2023, 13(4): 519-524.

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方案	采液速度/ %	全区产液量/ （m³/d）	平均单井产液量/ （m³/d）	15 a末累油量/ 10⁴ t	15 a末采出程度/ %	15 a末含水率/ %
原井网	24	1 800	138.5	129.0	46.90	99.991
五点法	24	1 800	200.0	134.6	48.96	99.586
九点法	24	1 800	200.0	134.7	48.97	99.577
M形	24	1 800	42.9	133.6	48.56	99.615