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

Abstract

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

CLC Number:

TE327

YANG Bing, FU Qiang, GUAN Jingtao, LI Linxiang, PAN Haoyu, SONG Hongbin, QIN Tingting, ZHU Zhiwei. 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.

Figures/Tables 4

References 21

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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

Oil displacement efficiency based on different well pattern adjustment simulation in high water cut reservoirs

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