| 不同提液方式对强水驱海相砂岩油藏驱油效率影响的实验研究 |
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| 引用本文： | 李伟,王亚会,陈肖,蒋鏖,杨勇,王伟峰.不同提液方式对强水驱海相砂岩油藏驱油效率影响的实验研究[J].地质科技通报,2021,40(5):301-306. |
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| 作者姓名： | 李伟 王亚会 陈肖 蒋鏖 杨勇 王伟峰 |
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| 摘 要： | 南海东部海相砂岩强底水驱稠油油藏经过多年开发，面临油田综合含水高、采出程度低的问题，油井提液是改善开发效果、实现稳产增产的重要措施，目前国内外关于不同提液方式对驱油效率的影响研究较少。为此，基于PY油田主力油藏典型渗透率级别天然岩心，开展了实际油藏条件下的水驱油核磁共振实验研究，分析了高含水期中不同提液组合方式下驱油效率的变化，从不同孔隙类型的动用程度揭示了影响驱油效率变化的内在因素并优选出适合该类型油藏的提液方式。实验结果表明:在多次控幅提液方式下，较于其他提液方式驱油效率平均提高了6.08%，能大幅提高微孔与小孔的动用程度，孔隙动用程度平均增加了7.76%，提液效果最佳。该成果为海相砂岩稠油油藏制定合理提液技术政策提供了依据。
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| 关 键 词： | 海相砂岩 强水驱 核磁共振 驱油效率 |
| 收稿时间： | 2020-08-09 |
Experimental study on the effect of different liquid extraction methods on the oil displacement efficiency of strong water flooding marine sandstone reservoirs |
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| Abstract: | After decades of exploitation, marine sandstone heavy oil reservoirs with strong bottom water drive in eastern South China Sea shows features of low recovery factor and high water cut.Liquid extraction is an essential measure to increase and stabilize oil production during oilfield development.At present, there are few studies on the change of oil displacement efficiency under the different liquid extraction.For PY Oilfield, typical cores drilled from major oil producing layers were selected to conduct water flooding under reservoir condition by NMR experiments.The displacement efficiency was recorded and studied under different liquid extraction methods.The microscopic mechanism was concluded by analyzing the recovery results inside cores of different permeability types.The results indicate that the increment of oil recovery in micro and medium size pores can be greatly improved under multiple amplitude control liquid extraction in extra-high water-cut period, and the recovery efficiency can be increased by 6.08% compared with other extraction methods, and the extraction effect is the best.The results successfully give guidance to the proper application of liquid extraction methods in the marine heavy oil sandstone reservoirs. |
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