不同成因岩溶储集体氮气辅助重力驱实验

doi:10.7657/XJPG20230514

摘要/Abstract

摘要：

针对塔河油田储集体复杂特点和中—下部剩余油动用难题，结合地质信息和建模结果，构建了考虑储集体类型、裂缝分布及裂缝-缝洞组合关系的储集体剖面模型，开展了表层岩溶储集体、古暗河储集体和断溶储集体的驱替实验，并对油气水多相流动进行可视化分析；研究了氮气辅助重力驱前后的剩余油赋存状态，对比了不同成因岩溶储集体采收率提高程度。结果表明：对于不同成因的岩溶储集体，氮气辅助重力驱均有助于实现均衡驱替，但不同成因岩溶储集体高采收率程度存在差异，断溶储集体、表层岩溶储集体和古暗河储集体原油采收率分别提高12%、9%和7%；有助于明确储集体类型对氮气辅助重力驱的影响，为缝洞型油藏提高采收率技术发展提供支持。

关键词: 塔河油田, 碳酸盐岩储集层, 缝洞型油藏, 岩溶储集体, 氮气辅助重力驱, 剩余油, 提高采收率

Abstract:

The reservoirs in the Tahe Oilfield are complex and the remaining oil in the middle-lower part is difficult to recover. Based on the geological data and modeling results, a reservoir profile model considering reservoir type, fracture distribution and fracture-vug configuration was constructed. This model enables the displacement experiments for surface karst reservoirs, underground river reservoirs, and fault-karst reservoirs, and also the visual analysis of oil-gas-water multiphase flow. The remaining oil distribution before and after nitrogen-assisted gravity drainage (NAGD) was investigated, and the differences in enhanced oil recovery (EOR) for karst reservoirs of different genesis were compared. The results show that NAGD contributes to balanced displacement for karst reservoirs of different genesis, but achieves varying efficiency of EOR - by 12%, 9%, and 7% respectively for fault-karst reservoirs, surface karst reservoirs, and underground river reservoirs. The research findings help to understand the influence of reservoir types on NAGD, providing support to the advancement of EOR techniques for fractured-vuggy reservoirs.

Key words: Tahe oilfield, carbonate reservoir, fractured-vuggy reservoir, karst reservoir, nitrogen-assisted gravity drainage, remaining oil, EOR

中图分类号:

TE357

程洪. 不同成因岩溶储集体氮气辅助重力驱实验[J]. 新疆石油地质, 2023, 44(5): 613-617.

CHENG Hong. Experimental Study on Nitrogen-Assisted Gravity Drainage in Karst Reservoirs of Different Genesis[J]. Xinjiang Petroleum Geology, 2023, 44(5): 613-617.

图/表 5

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储集体类型	驱替方式	采收率/%	含水率/%
表层岩溶储集体	底水驱	39	59
	注水驱	49	77
	注气驱	66	80
	氮气辅助重力驱	75	71
古暗河储集体	底水驱	18	52
	注水驱	27	54
	注气驱	43	56
	氮气辅助重力驱	50	59
断溶储集体	底水驱	31	61
	注水驱	40	77
	注气驱	63	80
	氮气辅助重力驱	75	80