Experimental Study on Nitrogen-Assisted Gravity Drainage in Karst Reservoirs of Different Genesis

doi:10.7657/XJPG20230514

Abstract

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

CLC Number:

TE357

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

Figures/Tables 5

Fig. 1.

Fig. 2.

Table 1.

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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