Technical Policy Study of Single Well N2 Injection for EOR in Complex Fracture-cavity Carbonate Reservoirs

doi:10.11885/j.issn.1674-5086.2020.04.13.01

Abstract

Abstract: Fractured-cavity carbonate reservoirs in Tahe Oilfield have complex geological conditions and strong heterogeneity. The oilfield test of single well inject N₂ for EOR has been successful, but the effect are quite different between wells due to the difference of each well and the injection and production parameters need further optimized action. In this paper, we propose specific reproduce N₂ injection technology policy for each well in this kind reservoir. Takeing Well TA1 as an example, based on reservoir identification and prediction, we build reservoir development pattern, reproduce reservoir development process and characterize the distribution characteristics of remaind oil; based on the actual reservoir model, we optimize the injection timing, gas injection mode and inject-production parameters. The results show that there are more than 50 000 t of remaining oil in the top cave of Well TA1. N₂ injection can form a secondary gas cap, which can better utilize the attic oil on the top of cave and further improve the recovery degree of the reservoir. We determined the optimal parameters based on the model that the best, injection time is when the water cut is 93%, and best injection mode is gas water mixed injection, cycle gas injection volume is 600 000 m³, gas injection speed is 150 000 m³/d, well soak time is 10 d, and liquid production intensity is 40 m³/d. This technical policy provides important basis for the preparation and implementation of gas injection scheme. After implementation of the plan, the effect of increasing oil is remarkable.It has been applied to other injection wells with different karst background and achieved good results.

Key words: fracture-cavity carbonate reservoir, specific policy for each well, geological modeling and numerical simulation, parameter optimization, technical policy of gas injection

CLC Number:

TE122

Lü Xinrui, Lü Tie, XIAO Fengying, ZHANG Hui, ZHANG Yun. Technical Policy Study of Single Well N₂ Injection for EOR in Complex Fracture-cavity Carbonate Reservoirs[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(2): 101-109.

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Technical Policy Study of Single Well N₂ Injection for EOR in Complex Fracture-cavity Carbonate Reservoirs

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