Strategy and Practice of High Efficient Water Injection in Deep Sea Turbidite Sandstone Oilfield

doi:10.11885/j.issn.1674-5086.2020.03.03.01

Abstract

Abstract: The reservoir characteristics of turbidite channel and lobe in AKPO Oilfield, a deep-sea turbidite sandstone oilfield in the Niger Delta Basin, are analyzed. It also evaluates its dynamic production behavior based on the connectivity of sand bodies between injectors and producers to determine the water injection strategy during the zero water-cut production period. Based on time-lapse seismic imaging, after-breakthrough water control and plugging strategies are established from the flooding characteristics of different reservoir types. Thus, efficient water-flooding strategies at different production stages are constructed. In the zero water-cut production stage, the optimized water injection strategy focusing on controlling pressure is applied based on the connectivity of sand bodies between injector and producers. In the low and medium water-cut production stage, the water injection scheme focuses on increasing sweep efficiency based on sedimentation type. Therefore, hydro-dynamic method is implemented to improve the water-flooding sweep coefficient. Periodic injection scheme is applied for injector-producer well groups in the channel reservoir to increase the vertical sweep coefficient and the areal sweep coefficient for injector-producer well groups in the lobe reservoir is enhanced by changing the fluid flowing direction. In the high water cut production stage, "low-cost" sectional water control and plugging technique suitable for deep sea oilfield is applied to achieve economic and effective production development. Through the practice in the AKPO Oilfield, high efficient water injection strategy has achieved in the deep-sea turbidite sandstone oilfield. The stable production has continued for 7 consecutive years with a peak oil recovery rate at 5.5% and ultimate oil recovery rate at 53%. This water injection optimization strategy has worked well in the AKPO Oilfield and can be implemented to similar deep sea oil fields, which is convenient, economic and effective.

Key words: deep sea oilfield, turbidite sandstone, water flooding, water injection strategy, sweep efficiency

CLC Number:

TE331

YUAN Zhiwang, YANG Li, YANG Baoquan, ZHANG Yingchun, CHEN Xiao. Strategy and Practice of High Efficient Water Injection in Deep Sea Turbidite Sandstone Oilfield[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(2): 117-127.

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