Characteristic and Mechanism Research of Water Flooding of
Strong Edge Bottom Aquifer Fractured-vuggy Reservoir

doi:10.11885/j.issn.1674-5086.2012.12.10.02

Abstract

Abstract:

The carbonate fractured-vuggy reservoir in part of the high productivity wells of Tahe Oilfield have the typical
characteristic：when the water cut is zero，oil production remains stable. Once the water cut is not zero，it will rise dramatically，
and oil production will drop fast. Therefore，the water cut of high production wells will influence the oilfield’s production. By
analyzing the production performance of the high production wells with water cut，we found out the signal of water flooding.
And by using the well node analysis method and the fluid mechanics software，we launched a strong edge，bottom water coning
mechanism research and demonstrated the signal before the water flooding. The research comes to the conclusion that the energy
replacement of strong edge or bottom water in fracture cave unit can be divided into three obvious stages：pure elastic drive
transaction of the elastic displacement to water flooding，pure edge bottom water drive. The oil pressure and the production
fluctuation was the important signals of strong edge bottom water flooding and can accurately predict the bottom-water coning
stage. On this basis，we suggested water flood risk warning and control method at the three stages. The analysis of the signals
of high production wells before water flood can be the basis of high production well management and water flood risk warning.

Key words: Tahe Oilfield, fractured-vuggy reservoir, cross flow, high production well, water flood risk warning

Li Xiaobo1*, Rong Yuanshuai1, Long Xibin1, Wu Feng2, Wang Keke2. Characteristic and Mechanism Research of Water Flooding of
Strong Edge Bottom Aquifer Fractured-vuggy Reservoir[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2012.12.10.02.

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