关键词: 厚油层；注水开发；射孔调整；调整时机；水驱机理模型 

Abstract: Targeted at the problems of uneven vertical water flooding and gradual deterioration of development effect in the reservoirs of block B in G Oilfield with thick oil layers during water flooding，and combined with the actual geological parameters，a waterflood mechanism model for thick reservoirs is established. The influence of different perforation adjustment modes and adjustment timing of oil and water wells on the effect of water flooding is simulated and analyzed，and the optimal mode for next step of adjustment is given. Study results show that all oil and water wells should be perforated for production in the waterflood process of reservoirs，and high water-cut layers should be sealed off in time so that production can return to upward layers one by one after oil wells have water breakthrough. The effect of oil-water gravity differentiation should be fully utilized，which not only prevents the rapid formation of preferential channels after oil wells are waterflooded，but also reduces water cut. In addition，large production thickness of oil wells is beneficial to maintain higher oil production rate and better economic benefits，which is worth being applied and popularized. 

Key words: thick reservoir；water flooding；perforation adjustment；adjustment timing；waterflood mechanism model