摘要
Abstract
During the medium or high water cut stage in Chengdao offshore oilfield, some problems appear such as low oil extraction rate, great controlled reserves per well, serious interference between layers, low liquid quantity per day, incomplete well pattern and so on, which all restrict the exploitation of the oilfield. A study concluded that subdividing series of strata can effectively decrease the interference between layers, fully enhance oil production capacity and improve the use of oil. Infilling well pattern can enhance the degree of controlled reserves and achieve a balanced drive from water to oil wells. Improving liquid quantity can release energy of non-major reservoirs and improve individual well productivity. Through the application of horizontal wells over a single local or bottom flooding reservoir, we can effectively develop the reservoir and improve oil recovery rate. At present, the adjustment measure has been applied. After adjustment, the liquid and oil intensity is increased 2.9 and 1.5 times higher than before, and the injector-producer correspondence is improved by 20.5% , and the water flooding control level is also improved by 16.6%. Moreover, the liquid enhancement is improved over 80% in some wells with liquid enhancement measurement, and the application of horizontal wells significantly increases the productivity. In general, the adjustment effect is remarkable.关键词
中高含水期/综合调整/层系/井网/提液/水平井/埕岛油田Key words
medium to high water cut development/comprehensive adjustment/series of strata/well pattern/liquid enhancement/horizontal well/Chengdao offshore oilfield分类
能源科技
