RESEARCH ON EOR IN BOTTOM WATER HEAVY OIL RESERVOIRS BY USING THE "CONNING CONTROL WITH WATER PRODUCTION" METHODOLOGY

The bottom water heavy oil reservoirs have characteristics of low production,water coning,fast increasing of water fraction and rapid decrease of production.In order to increase oil producing interval without water and enhance recovery ratio of bottom water heavy oil reservoirs,the methods of control water coning and production bottom water were put forward.Its principle is that control the balance of oil layer and water layer pressure to achieve the goal of water coning control.The produced water could be injected back into the reservoir after simple processing.By this way,the water coning could be well controlled to lower the water production and the oil relative permeability could be kept at relative high level,at the same time,the reservoir energy maintenance could be achieved and the cost of water well drilling could be reduced.