Study On The Evaluation Of Pressure System Of Sazhong Oil Field By Water Flooding

The size of the formation pressure can direct reaction formation energy,determines the stand or fall of oilfield development effect, and the length of the development of life. Accurate grasp of the changes of formation pressure and production parameters, are helpful for further development adjustment, improve the oil recovery. According to the basic principles of reservoir engineering, oil reservoir should guarantee the formation pressure is slightly higher than that of saturation pressure, because after the formation pressure is lower than the saturation pressure,dissolved gas will be a large amount of precipitation, crude oil viscosity increases sharply, leading to oil recovery greatly reduced. For determining reservoir, a large number of remaining oil distribution in thin reservoir or property in the poorer parts of pore throat, crude oil viscosity increases after degassing are less likely to flow, the effect is more obvious. This article is aiming at development zone in Mr Producing gas-oil ratio in recent years continue to rise, stratigraphic peeling level continues to increase, leading to oil recovery greatly reduced, and the effect of water drive measures fell sharply, far short of expectations, water cut rising faster at the same time,increases the liquid water cut is high, the solution can not meet the production effect,and a series of production problems and the relationship between the formation pressure system. Emphasizes on development zone in the stress level at present,evaluate the block pressure difference, and injection-production ratio about formation pressure recovery, water injection, the relationship between the formation pressure flow pressure change and the liquid producing capacity, moisture content, the relationship between recovery rate were studied. Combination of research and practice achievements both at home and abroad, finally confirmed a good water-cut stage reservoir development zone in the reasonable pressure system of the given each block reasonable pressure line, in order to realize water drive smooth and orderly,reasonable and efficient development lay the foundation.