Determination of Reasonable Production/Injection Ratio in Sanan Development Area at High Water Cut Stage

The first,second and third infill adjustments have been carried out in Sanan development area before high water cut stage.Aiming at the whole block,and based on the combination of material balance principle and Logisitic cycle theory,research on the determination methods for reasonable production/injection ratio has been done: first,determine the relation between pressure buildup velocity and underground injection/production fluids volume difference with the application of material balance method;second,determine the quantitative relation between annual production and annual injection at different water cut;third,research on the relation between pressure buildup velocity and injection/production ratio and water cut.With the application of this method,the reasonable production/injection ratio for Sanan development area during the "10th 5 Year Plan" is determined.Field practice proves that this method can provide the oilfield development adjustments with better guide.