Decomposition method of influencing factors of oil production decline rate in water drive reservoirs——By taking the application of Jinzhou 9-3 oilfield and Bohai oilfield as the example

Based on the decline rate definition, the relationship between oil production decline rate and comprehensive water cut, oil recovery rate, water cut rise rate and change rate of liquid yield was established, and a decomposition method of influencing factors of oil production decline rate was proposed.Through this method, the contribution of each factor to oil production decline rate can be quantified, and the main influencing factors of oil production decline rate can be defined, which can provide a basis for the next adjustment and measures to slow down the decline. The example shows that the method can meet the demand of the actual liquid yield and has the characteristics of simplicity, convenience and maneuverability, and and it is easy to be popularized and applied in the field.