Study On Variation Of Development Index And Reasonable Production Allocation Of Putaohua Oilfield

Based on the actual production situation,research on variation of development index and reasonable production allocation was studied and generalized the law of production decline and water flooding in Putaohua oilfield.Through the realization of these laws,the Putaohua oilfield was evaluated for the development effect,including the evaluation of the recovery percent of the reserves,the adaptability of the well pattern,the formation pressure and the injection capacity.The corresponding measures of development adjustment are given according to the evaluation results of Putaohua Oilfield.Combining the change of development parameters with development adjustment measures could obtain the residual exploitation potential of Putaohua Oilfield,and provide a basis for the reasonable production allocation of Putaohua Oilfield in the future.The production decline law and water flooding degree of different blocks in Putaohua Oilfield were gave by the common methods of production decline curve law and water flooding development law.Using basic production data,starting from the actual geological conditions of the reservoir,it is found that the well spacing density of each block of the Putaohua Oilfield still has the encryption potential under the current oil price.Different extents of low water injection were found in the old area and peripheral blocks where water flooding was performed,which was also one of the reasons for the decrease in formation energy.On the foundation of the above evaluation results,the adjustment limits of water drive well spacing and conversion to polymer flooding were given from the economy angle.It was recommend that the current reasonable well spacing density was restricted to the economic limit one.The polymer transfer time was determined around water content at 92%by numerical simulation,when the profit was the highest.Under the condition of constant production,this paper proposed a reasonable production allocation model in the oilfield.The model is based on the actual geological data and development data of the reservoir,and aims at the maximum profitability of the oil field under the current oil price.The four oil field blocks are allocated reasonable production according to the established cost sequence,which provides a realistic requirement for the rational production planning of the oil field.