Study On Influencing Factors Of Polymer Flooding Development Index And Development Index Prediction In X Block

Polymer flooding technology has become one of the main methods of tertiary oil recovery in China.There are many factors which affect the development effects of polymer flooding.Therefore,it is necessary to study the main factors and carry out the dynamic prediction of polymer flooding stage.According to the static classification criteria of the single well and welll group,the wells of the X block are divided into four types: A,B,C and D.After analyzing the actual production data of the different wells,the change rules of the development index of the classification wells were obtained.The influence of various factors on the development index was studied by Eclipse software.Combined with the gray relational theory,the impact of factors were analyzed,the weight of the main influencing factors were given.Using the growth curve method establish the model of water content and the change of oil production.The classification wells' s water content and oil production in were predicted.According to statistical analysis of the actual data and results of numerical simulation,the following conclusions are drawn:(1)Permeability,polymer flooding control degree,polymer dosage and oil saturation are the main factors which affect the change of the rate of water content in polymer flooding stage;(2)The main factors of the recovery stage were the polymer dosage,the oil saturation;(3)The main factors of oil increment are the polymer dosage,the polymer flooding control degree;(4)Deposit poly rate of A and B wells decreased slowly,C and D wells decreased rapidly,and the increment oil per ton of polymer increased gradually,and become steady when reached the low time period and the recovery period;(5)The injection pressure of the wells is mainly increased in the decline time period and low value period,and the injection pressure increases slowly and tends to be stable;(6)Injection capacity are different,A wells and B wells are higher,D wells is lowest;(7)In the initial stage of injection the injected polymer is mainly used to supplement formation deficits,A wells and B wells tend to balance when water content began to enter recovery period,and C wells and D wells have failed to achieve balance;(8)The prediction model of oil change and water content were established by using the growth curve method.