Research On The Control System Of Oil Extraction Joint Station Based On PLC

The fractured reservoir in buried hill metamorphic rock is characterized by strong heterogeneity,large fracture dip angle and complex spatial structure.The reservoir development is faced with great difficulties.This paper analyses the geological structure,reservoir lithology characteristics,the influence factors of the production characteristics and the water injection mode in the JZ25-1S oilfield.The similarity criterion of water injection in metamorphic reservoir is based on the theory of similarity,using dimensional analysis method and equation analysis method to obtain the main similar quasi number group in combination with practice.On the basis of this,a three-dimensional physical model is made and the simulation experiment system is designed.Through the laboratory simulation experiment,the fracture type of buried hill metamorphic rock is studied.The influence of reservoir water drive speed,water injection mode adjustment and matrix imbibition on production performance is also discussed.The experimental results show that the reasonable displacement speed is the key to improve the development effect of the fractured reservoir in Qianshan.Compared with the continuous water injection,intermittent injection is of great significance for reducing the water cut rate and improving the initial oil recovery speed,but it is limited to the improvement of the final oil recovery.The non water recovery and the final oil production of the matrix containing oil model are obviously higher than the former,which fully indicates that the imbibition is the main mechanism of water flooding in the dual medium reservoir matrix system.