Xing District 13 Polymer Flooding Industrial Zones Expand Swept Volume Adjustment Technology Research

Xing district 13 polymer flooding industrial zonesis located in Xingnan Development Area of pure oil region,Area 6.79km2.Xing district 13 reservoir is located in the Mesozoic Cretaceous under the EC in yaojia and qingshankou formation strata,The main development Sa? and Pu?reservoir formation.Pu?3 formation mainly developed distributary plain phase channel sand bodies,A large area of distribution channel sand,It is the main purpose layer of polymer flooding.Through the effective characteristic,Combined with the microscopic and macroscopic aspects of the reservoir to analyze its influence factors,in which the pore structure is the core of microphysical research.Because of the remaining oil in the reservoir preservation condition is different,different types of micro pore structure of the remaining oil,the effective results are also different.There are still most of the remaining oil after polymer flooding,remaining in the reservoir pore.Therefore,the study of the micro-pore structure of the shape,classification and the relationship between micro-residual oil distribution,in-depth study of its influencing factors,and then put forward the corresponding increase in oil recovery and adjustment measures to become the late oil field to maintain oil field stability of one of the important issues,The paper draws the following conclusions:(1)The main factors influencing the performance of various types of wells are from the aspects of water,daily oil production,liquid production index and concentration of mining and so on.The main factors such as imperfect structure and micro-pore structure are as follows:macroscopic and microscopic factors.(2)Integrating various pore structure parameters,the microscopic pore structure in the study area is divided into five types,and the microscopic pore structure,injection parameters and permeability matching chart,on the basis of single well injection parameters for personalized design,can improve the reservoir to the use of the thickness of expanding the sweep volume reservoir.(3)Based on the analysis of the remaining oil formation mechanism,the micro-residual oil classification method was improved by experiment and combined with the actual data.The remaining oil is divided into intergranular,cluster,corner,throat,membranous five types,more conducive to guiding measures to tap the potential;(4)Quantitative description of micro-residual oil distribution from five types of pore structures from water flooding to polymer flooding.Through the oil displacement simulation,it is concluded that the change of the displacement direction can further improve the recovery rate,from the water flooding-polymer flooding,effectively expanding the spread of the volume.(5)The concentration of injection and injection concentration alternately in improving poor thin reservoir used to enhanced recovery efficiency at the same time,be able to save the polymer powder improve polymer flooding development effect.(6)Combined with the microstructure of the impact of the law and the remaining oil distribution,the development of appropriate adjustment measures,injection and adjustment to adjust the plate,measures technical specifications as a guide,the implementation of individual wells to optimize the individual optimization,early high and low speed,late enrichment speed,Expand the effect of volatility,improve the effect of polymer flooding to further tap the remaining oil.