Research On Deep Profile Control Technology In The Super High Water Content Stage Of Block S Of Daqing Oilfield

With the development of water injection in most oilfields in China,the average water content of oil reservoir is increasing and the economic benefit is decreasing.Therefore,it is necessary to take measures to increase oil production in time.In a short period of time,it is of great significance to develop a method that can expand the sweep volume economically and effectively and improve the efficiency of oil displacement,and solve the current situation of high water content in a large area of oil reservoir.In recent years,chemical water plugging and profile control technology has become one of the effective means to improve the development effect and achieve stable production of the reservoir,which can fundamentally improve the high water content problem of the reservoir.The N1 block is located in the south of S Development Zone of Daqing Oilfield.After summarizing the development history of N1 block and analyzing the injection and production status in the later stage of polymer flooding,several major problems appeared,including unbalanced production of vertical profile,uneven distribution of water content,serious inefficient and invalid circulation,and difficult to control thick oil layer.In order to solve these problems,this paper proposes to use profile control technology to control injection wells and production wells respectively.Through the screening of the basic data in each area,the PI21 and PI22 oil layers in the South and northwest parts of the N1 block are identified as the main profile control areas.Three kinds of profile control systems applied to injection wells are proposed,including gel profile control agent system,gel and particle composite profile control system,modified asphalt particle profile control system and a profile control system applied to the production wells,that is,punctual glue plugging.Agent system,followed by a detailed performance evaluation of the four profile control systems in the laboratory,the results show that each of the four systems has advantages and all meet the requirements,which can achieve the expected effect of improving the reservoir.Finally,a profile control injection scheme is designed to distribute the above four profile control systems in each well of N1 block,and calculate the detailed slug size,injection concentration,chemical agent consumption and other data.These injection schemes will be applied in the field test of N1 block in the next step.In this project,the development effect analysis and profile control scheme design of block N1 shows the problems that the block is facing,and give a feasible scheme.This project is not only a method to solve the problem of high water cut in block N1,but also a pilot experiment to carry out reservoir transformation in other blocks,which plays an important role in the further development of Daqing Oilfield and the realization of high and stable production.