Wu Zhongbao
Research Institute of Petroleum Exploration and Development, China
Title: The Research of Thansformation of Waterflooding Development Model in Super-low Permeability Oil Reservoirs
Biography
Biography: Wu Zhongbao
Abstract
Statement of the Problem: It is very difficult to buid effective displacment system for super-low permeability oil reservoirs through general fracturing and water injection,resulting in low oil production of single well,high ratio of uneffective waterflooding,low economic performance and so on,all of these show that the traditional waterflooding development model can’t fit economical and effective development of super-low permeability oil reservoirs. Methodology & Theoretical Orientation: According to the imbibition recovery mechanism, it is figure out that imbibition oil recovery rate has increased dramatically in magnitude after network fracturing in super-low permeability oil reservoirs , therefore,imbition oil recovery has changed from the subordinate effect into the donimant one in super-low permeability oil reservoirs . Futhermore, by Summing up the practice of many oil fields, some imbibition development model are proposed ,such as waterflood huff and puff, asynchronous injection and production, exchanging between production wells and injection wells.Findings: An brand-new comprehensive development model "network fracturing + imbibition oil recovery " is created,this model is already applied in some oil fields in china and the effect of preliminary implementation is remarkable,it is estimated that the final recovery efficiency of the reservoirs can by increased by over 10%. Conclusion & Significance:The new development model holds important popularization and application foreground and will take more and more important effect on low permeability oil reservoir development.