The Research Of Deep Profiel Technology Of Wangyao District, Ansai Oilfield

After more than20years development of water-flooding, reservoir pore structure and permeability of Ansai Oilfield has undergone great changes. The tradiction between the layers or in the layer is further exacerbated. High permeability or the seepage advantage channels are come into being.The situation of water flooding and the distribution of remaining oil have becom eincreasingly complex. It is becoming increasingly difficult to keep a stable productivity.It not only greatly affect the degree of recovery of crude oil, but also increased the cost of oil production. The water channel or high permeability sandstone formation must be blocked for enhancing oil recovery.Deep profile control technology as an effective means to reduce the well water content and enhanced oil recovery, has become the key to sustainable development of this hundred million ton-old oilfield.In this paper, Wangyao is the object of the study. After the research of the status of profile control technology studies and application at home and abroad,and the comprehensive study of reservoir characteristics and the developing dynamic, profile control agents have been preferred and evaluated through laboratory experiments,eventually filter out two suitable profile control systems:amphion weak gel profile control agent and the flexible slow expansion particle for high-salinity reservoirs.More representative and practical significance for the study,two injection wells of this block have been selected to make field pilot test, and good results have been achieved.