The flexibility analysis and improvement method for profile control using stratified water tubular in Jidong oilfield

Injection wells in Jidong oil field has the issues like deep well, inclined well, high temperature, high pressure, complex seperated injection tube and high operation charge. In order to ultilize the original seperated injection string safely to practice profile control, considering the problems such as string stuck, logging tools blocking and unable to sending and fishing exposed during profile control treatment, the reservior condition, tubular colume structure and production management have been analysed. The results show that the main reason is sand production, well open and shut frequently and profile control agent deposit and adhesion and the like. Based on analyzing the technology characteristics of stratified water tubular and profile control, this paper give the improvement measures invloving string exchange, profile technique optimizing and tighten up the management. The application has greatly raised the implementation success rate of profile control for the fixed tube in seperated injection wells, and consumedly lowered the work of operationand the charge.