Patent ID: 11912932
Assignee: CHINA UNIVERSITY OF PETROLEUM (EAST CHINA)
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  Y | IPC C  E

Claim 4:
5. The encapsulated polymer flooding method for enhancing oil recovery according to claim 1, wherein in the step (v), the injection scheme for the encapsulated polymer flooding field comprises:
first, injecting an encapsulated polymer 0.1PV at a concentration of c1 at an injection rate Q1 satisfying, α
     (
     
      
       A
       ⁢
       ϕ
       ⁢
       
        x
        1
       
      
      
       2
       ⁢
       
        Q
        1
       
      
     
     )
    
    n
   
   <
   
    0
    .
    3
   
  
  ,
 

 A being the cross-sectional area of the formation, and ϕ being the porosity of the near-wellbore targeted profile control area;
then, injecting an encapsulated polymer 0.4PV at a concentration of 0.5c1 at an injection rate Q2 satisfying, 0
    .
    3
   
   <
   
    
     α
     (
     
      
       A
       ⁢
       ϕ
       ⁢
       
        x
        2
       
      
      
       2
       ⁢
       
        Q
        2
       
      
     
     )
    
    n
   
   <
   0.85
  
  ;
  and
 

finally, performing water flooding.