Authors:
S. G. Zhu
1
;
F. S. Wang
1
;
D. K. Xu
1
;
C. J. Liu
1
;
Q. Z. Li
1
;
X. L. Song
1
;
Q. Ma
1
;
H. C. Li
1
;
L. J. Wang
1
;
P. Li
2
;
P. F. Tang
3
and
G. L. Gao
1
Affiliations:
1
Production and Engineering Research Institute Daqing oilfield Limited liability company, China
;
2
No.4 Oil Production Plant of Daqing Oilfield Co. Ltd, China
;
3
No.6 Oil Production Plant of Daqing Oilfield Co. Ltd, China
Keyword(s):
low viscosity loss pressure regulator;the molecular weight regulator;chemical flooding;the whole process of integration points
Abstract:
Injection technology for water flooding points exist at the polymer solution flowing through the injection allocation generated when mechanical degradation,big viscosity loss need to inject (over 30%) and low permeable reservoirs with low relative molecular mass of polymer solution, in order to make sure no problem such as block reservoir.Chemical flooding process is studied in the integration of hierarchical points injection technology,designed the low viscosity loss high throttling pressure regulator, wide adjusting range low molecular weight and regulator of the choke points and the whole process of the integration of eccentric injection allocation, layered injection and dual regulation of relative molecular mass.Hydraulic characteristics, laboratory test results show that within the scope of the flow rate of 70 m3/d, viscosity loss rate has dropped from 30% to 10%, and separate injection technology compatible with water flooding, injection string meet blank water flooding, separa
te chemical flooding and subsequent water flooding process need, reduce the investment and production cost, is the application of more than 3000 Wells.Field test results show that 2-3 interval cast get success rate of 95.6%, a 95% success rate increase.Statistics a layered polymer injection blocks, separate injection Wells using layer is 9.8% higher than general Wells, the thickness of use increased by 10.3%.
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