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The effect and analysis on Cr 3+ gel improving profile control in alkalescent alkaline/surfactant/polymer flooding
Author(s) -
Lu Xiangguo,
Zhao Lanlan,
Zhang Ke
Publication year - 2009
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.29804
Subject(s) - pulmonary surfactant , polymer , scaling , permeability (electromagnetism) , chemical engineering , wellbore , materials science , chromatography , clearance , petroleum engineering , chemistry , membrane , composite material , geology , engineering , mathematics , medicine , urology , biochemistry , geometry
The emulsification of produced fluid and the scaling along production system have always been one of the most difficult problems in NaOH/surfactant/polymer flooding. To decrease those influences on production, the pilot test of Na 2 CO 3 /surfactant/polymer flooding was developed in Daqing Oilfield. The results show fluid emulsification and scaling of production system were prevented effectively, but scaling along the injection system appeared and reservoir heterogeneity was aggravated. This is becoming a new technical problem. By analyzing scaling mechanism and the property of profile control agent, the author presents a technical solution that using Cr 3+ polymer gel is improving fluid entry profile of injection well in Na 2 CO 3 /surfactant/polymer flooding. Optimization of formula and evaluation of its property and its compatibility with Na 2 CO 3 /surfactant/polymer flooding system were investigated and a pilot test was conducted in well B2‐1‐P56 of Daqing Oilfield. The results shows polymer gel has dual function, i.e., removing scale and plugging off high permeability zone. The scale in the instrument of injection, pipes and wellside of wellbore is thoroughly cleared up. The fluid entry into high permeability layer is decreased from 100 to 64.9%, and fluid entry in low and intermediate permeability layer is increased from 0 to 35.1%. The profile control of injection well is effectively improved. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009