Abstract
Polymer gels have attracted increasing interest as profile control agent to control water content and enhance oil recovery in heterogeneous reservoirs. However, retarding the gel crosslinking reaction of polymer and making it farther in the reservoir has become a difficulty in deep profile control. In this article, polyacrylamide with low degree of hydrolysis was prepared to react slowly with chromium ion to form gel, which was used for adjusting water injection profile. The microstructure of polymer gel was characterized using Fourier transform infrared spectroscopy and scanning electron microscopy. Core displacement experiments were used to evaluate the profile adjustment capability of polymer gels. It was found that the gel prepared by crosslinking the 5% polyacrylamide with chromium acetate can retard gelation time to 30 days in comparison with the conventional polymer gels when the polymer concentration reached to 1500 mg/L. The gel can form a regular spatial network which increases the viscosity from 80.2 to 6578 mPa · s. The results obtained by the core flooding experiment prove that the polymer gel has good profile control ability and further demonstrate the future potential of polymer gel to enhance oil recovery.
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