Controlling gelation time of in situ polymerization of gel system through AGET ATRP principle
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To better control the gelation time of in situ polymerization of gel system in reservoir, an activator regenerated by AGET (activator generated by electron transfer) ATRP (atom transfer radical polymerization) initiating system was developed. The AGET ATRP initiating system was composed of an initiator 1,2-dibromoethane, a catalyst ferric chloride and a reducing agent vitamin C, and the effects of these three component proportions on the gelation time and gel viscosity were systematically investigated. Results of bottle tests indicated that the gelation time can even be more than 20 h at 60 °C at optimal concentration ratios. Moreover, the viscosity decreased and the gelation time increased with the increase of salinity and temperature. The gelation time of the core test was 1.5 times or even longer in comparison with that of the bottle test owing to the influences of dilution, adsorption, and rock skeleton isolation. It was also confirmed that the AGET ATRP initiating system can initiate the cross-link gelation of monomers in the core. The enhanced oil recovery result indicated that the oil recovery increased by 9.17% after the gelation of the gelling solutions, and final oil recovery was 40.05%. This research provided a brand-new method to control the gelation time of the in situ polymerization of gel system.
KeywordsLow permeability reservoir Deep profile control In situ polymerization Gelation time AGET ATRP initiating system
This work was supported by the National Science and Technology Major Projects (Grant No. 2017ZX05009-004 and Grant No. 2016ZX05050012) and National Natural Science Foundation of China (Grant No. 51334007).
Compliance with ethical standards
Conflict of interest
The authors declare no competing financial interest.
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