Abstract
Temporary abandonment of oil wells requires isolation protocols to ensure safety of the environment and operators, for subsequent reactivation. For this, barrier materials are used to prevent influx of fluids from the rock formation to the wellbore. Polymeric gels are a promising alternative due to their ability to form a three-dimensional structure in situ with adequate elastic properties. With this goal, solid-free gels of hydrolyzed polyacrylamide and polyethyleneimine with glycerol as reinforcement material were developed. Furthermore, diethylenetriamine and diethanolamine were added to the formulations as anti-syneresis agents. The gelation kinetics and gels stability were evaluated through bottle tests and rheological measurements. The increase in glycerol content combined with DETA and DEA in the gels resulted in a reduction of gelation time varying according to the concentration of anti-syneresis agents added. This combination also enabled the increase on thermal stability of the gels with significant delay of 110% in the syneresis time. Furthermore, the storage and loss modulus and tan delta results showed that the new HPAM-PEI-Glycerol-DETA/DEA gel formulation had superior elastic properties compared to the HPAM-PEI gel.
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