Development and characterization of self-healing gel temporary plugging agent for well killing

A new type of self-healing gel was developed by using acrylamide (AM) and other materials, and the effects of the content of PEGDA200 and PEGDA400 on the mechanical properties of gel were compared. The results showed that adding PEGDA200 and PEGDA400 to the self-repairing gel significantly improved the performance of the composite gel. When the content of PEGDA200 in the gel was 0.2%, the rheological property after repair was 109.4% of that before repair, the compressive property after repair was 95.2% of that before repair, the adhesive property was increased by 36.8%, and the compressive strength after repair was 92.4% of that before repair. When the content of PEGDA400 in gel was 0.2%, the rheological property of gel after repair was 105.8% of that before repair, the maximum adhesion could be increased by 17.8%.