Sulige gas field is a typical tight-gas reservoir whose ultralow permeability comes to a problem to a noble stimulation technology with its name refracturing coupling with SRV fracturing

owing to the failure of injection by conventional plugging agent

which aims to plug existing fractures and create more multistage fractures. So we designed the novel supermolecule temporary plugging agent--DMF and conducted a series of tests including gelling

break gelling

and temporary plugging steering. The results had demonstrated that the new plugging agent DMF was responded to high temperature

about 100 ~ 110℃

transforming into high viscosity supramolecular gel from low viscosity liquid at low or normal temperature

plugging existing fractures. When the temperature got higher

the gel of DMF turned into liquid automatically. Then

the DMF showed a better performance（122.92 MPa/m） of temporary plugging steering than that of conventional plugging agent

demonstrating a more desirable diversion agent for tight-gas reservoirs.