Study On Movable Gel Profiling/Flooding System Optimization At Boundary Temperature

65-75 degrees C is the boundary temperature of phenol-formaldehyde resin and organic chrome crosslink with HPAM to generate movable gel. Generally speaking, when the reservoir temperature is below 65-75 degrees C, the crosslinking agent is Organic chrome. Phenol-formaldehyde resin is used when the temperature is above 65-75 degrees C. In this paper the gelation properties of phenol-formaldehyde resin and organic chrome were compared at 70 degrees C. The experiment results showed that the crosslinking time of phenol-formaldehyde resin gel was longer and more conducive to field injection. In addition the phenol-formaldehyde resin gel had greater viscosity, adhesion and shearing resistance compared with the organic chrome gel. So the phenol-formaldehyde resin was chosen for further optimization The crosslinking time was shortened and the gel viscosity increased with the increase of the polymer concentration. As the polymer crosslinker proportion increased The crosslinking time was shortened and the gel viscosity increased first and then decreased. Reinforcer NC and stabilizer WG were added to improve the temperature and salt tolerance of the gel. The gel formula suitable for the boundary temperature was obtained. The optimum polymer concentration is 1200mg/L, the polymer crosslinker proportion is 1:1.1, the best reinforcer concentration is 400mg/L and the concentration of the stabilizer is 150mg/L. The crosslinking time is 31h, the gel viscosity is above 2100mPa.s. The gel did not shrink and no water separation was observed at 70 degrees C for 150 days. The viscosity retention rate was more than 70%.