Preparation and Evaluation of Novel High Temperature Resistance Water Shutoff Agent

A kind of novel high temperature resistance water shutoff agent with high viscosity was synthesized using sulfonated tannin extract as main agent, paraformaldehyde as crosslinking agent, polyhydric phenol as stabilizer, urea as tackifier. Then the effects of amout of the components, pH and salinity on the gel performance of water shutoff agent were determined. The results have show that the gelling time and strength of resulting products are 48 h and 78 KPa under the conditions of sulfonated tannin extract 10 g, hydroquinone 3 g, paraformaldehyde 1.2 g, urea 1.4 g, pH = 7, salinity of 3000 mg/L, according with the demand of fieldwork.