Study On High Temperature And High Salt Profile Control System

In the mining of high-temperature and high-salt reservoirs,polyacrylamide and partially hydrolyzed polyacrylamide have poor temperature and salt tolerance,and it is urgent to develop a jelly system that can be used under high temperature and high salt conditions.In this paper,the effect of AMPS content and molecular weight on the temperature and salt resistance of the polymer in AM/AMPS binary copolymer was studied.The results show that the copolymer of the same molecular weight and the binary copolymer with high AMPS content have good temperature and salt resistance.The copolymer having the same AMPS content and the binary copolymer having a large molecular weight have good temperature and salt resistance.The AM/AMPS binary polymer-polyethyleneimine crosslinked jelly formulation system was optimized at a temperature of 90 °C-120 °C with a salinity of 51727 mg/L and 115193mg/L.As the temperature increases,the gelation time of the polyethyleneimine cross-linked gel is reduced,and the gelation time of the gel becomes longer as the salinity increases.The stability of the polyethyleneimine crosslinked jelly at a temperature between 90 ° C and 120 °C is good.The AM/AMPS binary copolymer was used as the cross-linking polymer for gelation.The gelation time,gel strength and stability were used as indicators to develop a series of jelly formulations of phenolic cross-linking system,and the temperature was preferably90 °C-120 °C,the mineralization degree of 51,727 mg/L and 115,193 mg/L of the polymer in the different conditions of the AMPS content,so that the system can be stable for 180 days and the amount of dehydration is less than 20%.The effects of temperature,salinity,crosslinker,catalyst,auxiliary agent and AMPS content in AM/AMPS binary copolymer on the performance of phenolic gel were investi Cated.The results show: As the temperature increases,the gelation time of the jelly decreases,and the long-term thermal stability of the gel deteriorates.To maintain the same gel performance,it is necessary to use a polymer with a larger molecular weight to reduce the amount of the crosslinking agent and the catalyst.As the degree of mineralization increases,the gelation time becomes longer and the long-term stability of the gel becomes worse.To maintain the same gel performance,it is necessary to increase the content of AMPS in the polymer.