Abstract: Shengtuo oifield is characterized by complex geology with high temperature and high salinity, This paper works oul polymer molecule, selects proper polymer. croSs-linking agent, cross-linking acelaranl and inorganic proppant, synthesizes a new teniperature-resistant brine-tolerant pre-.ross linking swelling system, finally, optimizes the formulation of pre-cross linking swelling syslem by using orthogonalizing process. Results show that the synthetic sweling system has the characteristics of temperature resistance (120C). brine tolerancc (1.8x10+mg/ L), high intensity, intensive adsorption, good thermal and chemical stabilities. Field pilot test indicates that the slimulation response using this swelling system for profile control is positive.

Key words: Shengtuo oilfield, chemical water plugging, chemical injection, thernal slability, brine resistant property