THE STUDY OF THE CHARACTERISTY OF WEAK GEL IN THE CORE TEST

A kind of profile modification technology using weak gel in depth-treatment of injection well is introduced. The polymer solution which concentration is approaching to that of polymer flooding and the delayed crosslinking agent whose concentration is low are injected to the formation to crosslink slowly. The technology combines that of the polymer flooding and the uniform profile modification. The character of weak gel and mechanism of its action are introduced, and the characteristic behavior of weak gel in core flooding is also discussed,including the character to shift for formed weak gel in the core, and the character of the weak gel in the core after water displacement and its selective profile modification, and the total effect of displacement using two parallel core. The results show that the weak gel can shift in the core; and has good selectivity in permeability,which prefers to enter high permeability areas rather than low permeability areas; and the weak gel has good effect in EOR.