POLYMER-FLY ASH COMBINATION PROFILE CONTROLLING TECHNOLOGY IN BAMIANHE OILFIELD

Polyacrylamide has easy hydration in water, large scale of adsorption in formation, and poor shearing stability and thermal stability, etc., and to solve these problems, the assisting agent eposide resin is added into polyacrylamide, which improves the shearing and thermal stability dramatically and reduces its adsorption, while increases the polymer volume for throat plugging. The crosslinking agent screen out with high crosslinking capability forms solid network polymer of high strength, which solves the problem of stable application of polyacrylamide system. Fly ash was optimized as the crosslinking medium in accordance with the geological and reservoir conditions of Bamianhe Oilfield, and field using showed that the gelled polymer-fly ash system is especially suitable for profile controlling in fractured reservoirs with large pores and throats and of high permeability.