Study of Depth Profile Control by Swellable Pre-crosslinking Particle Gel

The sellable pre-cross linking particle gel is a kind of surface cross linking pre-polymer, of which the effects of several important factors like temperature, salinity and the pH values on its swellable performance, visco-elasticity, thermal stability and enhanced oil recovery ratio were firstly evaluated. Then the NMR, an advanced visible technology, was used to represent the oil and water distribution laws in different core displacement processes by water, polymer and the swellable particle gel. The results show that the depth profile control agent used in this study has great strength, excellent salt resistance and thermal stability, and controllable particle radius, swelling rate and ratio. It can deviate the water flow direction at the high permeability formation to displace much of the remaining oil at the low permeability reservoirs.